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IMPORTANT SAFETY NOTICE
Proper service and repair is important to the safe, reliable operation of all Philips Consumer Electronics Company** Equipment. The service procedures recommended by Philips and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended. It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Philips could not possibly know, evaluate and advise the service trade of all conceivable ways in which service might be done, or of the possible hazardous consequences of each way. Consequently, Philips has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Philips must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected. ** Hereafter throughout this manual, Philips Consumer Electronics Company will be referred to as Philips.
WARNING
Critical components having special safety characteristics are identified with a or "S" by the Ref. No. in the parts list and enclosed within a broken line* (where several critical components are grouped in one area) along with the safety symbol on the schematics or exploded views. Use of substitute replacement parts which do not have the same specified safety characteristics may create shock, fire, or other hazards. Under no circumstances should the original design be modified or altered without written permission from Philips. Philips assumes no liability, express or implied, arising out of any unauthorized modification of design. Servicer assumes all liability. * Broken Line ____ _ ____ _ ____ _ ____
FIRE AND SHOCK HAZARD
1. Be sure all components are positioned in such a way as to avoid the possibility of adjacent component shorts. This is especially important on those chassis which are transported to and from the service shop. 2. Never release a repaired unit unless all protective devices such as insulators, barriers, covers, strain reliefs, and other hardware have been installed in accordance with the original design. 3. Soldering and wiring must be inspected to locate possible cold solder joints, solder splashes, sharp solder points, frayed leads, pinched leads, or damaged insulation (including the ac cord). Be certain to remove loose solder balls and all other loose foreign particles. 4. Check across-the-line components and other components for physical evidence of damage or deterioration and replace if necessary. Follow original layout, lead length, and dress. 5. No lead or component should touch a receiving tube or a resistor rated at 1 watt or more. Lead tension around protruding metal surfaces or edges must be avoided. 6. Critical components having special safety characteristics are identified with an 'S' by the Ref. No. in the parts list and enclosed within a broken line* (where several critical components are grouped in one area) along with the safety symbol on the schematic diagrams and /or exploded views.
7. When servicing any unit, always use a separate isolation transformer for the chassis. Failure to use a separate isolation transformer may expose you to possible shock hazard, and may cause damage to servicing instruments. 8. Many electronic products use a polarized ac line cord (one wide pin on the plug). Defeating this safety feature may create a potential hazard to the servicer and the user. Extension cords which do not incorporate the polarizing feature should never be used. 9. After reassembly of the unit, always perform an ac leakage test or resistance test from the line cord to all exposed metal parts of the cabinet. Also, check all metal control shafts (with knobs removed), antenna terminals, handles, screws, etc., to be sure the unit may be safely operated without danger of electrical shock. * Broken line ____ _ ____ _ ____ _ ____
LEAKAGE CURRENT COLD CHECK
1. Unplug the ac line cord and connect a jumper between the two prongs of the plug. 2. Turn on the power switch. 3. Measure the resistance value between the jumpered ac plug and all exposed cabinet parts of the receiver, such as screw heads, antennas, and control shafts. When the exposed metallic part has a return path to the chassis, the reading should be between 1 megohm and 5.2 megohms. When the exposed metal does not have a return path to the chassis, the reading must be infinity. Remove the jumper from the ac line cord.
LEAKAGE CURRENT HOT CHECK
1. Do not use an isolation transformer for this test. Plug the completely reassembled receiver directly into the ac outlet. 2. Connect a 1.5k, 10W resistor paralleled by a 0.15uF. capacitor between each exposed metallic cabinet part and a good earth ground such as a water pipe, as shown below. 3. Use an ac voltmeter with at least 5000 ohms/volt sensitivity to measure the potential across the resistor. 4. The potential at any point should not exceed 0.75 volts. A leakage current tester may be used to make this test; leakage current must not exceed 0.5mA. If a measurement is outside of the specified limits, there is a possibility of shock hazard. The receiver should be repaired and rechecked before returning it to the customer. 5. Repeat the above procedure with the ac plug reversed. (Note: An ac adapter is necessary when a polarized plug is used. Do not defeat the polarizing feature of the plug.)
OR
With the instrument completely reassembled, plug the ac line cord directly into a 120Vac outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument ac switch first in the on position and then in the off position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5mA. Reverse the instrument power cord plug in the outlet and repeat the test. See the graphic below.
TV SAFETY NOTES
SAFETY CHECKS
After the original service problem has been corrected, a complete safety check should be made. Be sure to check over the entire set, not just the areas where you have worked. Some previous servicer may have left an unsafe condition, which could be unknowingly passed on to your customer. Be sure to check all of the following: Fire and Shock Hazard Implosion X-Radiation Leakage Current Cold Check Leakage Current Hot Check Picture Tube Replacement Parts Replacement WARNING: Before removing the CRT anode cap, turn the unit OFF and short the HIGH VOLTAGE to the CRT DAG ground. SERVICE NOTE: The CRT DAG is not at chassis ground.
IMPLOSION
1. All picture tubes used in current model receivers are equipped with an integral implosion system. Care should always be used, and safety glasses worn, whenever handling any picture tube. Avoid scratching or otherwise damaging the picture tube during installation. 2. Use only replacement tubes specified by the manufacturer.
X-RADIATION
1. Be sure procedures and instructions to all your service personnel cover the subject of X-radiation. Potential sources of X-rays in TV receivers are the picture tube and the high voltage circuits. The basic precaution which must be exercised is to keep the high voltage at the factory recommended level. 2. To avoid possible exposure to X-radiation and electrical shock, only the manufacturer's specified anode connectors must be used. 3. It is essential that the service technician has an accurate HV meter available at all times. The calibration of this meter should be checked periodically against a reference standard. 4. When the HV circuitry is operating properly there is no possibility of an X-radiation problem. High voltage should always be kept at the manufacturer's rated value - no higher - for optimum performance. Every time a color set is serviced, the brightness should be run up and down while monitoring the HV with a meter to be certain that the HV is regulated correctly and does not exceed the specified value. We suggest that you and your technicians review test procedures so that HV and HV regulation are always checked as a standard servicing procedure, and the reason for this prudent routine is clearly understood by everyone. It is important to use an accurate and reliable HV meter. It is recommended that the HV reading be recorded on each customer's invoice, which will demonstrate a proper concern for the customer's safety.
5. When troubleshooting and making test measurements in a receiver with a problem of excessive high voltage, reduce the line voltage by means of a Variac to bring the HV into acceptable limits while troubleshooting. Do not operate the chassis longer than necessary to locate the cause of the excessive HV. 6. New picture tubes are specifically designed to withstand higher operating voltages without creating undesirable X-radiation. It is strongly recommended that any shop test fixture which is to be used with the new higher voltage chassis be equipped with one of the new type tubes designed for this service. Addition of a permanently connected HV meter to the shop test fixture is advisable. The CRT types used in these new sets should never be replaced with any other types, as this may result in excessive X-radiation. 7. It is essential to use the specified picture tube to avoid a possible X-radiation problem. 8. Most TV receivers contain some type of emergency "Hold Down" circuit to prevent HV from rising to excessive levels in the presence of a failure mode. These various circuits should be understood by all technicians servicing them, especially since many hold down circuits are inoperative as long as the receiver performs normally.
