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FILE NO. SM-CTV-O-046
SERVICE MANUAL
MODEL NO.: AT3208S CHASSIS NO.: CH-10C3
COLOR TELEVISION
Please read this manual carefully before service
PRINTED IN CHINA.MAY.2003 ©
CONTENTS
SAFETY INSTRUCTIONS ....................................................................... 1 SPECIFICATIONS.................................................................................... 3 KEY ICS AND ASSEMBLIES................................................................... 4 SYSTEM BLOCK DIAGRAMS ................................................................. 5 IC DATA AND WAVEFORMS OF KEY POINTS ...................................... 8 CIRCUIT ADJUSTMENTS ..................................................................... 38 SET-UP ADJUSTMENTS....................................................................... 40 SERVICE MODE AND BUS DATA ......................................................... 42 TROUBLESHOOTING FLOW CHARTS ................................................ 44 SERVICE SPARE PARTS LIST.................................................................. APPENDIX: 1. CIRCUIT DIAGRAM 2. FINAL WIRING DIAGRAM 3. FINAL ASSEMBLY DIAGRAM 4.PRINTED CIRCUIT BOARD DIAGRAMS
SAFETY INSTRUCTIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE PRECAUTION , SAFETY PRECAUTION AND INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. The nominal EHT for this TV is 28.8 0.8KV at zero beam current (minimum brightness) operating at AC 120V. The maximum EHT voltage permissible in any operating circumstances must not exceed 31KV. When checking the EHT, use the High Voltage Check procedure in this manual using an accurate EHT voltmeter. 2. The only source of X-RAY in this TV is the CRT. To prevent X-ray radiation, the replacement CRT must be identical to the original fitted as specified in the parts list. 3. Some components used in this TV have safety related characteristics preventing the CRT from emitting X-ray radiation. For continued safety, replacement component should be made after referring the PRODUCT SAFETY NOTICE below. SAFETY PRECAUTION 1. The TV has a nominal working EHT voltage of 28.8KV. Extreme caution should be exercised when working on the TV with the back removed. 1) Do not attempt to service this TV if you are not conversant with the precautions and procedures for working on high voltage equipment. 2) When handling or working on the CRT, always discharge the anode to the TV chassis before removing the anode cap in case of electric shock. 3) The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme care while handling. 4) Do not hold the CRT by the neck as this is a very dangerous practice. 2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly as supplied from factory. 3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable isolating transformer of beyond rated overall power when servicing or connecting any test equipment for the sake of safety. 4. Replace blown fuses within the TV with the fuse specified in the parts list. 5. When replacing wires or components to terminals or tags, wind the leads around the terminal before soldering. When replacing safety components identified by the international hazard symbols in the circuit diagram and parts list, it must be the company-approved type and must be mounted as the original. 6. Keep wires away from high temperature components. X-RAY RADIATION
PRODUCT SAFETY NOTICE
1
SERVICE MANUAL
SAFETY INSTRUCTIONS(continued)
PRODUCT SAFETY NOTICE Many electrical and mechanical components in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-ray radiation protection afforded by them can not necessarily be obtained by using replacements rated at higher voltages or wattage, etc. Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols in the circuit diagram and parts list. Before replacing any of these components read the parts list in this manual carefully. Substitute replacement components which do not have the same safety characteristics as specified in the parts list may create X-ray radiation. PRECAUTIONS Power Sources-The TV set should be operated only from the type of power source indicated on the TV set or as indicated in the Service Manual. If you are not sure of the type of power supply in your home, consult your sales person or your local power company. For TV sets designed to operate from battery power,or other Sources, refer to the operating instructions.
120Vac
Water and Moisture Warnings-Do not use the TV set near water-for example,near a bath tub,wash bowl,kitchen sink, or laundry tub;in a wet basement;or near a swimming pool; and the like.The TV set shall not be exposed to dripping or splashing and no objects filled with liquids,such as vases,shall be placed on the TV set.