PICTURE TUBE REPLACEMENT
The primary source of X-radiation in this television receiver is the picture tube. The picture tube utilized in this chassis is specially constructed to limit X-radiation emissions. For continued Xradiation protection, the replacement tube must be the same type as the original, including suffix letter, or a Philips approved type.
PARTS REPLACEMENT
Many electrical and mechanical parts in Philips television sets have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. The use of a substitute part which does not have the same safety characteristics as the Philips recommended replacement part shown in this service manual may create shock, fire, or other hazards.
PRODUCT SAFETY GUIDELINES FOR ALL PRODUCTS
CAUTION: Do not modify any circuit. Service work should be performed only after you are thoroughly familiar with all of the following safety checks. Risk of potential hazards and injury to the user increases if safety checks are not adhered to. USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING.
PREVENTION OF ELECTROSTATIC DISCHARGE (ESD)
Some semiconductor solid state devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices, Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electrostatic discharge (ESD). 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as "antistatic (ESD protected)" can generate an electrical charge sufficient to damage ES devices. 5. Do not use Freon propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it (most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your feet from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device.)
NOTE to CATV system Installer: This reminder is provided to call the CATV system installer's attention to article 820-22 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical.
PRACTICAL SERVICE PRECAUTIONS
IT MAKES SENSE TO AVOID EXPOSURE TO ELECTRICAL SHOCK. While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard. ALWAYS RESPECT VOLTAGES. While some may not be dangerous in themselves, they can cause unexpected reactions reactions that are best avoided. Before reaching into the powered color TV set, it is best to test the high voltage insulation. It is easy to do, and is just a good service precaution. BEFORE POWERING UP THE TV WITH THE BACK OFF (or on a test fixture), attach a clip lead to the CRT DAG ground and to a screwdriver blade that has a well insulated handle. After the TV is powered on and high voltage has developed, probe the anode lead with the blade, starting at the bottom of the High Voltage Transformer (flyback IFT). Move the blade to within two inches of the connector of the CRT. IF THERE IS AN ARC, YOU FOUND IT THE EASY WAY, WITHOUT GETTING A SHOCK! If there is an arc to the screwdriver blade, replace the High Voltage Transformer or the lead, (if removable) whichever is causing the problem.
PICTURE TUBE REPLACEMENT PROCEDURE
Note: a. b. c. Two (2) people are required to handle this picture tube. Safety Glasses must be worn during this procedure or whenever directly handling a picture tube. Take care in each step not to damage the CRT or the cabinet.
1. Remove the Chassis and the CRT Socket Board Module from the cabinet. 2. A furniture pad or blanket should be positioned on the floor to support only the CRT Face. This pad or blanket should be high enough to keep the CRT Face approximately 12 to 14 inches off the floor. 3. Using two people, place the cabinet in a front down position with the CRT Face on the pad or blanket. 4. Place padded blocks under each corner of the cabinet to keep it from rocking. 5. Remove the four screws, at the corners of the CRT. 6. With two people lowering the cabinet to the floor, leave the CRT elevated by the pad or blanket. Note: Take care not to grasp the neck of the CRT during this procedure, as it is extremely fragile. 7. Two (2) people may then lift the CRT from the cabinet. 8. Remove the degaussing coil from the defective CRT and mount on the replacement. Take care to maintain the exact shape and fit. To install the new CRT, reverse steps 1 to 7.
MODEL TO CHASSIS LIST
Model 9P5031 9P5034 9P5531 9P5534 9P6031 9P6034 9P6034 9P5511 9P5044 9P5544 9P6044 9P6444 50YP43 55YP43 60YP43 50YP44 55YP44 60YP44 9P5040 9P6040 9P5540 9P6440 50YP45 55YP45 50PP73 55PP73 60PP73 PV5571 PV6071 60P927 64P927 55P927 Chassis Reference PTV835 PTV835 PTV835 PTV835 PTV835 PTV835 PTV835 PTV836 PTV840 PTV840 PTV840 PTV840 PTV841 PTV841 PTV841 PTV842 PTV842 PTV842 PTV843 PTV843 PTV843 PTV843 PTV844 PTV844 PTV847 PTV847 PTV847 PTV853 PTV853 PTV855 PTV855 PTV855 Screen Size and Brand 50" Philips/Magnavox 50" Philips/Magnavox 55" Philips/Magnavox 55" Philips/Magnavox 60" Philips/Magnavox 60" Philips/Magnavox 60" Philips/Magnavox 55" Philips/Magnavox 50" Philips/Magnavox 55" Philips/Magnavox 60" Philips/Magnavox 64" Philips/Magnavox 50" Philips Latam 55" Philips Latam 60" Philips Latam 50" Philips Korea 55" Philips Korea 60" Philips Korea 50" Sear/Philips 60" Sear/Philips 55" Sear/Philips 64" Sear/Philips 50" 55" 50" Philips Brazil 55" Philips Brazil 60" Philips Brazil Marantz Marantz Statement Statement Statement
Cabinet Replacement Parts List
For the most current Cabinet Replacement Part numbers, type the component ID number from the exploded view while viewing the exploded view or schematic. If a list of all cabinet replacement parts for all models is desired, click "CBA/Acc. Parts" while viewing the parts list. A list of these parts can then be printed.
OPTICAL ASSEMBLY REPLACEMENT PARTS LIST
For the most current Optical Assembly Replacement Parts, type the component ID number from the exploded view while viewing the exploded view or schematic.
MODEL TO PANEL LIST
For the most current Mode to Panel list, type "CBA" while viewing the exploded view or schematic. If a list of all modules/panels for all models is desired, click "CBA/Acc. Parts" while viewing the parts list. A list of these parts can then be printed.
Remote Cross Reference
For the most current list of remote control part numbers, type "remote" while viewing the exploded view or schematic. If a list of all remotes for all models is desired, click "CBA/Acc. Parts" while viewing the parts list. A list of these parts can then be printed.
50YP43 50YP44 55P916 55P927 55YP43 55YP44 60P916 60P927 60YP43 64P916 64P927 9P5031 9P5034 9P5040 9P5044 9P5511 9P5514 9P5531 9P5534 9P5540 9P5544 9P6031 9P6034 9P6040 9P6044 9P6440 9P6444 PV5571 PV6071 313501703811 313501703751 310420709390 310420709390 313501703811 313501703751 310420709390 310420709390 313501703811 310420709390 310420709390 313501703801 313501703801 312124791381 313501703791 313501701681 313501701681 313501703801 313501703801 312124791381 313501703791 313501703801 313501703801 312124791381 313501703791 312124791381 313501703791 312124791321 312124791321 H179ME-AA01 H149ME-AA01 RC2011 RC2011 H179ME-AA01 H149ME-AA01 RC2011 RC2011 H179ME-AA01 RC2011 RC2011 Y149SB-AA01 Y149SB-AA01 Y149SE Y149GE-AA01 T207NG-PM01 T207NG-PM01 Y149SB-AA01 Y149SB-AA01 Y149SE Y149GE-AA01 Y149SB-AA01 Y149SB-AA01 Y149SE Y149GE-AA01 Y149SE Y149GE-AA01 Z149CE Z149CE
TELEVISION AND REMOTE OPERATION
Model 9P5031 9P5034 9P5511 9P5514 9P5531 9P5534 9P6031 9P6034-C1 9P6034-91 9P5040 9P5044 50YP43 50YP44 50PP73 9P5540 9P5544 55YP43 55YP44 55PP73 9P6040 9P6044 60YP43 60YP44 60PP73 9P6440 9P6444 60P927 64P927 PV5571 PV6071 55P927 Remote Y149SB Y149SB T209NG T209NG Y149SB Y149SB Y149SB Y149SB Y149SB UR614SB Y149GE H179ME H149ME UR617KD UR614SB Y149GE H179ME H149ME UR617KD UR614SB Y149GE H179ME H149ME UR617KD UR614SB Y149GE RC2011 RC2011 Z149CE Z149CE RC2011
Jack Panel Layouts
This diagram for the following chassis / models: PTV835 9P5031 9P5034 9P5531 9P5534 9P6031 9P6034-C1 9P6034-91
This diagram for the following chassis / models:
PTV840
9P5044 9P5544 9P6044 9P6444
PTV842
50YP44 55YP44 60YP44
PTV843
9P5040 9P6040 9P5540 9P6440
PTV841
50YP43 55YP43 60YP43
PTV847
50PP73 55PP73 60PP73
This diagram for the following chassis / models:
PTV853
PV5571 PV6071
PTV855
60P927 64P927 55P927
9P5031 - 9P5034 - 9P5531 - 9P5534 - 9P6031 - 9P6034-C1 - 9P6034-91
9P5511 - 9P5514
9P5040 - 9P5540 - 9P6040 - 9P6440
9P5044 - 50YP44 - 9P5544 - 55YP44 - 9P6044 - 60YP44 - 9P6444
50YP43 - 50PP73 - 55YP43 - 55PP73 - 60YP43 - 60PP73
60P927 - 64P927 - 55P927
PV5571 - PV6071
SERVICE ADJUSTMENTS
PTV 830-865 Chassis GR9D Chassis
The Large Signal Panel incorporates a "hot" ground system. Always use a separate isolation transformer when applying power to the exposed chassis.
Service Adjustment Notes
Unless otherwise specified: 1. All service adjustments are "hot" voltagewise. For maximum safety, ensure the use of properly insulated tools. 2. Many of the following adjustments are made through software intervention. The user remote control transmitter is required in order to modify register values stored within the EEPROM IC on the Main Chassis Board Assembly. 3. Grid locations (e.g., D-2) next to control reference numbers refer to PC board zone locations.
On-screen Oscillator Setup
1. Turn the set on and tune to a broadcast television signal. 2. Connect a digital voltmeter to F041 (Positive side of capacitor 2387) on the Small Signal Panel. 3. Adjust 2341 (zone E-6) to obtain a reading of 2.5Vdc (0.1V) on the meter. Note: This adjustment may affect onscreen menu positioning or other graphics generated by the set. Refer to "Modifying Factory Default Values" and the contents of DAC registers 22 and 23 for vertical and horizontal positioning of the onscreen display (OSD).
RF AGC Delay (Small Signal Panels ASG059, ASG060, ASG061, ASG062, ASG063)
Tuner 1 Note: This control (3202) is located on the Small Signal Panel in zone area J-2. 1. Tune to a weak station, or loosely couple the antenna to observe a snowy picture. 2. Set the RF AGC Delay Control (3202) to its fully counterclockwise (CCW) position. 3. Slowly advance 3202 clockwise (CW) to a point slightly beyond the point of minimum snow. Note: Do not advance the control beyond this point, as it may result in an overloaded picture on the face of the CRTs (caused by a strong signal from local station). The range of the AGC voltage supplied to pin 1 of 1900 (see F003) of the Varactor Tuner will vary from approximately 4.2Vdc (without signal) to about 1.87Vdc (RF signal of 10mV).
Tuner 2 Note: This control (3256) is located on the Small Signal Panel in zone area K-5.
1. Tune to a weak station, or loosely couple the antenna to observe a snowy picture. 2. Set the RF AGC Delay Control (3256) to its fully counterclockwise (CCW) position. 3. Slowly advance 3256 clockwise (CW) to a point slightly beyond the point of minimum snow. Note: Do not advance the control beyond this point, as it may result in an overloaded picture on the face of the CRTs (caused by a strong signal from local station). The range of the AGC voltage supplied to pin 1 of 1900 (see F005) of the Varactor Tuner will vary from approximately 4.2Vdc (without signal) to about 1.87Vdc (RF signal of 10mV).
VCO and AFT Adjustment (Small Signal Panels ASG059, ASG060, ASG061, ASG062,
ASG063) Tuner 1 1. Cut the shield breakpoints around 7200 and the IF circuitry (see zone K-2). Remove the top cover of the shield to gain access to the internal circuitry. 2. Short circuit test points F016 and F017 (pins 1 and 2 of 7200). 3. Short circuit test point F023 (pin 13 of 7200) to ground (the shield around 7200 is a convenient ground). 4. Connect a DC voltmeter to test point F007 (pin 18 of 7200). 5. Turn the set on and record the voltage reading from test point F007 (typically 4.5 to 5.0Vdc). 6. Turn the set off and remove the short circuits from test points F016, F017, and F023. 7. Connect coincidence line test point F047 (at resistor 3361, near pin 45 of 7300) to the +5Vdc line on 1900. 8. Turn the set on and tune to a local broadcast signal. 9. Select Cable Tuning from the menu system. Select channel 36 or another high band inactive cable channel. 10. While still in the cable mode, select a local VHF broadcast channel. The tuning system will attempt to tune three times, then lock on to the FCC-assigned frequency. 11. Adjust the AFT Coil (5202) to obtain a reading of 7.1Vdc (25mVdc) at test point F004. 12. Adjust the VCO Coil (5204) to obtain the same DC voltage reading at test point F007 that was noted in step 5 of this procedure. 13. Remove the jumper from the coincidence line (F047). 14. Verify this adjustment by changing between the high band inactive cable channel and a local VHF broadcast channel (ensure that the local broadcast channel locks in quickly). Tuner 2 1. Cut the shield breakpoints around 7201 and the IF circuitry (see zone K-5). Remove the top cover of the shield to gain access to the internal circuitry. 2. Short circuit test points F009 and F010 (pins 1 and 2 of 1204). 3. Short circuit test point F025 (pin 13 of 7201) to ground (the shield around 7201 is a convenient ground). 4. Connect a DC voltmeter to test point F008 (pin 18 of 7201). 5. Turn the set on and record the voltage reading from test point F008 (typically 4.5 to 5.0Vdc). 6. Turn the set off and remove the short circuits from test points F009, F010, and F025. 7. Connect coincidence line test point F047 (at resistor 3361, near pin 45 of 7300) to the +5Vdc line on 1901. 8. Turn the set on and tune to a local broadcast signal. 9. Select Cable Tuning from the menu system. Select channel 36 or another high band inactive cable channel. 10. While still in the cable mode, select a local VHF broadcast channel. The tuning system will attempt to tune three times, then lock on to the FCC-assigned frequency. 11. Adjust the AFT Coil (5219) to obtain a reading of 6.6Vdc ( 25mVdc) at test point F002. 12. Adjust the VCO Coil (5220) to obtain the same DC voltage reading at test point F008 that was noted in step 5 of this procedure. 13. Remove the jumper from the coincidence line (F047). 14. Verify this adjustment by changing between the high band inactive cable channel and a local VHF broadcast channel (ensure that the local broadcast channel locks in quickly).