Grounding or Polarization-Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet,consult an electrician for replacement of the obsolete outlet. Wide blade Lame large Cuchilla ancha Alternate Warnings-A three wire grounding type plug-a plug having a third (grounding) pin. This plug will only fit into grounding type power outlet. Ventilation-Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the TV set and to protect it from overheating, and these openings must not be blocked or covered. The openings should never be blocked by placing the TV set on a bed, sofa, rug,or other similar surface. This TV set should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturer s instructions have been adhered to.
2
SERVICE MANUAL
SPECIFICATIONS
Model Number Television system VHF 2 Channel coverage AT3208S NTSC-M 13/UHF 14 W) 94, 100 181 75 (unbalanced) 480mm 18.9in 125) 69/CABLE TV:
MID BAND (A-8 A-1,A I) SUPER BAND (J ULTRA BAND (65 Channels preset Antenna input Picture tube Effective screen dimensions(Approx.) Max. audio output Power source Weight (Approx.) Dimensions (W/H/D) (Approx.) HYPER BAND (AA ZZ, AAA, BBB)
640 25.2
5W+5W 120Vac 60Hz 57kg(126 lbs.) 854 33.6 980 38.6 684 26.9 777 30.6 150W 560mm 22.1in 655mm 25.8in
Packing Dimensions (W/H/D) (Approx.) Rated power consumption Designs and specifications are subject to change without notice.
3
SERVICE MANUAL
KEY ICS AND ASSEMBLIES
Table 1 Key ICs and Assemblies
Serial No. Position No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 N301 N401 N601 ND01 N001 N002 NQ821 NY01 NK02 NK03 N606M NQ102 DS01 DS02 N103 N402 A101
Type OM8839PS TDA8350-N6 TDA7057AQ HEF4053BP LC86F3248AU-DIP AT24C08-10P STR-6626 TDA6108JF TC90A13N MM1031X5 MSP3440 TDA9808T TA1219N TA78L009AP TA78L009AP LM317T TDQ-6F2-M
Function Description Small signal processor Vertical output circuit Sound power amplifier Analog switch circuit Microcontroller EEPROM Power thick-film circuit Video amplifier Digital comb filter Luminance signal amplifier Audio demodulating and NICAM decoding circuit IF signal processor TV/Video switch circuit Tri-terminal regulator Tri-terminal regulator Tri-terminal regulator Tuner
4
SYSTEM BLOCK DIAGRAMS (continued)
SERVICE MANUAL
5
Fig.1 Structure Block Diagram for CH-10C3 Chassis
SERVICE MANUAL
SYSTEM BLOCK DIAGRAMS (continued)
Fig.2 Block Diagram for CH-10C3 Supply Voltage System
6
SERVICE MANUAL
SYSTEM BLOCK DIAGRAMS (continued)
Fig.3 Block Diagram for CH-10C3's Remote Control Structure
7
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS
STR-F6626 Power Thick-film Circuit
1. Features STR-F6626 is one of Sanken STR-F66XX switch power thick-film hybrid Ics, which comprises a start circuit, oscillator, latch, driver, overcurrent protector, overvoltage protector and overheat protector. 2. System Block Diagram
3.Refer to Table 2 about Functions and Service Data of STR-F6626's Each Pin.
8
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
LC86F3248A (D701) 8-Bit Single Chip Microcontroller
1. Overview The LC863264/56/48/40A are 8-bit single chip microcontrollers with the following on-chip functional blocks: -CPU:Operable at a minimum bus cycle time of 0.424µs -On-chip ROM capacity Program ROM:64K/56K/48K/40K bytes CGROM:16K bytes -On-chip ROM capacity: 640 bytes -OSD RAM: 352×9 bits -Closed-Caption TV controller and the on-screen display controller -Closed-Caption data slicer -Four channels×8-bit AD Converter -Three channels×7-bit PWM -Two16-bit timer/counters, 14-bit base timer -8-bit synchronous serial interface circuit -IIC-bus compliant serial interface circuit (Multi-master type) -ROM correction function -16-source 10-vectored interrupt system -Integrated system clock generator and display clock generator Only one X tal oscillator (32.768kHz) for PLL reference is used for both generators TV control and the Closed Caption function All of the above functions are fabricated on a single chip
9
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
LC86F3248A (continued)
2. System Block Diagram
Fig.5
3.Refer to Table 3 about Functions and Service Data of LC86F3248'S Each Pin.