Sound Alignment (Small Signal Panels ASG059, ASG060, ASG061, ASG062, ASG063)
Tuner 1 Note: This control (5201) is located on the Small Signal Panel in zone area J-2. 1. Select an active channel and loosely couple the antenna until noise/distortion is apparent in the output. 2. While keeping input signal weak enough to produce noise, adjust the Sound Discriminator (5201) for maximum output and minimum distortion. Tuner 2 Note: This control (5218) is located on the Small Signal Panel in zone area K-6.
1. Select an active channel and loosely couple the antenna until noise/distortion is apparent in the output. 2. While keeping input signal weak enough to produce noise, adjust the Sound Discriminator (5218) for maximum output and minimum distortion.
130Vdc B+ Adjustment
Note: This control (7402) is located on the Large Signal Panel. Upon replacement of the Large Signal Panel, or if a problem with the 130Vdc source is suspected, check and adjust in the following manner. 1. Connect the positive lead from a 0.1% digital voltmeter to the 130Vdc source F004 (Resistor 3453). 2. Connect the negative lead to the isolated "cold" ground. 3. Adjust 3455 (also located in the top corner of the board) to obtain a reading of 130Vdc ± 0.5Vdc.
High Voltage Adjustment
EXERCISE EXTREME CAUTION WHEN ADJUSTING HIGH VOLTAGE. Note: The following test equipment must be used. · · High voltage probe Digital multimeter with 1% (or better) dc accuracy and an input impedance of 10 Megohms ± 10%
Initial settings: · Turn the PTV on. · Confirm that the 130V source (F004) is 130V ± 1.0V. · Perform the 130Vdc B+ adjustment if the voltage is not within specified limits. · Select a non-used AUX input for a black picture. · Turn the PTV off. With the PTV off and unplugged, connect a Fluke Model 80K-40 (or equivalent) high voltage probe as follows and adjust the high voltage. 1. Connect the ground lead to the chassis ground. 2. Connect the high voltage probe to the digital multimeter. 3. Set the digital multimeter to measure dc volts.
4. Remove one of the CRT anode connections from the high voltage splitter. Note: Make sure that 3943 is turned fully clockwise. 5. Insert the probe tip into the open CRT anode connection of the high voltage splitter 6. Turn the set on. 7. Adjust 3943, High Voltage Adjust, on the Large Signal Panel (zone H-2) for a reading of 30kV ± 200V. 8. Turn the set off. 9. Remove the high voltage probe. 10. Reinstall the CRT anode connector. 11. Turn the set on and confirm proper operation.
High Voltage Frequency Adjustment
Note: 1. 2. 3. 4. 5. 6. This control (3901) is located on the Large Signal Panel in zone area H-3. Turn the set off and disconnect the ac input power. Disable the high voltage by shorting the collector of 7902 to ground. Disable the sync input to 7950 by shorting the base of 7900 to ground. Connect a frequency counter to pin 1 of 7950. Turn the set on and adjust 3901 to obtain a reading of 15.75kHz on the frequency counter. Turn the set off and remove the short circuits and the frequency counter. Some frequency counters may be too sensitive at one attenuation level and not sensitive enough at another. In this case, an oscilloscope may be used. Adjust 3901 to obtain a 63.5S delay from the leading edge of the first main pulse to the leading edge of the second main pulse.
Note:
Video Level Alignment (Small Signal Panels ASG059, ASG060, ASG061, ASG062,
ASG063) Tuner 1 Note: This control (3244) is located on the Small Signal Panel in zone area K-3.
1. Apply an NTSC color bar pattern signal to the antenna terminals. 2. Tune to the signal applied in step one. 3. Connect an oscilloscope to the emitter of 7207 (test point F001) and adjust the Video Level Control (3244) so that the video signal observed on the oscilloscope is 2Vp-p ± 50mV. Tuner 2 Note: This control (3265) is located on the Small Signal Panel in zone area K-5.
1. Apply an NTSC color bar pattern signal to the antenna terminals. 2. Tune to the signal applied in step one. 3. Connect an oscilloscope to the emitter of 7007 (test point F006) and adjust the Video Level Control (3265) so that the video signal observed on the oscilloscope is 2Vp-p ± 50mV.
PROGRAMMING FACTORY DEFAULT VALUES
The chassis is controlled by an onboard microcomputer and peripheral parts which make up the tuning system. The customer picture and sound adjustments are made using either the on-set keyboard or the remote control transmitter to enter commands. There are onscreen graphics to show the menu list of adjustments. Service mode makes it possible to change the values of special memory registers in the EEPROM (7304). These registers control the customer adjustments, PIP setups, graphics intensity, and clock calibration. These registers also make possible many other service adjustments which previously would have been controlled by conventional components mounted on the PC board.
Service Mode Entry and Exit
Using the remote control transmitter, enter the following seven-button sequence to activate the service mode: 1. 2. 3. 4. 5. 6. 7. Digit 0 Digit 6 Digit 2 Digit 5 Digit 9 Digit 6 Menu
Depressing the power button on the front of the PTV will exit the service mode, save the current modification, and turn the set off. Important There are 95 registers within this system. Some of data held in these registers should not be altered and some of the other registers are factory set and unique to the unit under test. It is highly recommended that the current values held in the registers be recorded and/or compared to Table 1-0 on the following page (with the differences noted). This procedure could save a significant amount of time should a mistake occur which causes an undesirable condition to the unit under test. Description of Service Mode The service mode is used for changing service control register values from their default values to new values; this includes all factory-preset conditions. When entering the service mode, the tuning system will attempt to retrieve the current register values stored in the EEPROM (7304). If the EEPROM has never been programmed, default data values (as shown in Register Table 1.0) will be stored. Pressing the power button on the front of the PTV while in this service mode, or setting the value of Register 00 to "00" will cause the tuning system to write all modified values to the EEPROM IC before chassis power is turned off.
Adjustment of Registers in Service Mode When the receiver is operating in the service mode, all normal onscreen displays are suppressed and replaced by the special display shown below. This display includes two lines of information at the bottom of the screen. The first line of text shows the factory part number of the microcomputer, 7300 (3135010). The next set of characters (GR9D 0.4) specifies the currently operating software version.
00B7 FG
3135010 A 3 00
GR9D 0.4 Exit No Def 1A
Information on the second line includes the currently tuned channel (channel 3 in the example above). Channel 3 is the default when entering the service mode setup because most signal test generators output on channel 3. If no signal is available on this channel, pressing the Channel Up/Down Button will allow selection of an active channel. Note: The current channel tuned, as well as the register under test, can also be directly accessed using the following method. Use the cursor control keys (surrounding the menu button on the remote control transmitter) to select the Channel Number, Register Number, or Register Value on the screen (selection is indicated by red text on a black background). The default selection when entering the service mode setup is the Register Number. Pressing the left cursor key will cause the Channel Number to be selected. Once the appropriate selection has been made, the number keys may be used to directly access the desired channel number.
The current Register Number (00) is displayed to the right of the Channel Number. Next is a short description of that register (Exit No Def). Farthest to the right is the hexadecimal value currently held in that register (1A). Selecting various registers and modifying values held in those registers may be accomplished through the use of the cursor control keys on the remote control transmitter. a) The cursor-left and cursor-right keys allow selection of the channel, the register, and the data held in that register. b) The cursor-up and cursor-down keys allow the data value to be adjusted up or down.
System Information/Diagnostics
While in the service mode, pressing the Status button (on the remote control transmitter) will cause two more lines of information to appear at the top of the screen. The first line (00B7) is the "run timer" data in hexadecimal form. This data shows the total (in hours) of on-time, and in this example relates to 183 hours. The second line displays a string of letters (FG) identifying those subsystems which could be present but did not respond to the microcontroller commands (via the I2C Bus) when the service mode command was first acted upon. The possibilities are listed below. DEVICE ERROR CODE A B C D E F G H I J K L M N I2C-BUS DEVICE M24C32W Main EEPROM Convergence Spline Processor M24C32W Convergence EEPROM TELH9-205A Tuner A TA1276 Video Processor TA8859 Deflection Processor TDA9855 Audio Processor TDA8444 DAC CXA1855 A/V Switch MC44461 SPIP TELH9-205A Tuner B GS301 Guide Plus ASIC CXA1114 A/V Switch S87652 ESI Bus Micro DEVICE LOCATION 7304, Small Signal Panel 7003, Convergence Panel 7007, Convergence Panel 1900, Small Signal Panel 7600, Small Signal Panel 7551, Large Signal Panel 7120, Small Signal Panel 7702, Small Signal Panel 7013, Rear Jack Panel 7001, Small Signal Panel 1901, Small Signal Panel 7005, Guide Plus Panel 7009, Rear Jack Panel 7002, Rear Switch Panel
Table 1.0: Factory Register Definitions
WARNING: Do not enter FF into Exit Register 00. Entering FF into this register causes all registers to be rewritten with factory default values. WARNING: Do not enter FF into Exit Register 01. Entering FF into this register causes all registers to be rewritten and Channel Guide and Smart Picture Settings to be lost as well. In addition, the auto programming of active channels (accessible under the help section of the onscreen menu) must be performed again, as this data will also be lost. This procedure should only be performed if replacement of 7304 (EEPROM IC) is required.
REG. 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 DESCRIPTION Exit No Def EXIT DEFAULTS BRIGHTNESS PICTURE COLOR TINT SHARPNESS BASS TREBLE BALANCE SFlag 00 SFlag 01 SFlag 02 SFlag 03 SFlag 04 SFlag 05 RL Address Feature ID Feature Byte Demo ID SmClkChID Clock Cal OSD Vert OSD Horz PIP COLOR PIP TINT PIP X1 Pos PIP Y1 Pos PIP X2 Pos PIP Y2 Pos PIP Read Pos PIP Write Pos Color Dly Red Horz Red Vert Blue Horz Blue Vert MP Conv Vert MP Conv Horz L Neck CRT Picture Ht Linearity VS Corr V Shift V Comp Pict Width VALUE (HEX) 1A 1A 1F 2F 1F 1F 1F 1F 1F 1F 76 0A 0B 00 00 00 05 00 00 00 00 00 22 20 1F 1F 05 03 3C 21 09 08 02 23 6F 1F 1F 26 00 00 59 0A 00 00 0E 22 NOTES 00 saves data and powers off (see warning) Exit ROM def (see warning) Midrange 3/4 of range Midrange Midrange Midrange Midrange Midrange Midrange System flag System flag System flag System flag System flag System flag Remote locator code See Table 2.0 for details See Table 2.0 for details See Table 2.0 for details Smart clock channel See Clock Calibration Adjustments OSD vertical position OSD horizontal position PIP color control, midrange PIP tint control, midrange PIP upper left, horiz. start position PIP upper left, vert. start position PIP lower right, horiz. start position PIP lower right, vert. start position
Customer center convergence Customer center convergence Customer center convergence Customer center convergence Do not modify (vertical convergence) Do not modify (horizontal convergence) See Table 2
Do not modify Do not modify (must be 00) Do not modify (must be 00)
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
E W Parab E W Cornr Trapezium H Comp VSS Corr Horz Ph RGB Brt RGB Cont Sub Color Sub Contr Red Drive Grn Drive Blu Drive Red Cut-Off Grn Cut-Off Blu Cut-Off Chroma Color Sys SVM DC Restore Stretch 1 Stretch 2 ABL 1 ABL 2 Def Cntrl Takeoff Freq Vid Cntrl 1 Video Ctl 2 G2 Setup Sub Bright Sub Tint Subwoof/Surr Aud Cntrl 2 Aud Cntrl 3A Aud Cntrl 3B Aud Align 1 Aud Align 2 Aud Align 3 GP OSD HPos GP OSD VPos GP OSD HSize GP OSD VSize GP PIP HPos GP PIP VPos GP PIP HSize GP PIP VSize Address Data Bank
00 00 39 00 00 13 14 56 09 14 00 40 40 80 80 80 F1 27 80 00 80 01 01 00 00 00 10 00 1A 8B 2F 2C 70 06 06 1B 10 0B 10 09 70 22 06 03 37 45 75 1F 00
Do not modify Do not modify Do not modify Do not modify (must be 00) Do not modify (must be 00)
Do not modify Do not modify Do not modify Do not modify Do not modify Do not modify Do not modify Do not modify Do not modify Data=00 kills video and OSD
Do not modify Do not modify see Stereo Decoder Alignments, Composite Input Level Adjustment Spectrum Adjustment (Stereo Alignment) Do not modify Do not modify
Address of EEPROM where data is stored
Clearing Customer Settings Entering 00 into Exit Default Register 01 resets all customer settings (including parental control codes) and returns the set to its original factory form. Note: Parental control can also be defeated by entering 0711 twice at the Setup Code Menu under Parental Control.
Table 2.0: Registers 17, 18, 19 & 39
Register 17 Feature ID, Register 39 L. Neck CRT, Register 19 Demo ID and Register 18 Feature Byte Feature ID Chassis PTV835 PTV840 PTV841 PTV842 PTV843 PTV844 PTV853 PTV855 Register 17 Value 02 03 04 04 03 04 05 05 Feature Byte Register 18 Value 0E 1E 03 02 0E 03 1E 3E Demo ID Register 19 Value 02 02 00 00 02 00 01 01 L. Neck CRT Register 39 Value 00 Basic (Fgtr) 00 Core (Philips / Mag) 00 Latam (Core) 00 Korea (Core) 00 Sears (Philips / Mag) 00 Taiwan (Core) A5 Marantz (Stmt) A5 Philips (Stmt)
Sub-Contrast Alignment 1. Enter the service mode (06-25-96-Menu) and inject an NTSC color bar pattern signal. 2. Tune the receiver to the signal applied in step one. 3. Connect an oscilloscope to pin 41 of 7600 (on the Small Signal Panel). Adjust the Sub-Contrast Register (55) so that the video signal observed on the oscilloscope is 1Vp-p ± 10mV. (Typical default value is 1C hex.) Sub-Brightness Adjustment Note: Refer to the Gray Scale Tracking Sub-Brightness procedure for the precise setting of all interrelated controls.