10
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
AT24C08 EEPROM
1. Features Data EEPROM internally organized as 1024/2048 bytes and 64/128 pages×16 bytes Page protection mode, flexible page-by-page hardware write protection -Additional protection EEPROM of 64/128 bits, 1 bit per data page -Protection setting for each data page by writing its protection bit -Protection management without switching WP pin Low power CMOS Vcc=2.7 to 5.5V operation Two wire serial interface bus, I2C-Bus compatible Filtered inputs for noise suppression with Schmitt trigger Clock frequency up to 400 kHz High programming flexibility -Internal programming voltage -Self timed programming cycle including erase -Byte-write and page-write programming, between 1 and 16 bytes -Typical programming time 6 ms(<10ms) for up to 16 bytes High reliability -Endurance 106 cycles1) -Data retention 40 years1) -ESD protection 4000 V on all pins 8 pin DIP/DSO packages Available for extended temperature ranges -Industrial: -40 to +85 -Automotive: -40 to +125 3. Block Diagram
2. Pin Configuration
4. Refer to Table 4 about Functions and Service Data of AT24C08's Pins.
Fig. 6
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
OM8839PS/TDA884X I2C-bus Controlled PAL/NTSC/SECAM TV Processors
1. Features The following features are available in all IC's: Multi-standard vision IF circuit with PLL demodulator Alignment-free multi-standard FM sound demodu-lator (4.5 MHz to 6.5 MHz) Audio switch Flexible source selection with CVBS switch and Y(CVBS)/C input so that a comb filter can be applied Integrated chrominance trap circuit Integrated luminance delay line Asymmetrical peaking in the luminance channel with a (defeatable) noise coring function Black stretching of non-standard CVBS or luminance signals Integrated chroma band-pass filter with switchable centre frequency Dynamic skin tone control circuit Blue stretch circuit which offsets colours near white towards blue RGB control circuit with "Continuous Cathode Calibration" and white point adjustment Linear RGB inputs and fast blanking Possibility to insert a"blue back" option when no video signal is available Horizontal synchronization with two control loops and alignment-free horizontal oscillator Vertical count-down circuit Vertical driver optimised for DC-coupled vertical output stages I2C-bus control of various functions Low dissipation (850 mW) 2. General Description The various versions of the TDA 884X/5X series are I2C-bus controlled single chip TV processors which are intended to be applied in PAL, NTSC, PAL/NTSC and multi-standard television receivers. These IC's are nearly pin compatible with the TDA 837× TV processors but have a higher degree of integration because the delay line (TDA4665 function) and the SECAM decoder have been intagrated.In addition to these functions some additional features have been added like "Continuous Cathode Calibration" (2-point black current loop which results in an accurate biasing of the 3 guns), adjustable luminance delay time, blue stretching and dynamic skin tone ("flesh") control. Functionally the IC series is split up in 3 categories, viz Versions intended to be used in economy TV receivers with all basic functions (envelope: S-DIP 56 and QFP64) Versions with additional features like E-W geometry control, H-V zoom function and YUV interface which are intended for TV receivers with 110° picture tubes (envelope: S-DIP 56) Versions which have in addition a second RGB input with saturation control and a second CVBS output (envelope:QFP 64)
12
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
OM8839PS/TDA884X (continued)
3. Block Diagram
4. Refer to Table 5 about Functions and Service Data of OM8839PS
s Each Pin.
13
Fig.7 Block Diagram OM8839PS (S-DIP 56 Envelope)
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TDA8350Q
DC-coupled Vertical Deflection and East-West Output Circuit 1. Features Few extemal components Highly efficient fully DC-coupled vertical output bridge circuit Vertical flyback switch Guard circuit Protection against: -short-circuit of the output pins -short-circuit of the output pins to Vp 3. Block Diagram High EMC immunity due to common mode inputs Temperature (thermal) protection East-West output stage with one single conversion resistor. 2. General Description
The TDA8350Q is a power circuit for use in 90° and 110° colour deflection systems for field frequencies of 50 to 120 Hz. The circuit provides a DC driven vertical deflection output circuit, operating as a highly efficient class G system and an East-West driver for sinking the diode modulator current.