Picture Height Adjustment 1. Enter the service mode (06-25-96-Menu) and inject a crosshatch pattern. 2. Adjust the Picture Height Register (40) to obtain a slight underscan of the raster at the top and bottom of the screen. 3. Adjust the Picture Height Register (40) to obtain a slight overscan at the top and bottom of the screen (approximately 8% overscan total). (Typical default value is 59 hex.)
STEREO DECODER ALIGNMENTS
Note: The following procedure was performed with a Sencore VG91 Universal Video Generator and must be performed while the unit under test is in the service mode.
Composite Input Level Adjustment (Small Signal Panels ASG059, ASG060,
ASG061, ASG062, ASG063) Tuner 1 1. Connect an oscilloscope to test point F101 (pin 15 of 7120) and turn the set on. 2. Set the generator as follows: STD TV Channel 3, RF-IF Range set to HI, RF-IF Level set to NORM (1), Video Pattern = Raster, R-G-B raster controls OFF, Mode Switch set to L+R, Audio Frequency set to 300Hz, and 0 Pilot (max. CCW). 3. Enter the service mode (06-25-96-Menu) and connect the RF output of the VG91 generator to the television antenna input. 4. Adjust Register 79 (Aud Cntrl 3A) to obtain a reading of 1.4Vp-p on the oscilloscope. Note: The default value for the data in this register is 06.
Tuner 2 1. Connect an oscilloscope to test point F101 (pin 15 of 7120) and turn the set on. 2. Set the generator as follows: STD TV, Tuner B, Channel 3, RF-IF range set to HI, RF-Level set to NORM (1), Video Pattern = Raster, R-G-B raster controls OFF, Mode Switch set to L+R, Audio Frequency set to 300Hz, and 0 Pilot (max. CCW). 3. Enter the service mode (06-25-96-Menu) and connect the RF output of the VG91 generator to the television antenna input. 4. Adjust Register 80 (Aud Cntrl 3B) to obtain a reading of 1.4Vp-p on the oscilloscope. Note: The default value for the data in this register is 06.
Wide Band Adjustment
1. Turn the set off and connect an oscilloscope to F102 (pin 38 of 7120). 2. With the VG91 generator still connected to the tuner input, turn the set on. 3. Set the generator as follows: Mode Switch set to L Ch., Audio Frequency set to 300Hz, Stereo Pilot set for 100% NORM. 4. Enter the service mode (06-25-96-Menu) and adjust Register 81 (Aud Align 1) for a null reading on the oscilloscope. Note: The default value for the data in this register is 1B.
Spectrum Adjustment
1. With the VG91 generator still connected to the tuner input and the oscilloscope connected to F102 (pin 38 of 7120), turn the set on. 2. Set the generator as follows: Mode Switch set to L Ch., Audio Frequency set to 3kHz, Stereo Pilot set for 100% NORM. 3. Adjust Register 82 (Aud Align 2) for a null reading on the oscilloscope. 4. Repeat the Wide Band and Spectrum Adjustments several times to ensure the best possible settings. Note: The default value for the data in this register is 03.
FOCUS ADJUSTMENTS (Electrical and Optical)
Control Preset Positions 1. Picture setting at midrange. 2. Sharpness setting at midrange. 3. Brightness setting at midrange. 4. Color setting at minimum. 5. Tint setting at midrange.
Electrical Focus
1. With the set tuned to a crosshatch pattern, this adjustment can be made from the back of the set (with the light shield removed). The pattern will appear clearer if the front of the screen is covered with a dark cloth. 2. Cover two of the CRT Output Lenses with 7" x 7" pieces of cardboard (or some other opaque material). 3. Observe the magnified reflections of the individual picture tubes on the back side of the viewing screen. 4. Adjust the appropriate focus controls (on the Screen/Focus Control Block) for the sharpest raster image. 5. Confirm correct focus by viewing the screen from the front of the unit. 6. Repeat steps two through five to focus the other two CRTs.
Optical Focus
1. With the set tuned to a crosshatch pattern, this adjustment can be made from the back of the set (with the light shield removed). The pattern will appear clearer if the front of the screen is covered with a dark cloth. 2. Cover two of the CRT Output Lenses with 7" x 7" pieces of cardboard (or some other opaque material). 3. Loosen the lens retaining wing nuts on the CRT Output Lens and Housing Assembly. 4. Move the wing nut in the slot of the uncovered lens to locate the optimum optical focus (viewing the picture from the back side of the screen), then retighten the wing nut. 5. Confirm correct focus by viewing the screen from the front of the unit. 6. Repeat steps two through five to focus the other two CRTs.
Gray Scale and Black and White Tracking (G2) Adjustment
Note: Perform Electrical and Optical Focus Adjustments before attempting this adjustment. 1. Remove the Light Barrier (if present) in order to view the Main Lens Output of each picture tube. Note: Any dust should be cleaned from the output lenses, mirror, and back of the screen with a soft cloth.
2. Using an NTSC generator, inject a gray scale graduation pattern. If that pattern is not available, select a good channel containing high contrast program material. 3. Turn the set on and tune to the signal described in step two. 4. Set the customer picture control to ¾ range and set the sharpness, brightness and tint controls to midrange. Set the customer color control to minimum. 5. Enter the service mode (06-25-96-Menu). Register 00 will be displayed. Use the number keys of the remote control transmitter to select Register 74. Note: Do not use the arrow keys to scan to the desired register. Scanning through or keying into Register 04 Color Default will turn the color back on to its midrange point. This feature allows resetting the customer color default level before leaving the service mode.
6. Ensure the Cut-Off Registers (59, 60, and 61) are set to 80H default values. Refer to Table 1.0, Factory Register Definitions, and correct if necessary.
7. Ensure the Drive Registers (56, 57, and 58) are set to 40H default values. Refer to Table 1.0, Factory Register Definitions, and correct if necessary. 8. Access Register 74 (G2 Setup) and enter the value "00" in that register. The screen will go blank and all onscreen displays will disappear. Note: This step places the cathodes of all three CRTs at 185Vdc. This is the optimum condition to set CRT Cutoff.
9. Turn all G2 Controls (on the Screen/Focus Control Block) to minimum (fully CCW). 10. Looking into the Output Lens, bring up each of the G2 (Screen) Controls (bottom row of the Focus/HV Dist. Module) to barely light each tube. Set as dim as possible, but make the apparent brightness of each tube the same. 11. Press the arrow up () button on the remote control transmitter once. The picture and onscreen display will reappear. Refining Gray Scale and Black and White Tracking 1. Remove any color tint from the dark areas of the picture using the appropriate Cutoff Control Registers (59, 60, and 61). 2. Remove tint from the intermediate/bright part of the picture using the Drive Control Registers (56, 57, and 58). 3. Confirm the color tracking by observing the Gray Scale while adjusting the Picture Control from minimum to maximum range (high to minimum brightness). Adjust Cutoff and Drive control register values to obtain optimum performance.
CENTERING, GEOMETRY, AND CONVERGENCE ADJUSTMENTS
Important: The PTV 830-865 series chassis utilizes a Digital Convergence Panel. Geometry and screen convergence settings are contained within the EEPROM located on the Digital Convergence Panel. These settings may easily be modified through the following procedures. Notes on Digital Convergence 1. When aligning digital convergence, the adjustments are very interactive, in that a change in one quadrant will potentially affect other areas of the screen, thus requiring several alignment passes through the convergence sequences. 2. A convergence panel severely out of convergence will not necessarily have perfect icon shapes. It is not uncommon to see bent or twisted icons. 3. In some instances, to initiate icon movement with one of the arrow functions on the remote control transmitter, it may be necessary for the technician to hold the desired button for several moments to see movement. This is normal. If movement does not occur, continue alignment sequence in other areas of the screen (use icon positioning keys 2, 4, 6, 8) then return to the problem area of the screen. The technician may need to save present settings then exit to the convergence menu, then return to the problem area of the screen. 4. When performing convergence procedures, be sure to be at eye level with the area of the screen being adjusted.
5. When converging a PTV, it is not required to follow the predefined sequence of adjustment points. When converging or adjusting the green geometry of a set that is severely out of convergence, begin at the outer regions (edges) of the screen, working in a circular pattern toward the middle. Move each icon only a short distance toward the target point, then continue circling the outer perimeter, moving each sector partially into convergence. Digital Convergence Alignment of the chassis consists of any one or a combination of the following procedures. A. The first procedure, "Convergence Touch Up," allows for minor convergence adjustment of any color. With Convergence Touch Up it is assumed that one or two of the colors are geometrically correct and may be used as reference for the color(s) requiring alignment. This alignment is required for minor convergence adjustments, single yoke or CRT replacements, and any physical alteration of a single Lens/CRT Assembly. B. The second procedure, "Mechanical Alignment," is required with major convergence and geometry alignments, yoke replacement, convergence module replacement, the replacement of a CRT, or physical alteration of the Lens/CRT Assembly. C. The third procedure, "Major Convergence/Geometry Alignment," is required when a Convergence Module or all three CRTs are replaced. This procedure is also required if the green geometry requires adjustment. Note: If the screen geometry of the red or blue gun is correct, use the "Convergence Touch Up" procedure to converge the green using the red or blue as a reference. The set should be warmed up for at least 20 minutes prior to making any convergence or geometry adjustments.
Note:
CONVERGENCE SERVICE MODE PROCEDURES
Note: This procedure is required for all of the following geometry and convergence adjustments. In convergence mode, the channel up/down, audio up/down, and mute keys work normally. The status/exit key exits convergence mode, and the menu cursor controls move the cross symbol during convergence. All other remote control key commands are ignored by the remote control receiver.
Using the remote control transmitter, enter the following seven-button sequence to activate the convergence mode. 0-6-2-5-9-7-Menu
The opening menu will appear. Channel 3 Use Channel to Select a Channel with Video Remote control key functions: , , , : Adjust Convergence M: Advance "cross" location 2, 8, 4, 6: Move "cross" location Up, Down, Left, Right 3: Exit Convergence Status: Abort/Cancel Changes M: Begin Convergence Note: Video information must be present to correctly adjust the convergence. A signal source is required to lock the vertical and horizontal sync. After entering the convergence service mode, verify the presence of a video source by confirming the presence of active audio (use the volume up function on the remote control transmitter). Use the channel up and down function on the remote control transmitter to select the desired tuning source.
Select item "M" from the first menu, then the convergence menu will appear. Channel 3 Convergence: 1: green geometry 2: red to green 3: blue to green 4: green to red 5: green to blue Status: Abort/Cancel Changes
Convergence Touch Up Procedure
1. Enter the convergence service mode (06-25-97-Menu). 2. Select the color which requires adjustment. Note: Do not select green geometry (1). This procedure is described under the "Major Convergence/Geometry Alignment Procedure." If green geometry is altered during this procedure, it may become necessary to perform the Major Convergence/Geometry Alignment.
3. Cover the output lens of the single color presently not being adjusted (e.g., if you select green to red (4), cover the blue output lens). 4. The highlighted adjustment icon (cross) should be illuminated on the middle left side of the screen. Make the necessary convergence adjustments using the following remote control transmitter keys: Use the cursor up key () to adjust the selected color up. Use the cursor down key () to adjust the selected color down. Use the cursor right key () to adjust the selected color to the right. Use the cursor left key () to adjust the selected color to the left.
5. Move to the next location to be converged. It is not required that the full convergence sequence be followed while performing the Convergence Touch Up Alignment Procedure. The following alternate remote control transmitter keys allow for positioning of the icon to the desired adjustment location: Key 2 on the remote control transmitter moves the adjustment icon upward. Key 8 on the remote control transmitter moves the adjustment icon downward. Key 4 on the remote control transmitter moves the adjustment icon to the left. Key 6 on the remote control transmitter moves the adjustment icon to the right. 6. Return to the convergence service menu by pressing key number 3 on the remote control transmitter or by sequencing the icon to the last adjustment point at the lower right corner of the screen and pressing the Menu (M) key on the remote control transmitter. 7. Repeat steps one through six for other required convergence alignments. 8. To save the new adjustment settings, exit/save the convergence service mode by pressing key number 1 on the remote control transmitter. This writes the corrections to the EEPROM on the Convergence Module. Note: To save the convergence corrections made above, you must exit the convergence menu by selecting Exit/Save Data (1).
Convergence Center Frequency Adjustment
Note: This adjustment should not be done unless a component in the PLL circuit has been replaced. 1. Connect a voltmeter from F001 on the Convergence Board to cold ground (use top shield). 2. Adjust 1001 to obtain a reading of 1.5Vdc. 3. Attach a scope to the collector of transistor 7000 and verify the clock frequency is 13.59 MHZ.
Major Convergence/Geometry Alignment Procedure
Major Convergence/Geometry Alignment is required when replacing the Digital Convergence Module or when all three CRTs require replacement. Note: The following procedure must be performed in order to insure satisfactory results. Use the following order to converge a set requiring Major Convergence/Geometry Alignment.
1. CRT Screen Centering (Mechanical) using the centering tabs around the yoke 2. Aligning the convergence, by first setting the green geometry using the convergence template, then following up with the Red and Blue Convergence Alignment.
Screen Templates:
50" ST4161 60" ST4130-60 55" ST4162 64" ST4160
To order parts, call the TOLL FREE Philips Sales Center number: (In U.S.A.) 1-800-851-8885, (Fax) 1-800-535-3715, (In Canada) 1-800-363-PART
CRT Screen Centering (Mechanical)
1. Locate the screen center by placing strings diagonally across the viewing area of the screen from corner to corner. The screen template, if centered correctly on the screen, can also provide the center point location. 2. Enter the service setup mode (06-25-96-Menu-Menu) and confirm approximate register values of the following registers. Note: Confirming the following register values is not required if the Small Signal or Large Signal Panels have not been replaced or altered.