Fig.8
4. Refer to Table 6 about Functions and Service Data of TDA8350Q s Each Pin.
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TDA7057AQ
2 8W Stereo BTL Audio Output Amplifier with DC Volume Control
2. General Description The TDA7057AQ is a stereo BTL output amplifier with DC volume control. The device is designed for use in TVs and monitiors, but is also suitable for battery-fed portable recorders and radios. Missing Current Limiter (MCL) A MCL protection circuit is built-in. The MCL circuit is activated when the difference in current between the output terminal of each amplifier exceeds 100 mA (typical 300 mA). This level of 100 mA allows for single-ended headphone applications. 1. Features DC volume control Few external components Mute mode Thermal protection Short-circuit proof No switch-on and switch-off clicks Good overall stability Low power consumption Low HF radiation ESD protected on all pins. 3. Block Diagram
Fig.9
4.Refer to Table 7 about Functions and Service Data of TDA7057AQ s Each Pin.
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TDA6108JF
Triple Video Output Amplifier
1. Features Typical bandwidth of 9.0 MHz for an output signal of 60 V (peak-to-peak value) High slew rate of 1850 V/ S No external components required Very simple application Single supply voltage of 200 V Internal reference voltage of 2.5 V Fixed gain of 51 Black-Current Stabilization (BCS) circuit Thermal protection. 3. Ordering Information Type Number TDA6108JF Name DBS9MPE Package Description Plastic DIL-bent-SIL medium power package with fin;9 leads Version SOT111-1 2. General Description The TDA6108JF includes three video output amplifiers in one plastic DIL-bent-SIL 9-pin medium power (DBS9MPF) package (SOT 111-1), using high-voltage DMOS technolog y, and is intended to drive the three cathodes of a colour CRT directly. To obtain maximum performance, the amplifier should be used with black-current control.
4. Block Diagram
TDA6108JF
Fig. 10
4. Refer to Table 8 about Functions and Service Data of TDA6108JF s Each Pin.
16
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
HEF4053 Triple 2-channel Analog Multiplexer/Demultiplexer
1. Description The HEF4053 is a triple 2-channel analog multiplexer/demultiplexer with a common enable input (E). Each multiplexer/demultiplexer has two independent inputs/outputs (Y0 and Y1), a common input/output (Z), and select inputs (Sn). Each also contains two-bidirectional analog switches, each with one side connected to an independent input/output (Y0 and Y1) and the other side connected to a common input/output (Z). With (E) LOW, one of the two switches is 2. Block Diagrams selected (low impedance ON-state) by Sn. With E HIGH, all switches are in the high impedance OFF-state, independent of SA to SC. VDD and VSS are the supply voltage connections for the digital control inputs (SA to SC and E). The VDD to VSS range is 3 to 15V.The analog inputs/outputs (Y0,Y1 and Z) can swing between VDD as a positive limit and VEE as a negative limit. VDD-VEE may not exceed 15 V. For operation as a digital multiplexer/demultiplexe r, VEE is connected to VSS (typically ground).