3. 4. 5. 6. 7. 8. 9.
Function Register Value Picture H 40 59 Linearity 41 0A V S Corr 42 00 V Shift 43 00 V Comp 44 0E Pict Width 45 22 E/W Parab 46 00 E/W Cornr 47 00 Trapezium 48 39 H Comp 49 00 VSS Corr 50 00 Horz Ph 51 13 Press the power button on the front of the PTV to save the current modification, exit the service mode, and turn the set off. Connect a signal source (pattern generator) to the antenna terminal of the set. A signal source must be present while following these procedures. Enter the convergence service mode (06-25-97-Menu). Connect a jumper wire from pins 1 to 2 of test point F1000 on the Convergence Panel. Select "1 Green Geometry" from the convergence service mode menu. Cover the red and blue output lenses using 7" x 7" pieces of cardboard (or some other opaque material). The highlighted icon (cross) may be visible on the left side of the screen about halfway up. Position the icon at the screen's approximate center by pressing the M on the remote control transmitter three times. Using the centering tabs of the yoke, position the highlighted green icon to the screen center as defined by the diagonal strings positioned across the viewing area of the screen (or by using the center point on the screen template). In some cases there may be insufficient range with the centering tabs to position the green icon at the screen's center. In this case, position the icon as close as possible to the center of the screen.
Note:
10. Confirm proper centering by viewing the screen from the front of the unit. 11. Return to the convergence service mode menu by selecting number three on the remote control transmitter. Select "2 Red to Green" and cover the green and blue output lenses. Repeat steps 8 through 10, using the red yoke centering tabs. 12. Return to the convergence service mode menu by selecting number three on the remote control transmitter. Select number 2 to repeat convergence. Select "3 Blue to Green" and cover the red and green output lenses. Repeat steps 8 through 10 using the blue yoke centering tabs. 13. Exit the convergence mode by selecting Status Exit on the remote control transmitter. Remove the coverings from the output lenses. CRT centering is complete. 14. Remove the jumper from F100042 on the Digital Convergence Module.
GREEN GEOMETRY
The green geometry must be accurately adjusted to achieve proper convergence and screen geometry. The red and blue displays will individually be made to conform to the green. 1. Confirm proper CRT centering as described in the previous procedure. 2. Remove the protective screen enhancement filter (if present) to make the following adjustments. 3. Attach the screen template to the screen using a low-adhesive tape and enter the convergence service mode (06-25-97-Menu). Note: Video information must be present to correctly adjust the convergence. The presence of a suitable video signal can be confirmed by the presence of audio on the channel selected.
4. Select M to begin the convergence adjustments. 5. Select "1 Green Geometry." The green icon should be positioned near the left edge of the screen on the middle row of the template. If it is not visible, hold the right arrow key of the remote control transmitter until the icon is visible on the screen. Use the M key to position the icon on the next horizontal point in the convergence sequence. Using the remote control transmitter arrow buttons, move the green icon only halfway to the next template point. Continue through the entire green geometry sequence, moving the green icons only halfway to the target points on the template. Upon reaching the "End Here" point on the template, press M to recalculate. 6. Select "2 Repeat Convergence" by pressing the number "2" on the remote control transmitter. Select "1 Green Geometry." Follow the green geometry sequence through a second pass, this time accurately aligning the green icon to the alignment points on the template. Repeat the green geometry sequence as required. When the procedure is complete, save the changes and exit by entering the converge page and selecting 1. 7. Confirm the accuracy of the green geometry.
Red and Blue Convergence
1. Remove the screen template. 2. Enter the convergence service mode (06-25-97-Menu) and select M to begin the convergence adjustments. Note: 3. Video information must be present to correctly adjust the convergence. The presence of a suitable video signal can be confirmed by the presence of audio on the channel selected.
Select "2 Red to Green" and cover the blue output lens with a 7" x 7" piece of cardboard (or some other opaque material). 4. The red icon should be positioned near the left side of the screen on the middle row of convergence points. If the red icon is not visible, hold the right arrow key of the remote control transmitter until the icon is visible on the screen. Use the M key to position the icon on the screen at the next point in the convergence sequence. Use the arrow keys to move the red icon approximately halfway to the green icon. 5. Continue through the entire red to green convergence sequence by moving the red icons only halfway to the green icons. Upon reaching the last position at the lower right of the screen, select M to recalculate. 6. Select Repeat Convergence by pressing the number "2" on the remote control transmitter. Select "2 Red to Green" and follow the red to green convergence sequence through a second pass, this time accurately aligning the red icon to the green. Repeat the red to green convergence sequence as required to accurately align the red to green convergence. When the procedure is complete, save the changes and exit by selecting 1 from the convergence menu.
7.
Enter the convergence service mode (06-25-97-Menu) and select M to begin the convergence adjustments. Video information must be present to correctly adjust the convergence. The presence of a suitable video signal can be confirmed by the presence of audio on the channel selected.
Note:
8. Select "3 Blue to Green," remove the cover from the blue output lens, and cover the red output lens with a 7" x 7" piece of cardboard (or some other opaque material). 9. Repeat the procedure in steps four through six by adjusting the blue icons to the green. 10. When the convergence alignment is complete, save the data by selecting "1" from the convergence service menu. 11. Remove the cover from the red output lens. 12. Refine the complete convergence performance as necessary.
Horizontal Phase
1. Enter the service setup mode (06-25-96-Menu). 2. Select Register 02 (Brightness), note the current hex value, then increase the value to 7C. 3. Select Register 45 (Pict Width), note the current hex value, then reduce the picture width by approximately 11/2 to 2 inches. 4. Tune the set to an active broadcast or cable channel. Note: It is recommended that a signal source other than a signal generator be used to do this alignment. Use an RF signal source such as a broadcast channel.
5. Select register 51 (Horz Ph). 6. Using 7" x 7" pieces of cardboard (or some other opaque material), cover the red and blue CRT output lenses. 7. Adjust the horizontal phase to center the picture information onto the reduced raster. This centering can easily be accomplished by observing the left and right edges of the reduced raster. Remove the covering from the CRT output lenses. 8. Select Register 45 and reset it to the value previously noted in step three of this procedure. 9. Select Register 02 and reset it to the value previously noted in step two of this procedure (typical default value is 1F).
Picture Tube Replacement
Replacement of the cathode ray tube (CRT) and/or optical system components of a Projection TV (PTV) can be easily accomplished by following general guidelines. Use care when working around the CRT and optical systems of the PTV. The PTV light path encompasses a number of precision optical components. These include lenses, mirrors, and lenticular and Fresnel screens. The PTV incorporates three separate CRTs, representing green, red, and blue outputs. Each CRT uses an independent deflection/convergence yoke, magnetic centering ring, coupler, C-element lens, and output lens (A/B lens). Each tube is mechanically fastened to a coupler which houses