Fig. 11
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
HEF4053 (continued)
Pinning Y0A to Y0C Y1A to Y1C SA to Sc E Pinning Diagram ZA to ZC 3. Function Table Inputs E L L H Notes H=HIGH state (the more positive voltage) L=LOW state (the less positive voltage) X=STATE is immaterial Sn L H X Channel On Y0n-Zn Y1n-Zn none Independent inputs/outputs Independent inputs/outputs Select inputs Enable input (active LOW) Common inputs/outputs
Fig. 12 Schematic Diagram (One Switch)
Ratings Limiting values in accordance with the Absolute Maximum System(IEC 134) Supply voltage (with reference to VDD) Note To avoid drawing VDD current out of terminal Z, when switch current flows into terminals Y, the voltage drop across the bidirecctional switch must not exceed 0,4 V. If the switch current flows into terminal Z, no VDD current will flow out of terminals Y, in this case there is no limit for the voltage drop across the switch, but the voltages at Y and Z may not exceed VDD or VEE 4. Refer to Table 9 about Functions and Data of IC s Each Pin. VEE -18 to + 0,5 V
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
MSP34×0G Multistandard Sound Processor Family
Release Note: Revision bars indicate significant changes to the previous edition. The hardware and software description in this document is valid for the MSP 34×0G version B5 and following versions. 1. Introduction The MSP34×0G family of single-chip Multistandard Sound Processors covers the sound processing of all analog TV-Standards worldwide, as well as the NICAM digital sound standards. The full TV sound processing, starting with analog sound IF signal-in, down to processed analog AF-out, is performed on a single chip. Figure 13 shows a simplified functional block diagram of the MSP 34×0G. This new generation of TV sound processing ICs now includes versions for processing the multichannel television sound (MTS) signal conforming to the standard recommended by the Broadcast Television Systems Committee (BTSC). The DBX noise reduction, or alternatively MICRONAS Noise Reduction (MNR) is performed alignment free Other processed standards are the Japanese FM-FM multiplex standard (EIA-J) and the FM Stereo Radio standard. Current ICs have to perform adjustment procedures in order to achieve good stereo separation for BTSC and EIA-J. The MSP 34×0G has optimum stereo performance without any adjustments. All MSP 34×0G versions are pin and software downward-compatible to the MSP 34×0D. The MSP34×0G further simplifies controlling software. Standard selection requires a single I2C transmission only. The MSP 34×0G has built-in automatic Functions: The IC is able to detect the actual sound standard automatically (Automatic Standard Detection). Furthermore, pilot levels and identification signals can be evaluated internally with subsequent switching between mono/stereo/bilingual; no I2C interaction is necessary (Automatic Sound Selection). The ICs are produced in submicron CMOS technology. The MSP34×0G is available in the following packages: PLCC68, PSDIP64, PSDIP52 PQFP80 and PLQFP64.
2. Block Diagram
Fig. 13 Simplified Functional Block Diagram of the MSP 34×0G 3. Refer to Table 10 about Functions and Service Data of MSP 34X0G s Each Pin.
19
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TDA9808T Single Standard VIF-PLL with QSS-IF and FM-PLL Demodulator
1.Features 5V supply voltage (9V supply voltage for TDA9808(DIP20) only) Applicable for IFs (lntermediate Frequencies) of 38.9MHz, 45.75MHz and 58.75 MHz Gain controlled wide band Video IF (VIF)amplifier (AC-coupled) True synchronous demodulation with active carrier regeneration (very linear demodulation, good intermodulation figures, reduced harmonics, excellent pulse response) Robustness for over-modulation better than 105% due to Phase Locked Loop (PLL)bandwidth standards VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector Tuner AGC with adjustable TakeOver Point (TOP) Automatic Frequency Control (AFC) detector without extra reference circuit AC-coupled limiter amplifier for sound intercarrier signal Alignment-free FM-PLL demodulator with high linearity Sound IF (SIF) input for single reference Quasi Split Sound (QSS) mode (PLL controlled); SIF AGC detector for gain controlled SIF amplifier; single reference QSS mixer for high performance Electrostatic Discharge (ESD) protection for all pins. control at negative modulated 2.General Description The TDA9808 is an integrated circuit for single standard (negative modulated) vision IF signal processing and FM demodulation, with single reference QSS-IF in TV and VTR sets.
20
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TDA9808T (continued)
2. Block Diagram
3. Refer to Table 11 about Functions and Service Data of TDA9808T
s Each Pin.
21
Fig. 14 Block Diagram
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TA1219AN Audio/Video Switching IC for TVs
The TA1219AN is an audio/video switching IC for TV Sets. Conforming to I2C bus standards, it allows you to perform various switching operations through the bus lines by using a microcomputer. Furthermore, since the presence of a signal on its sync signal output pin can be determined by a microcomputer. it is possible to check each input/output channel (self-diagnosis). This IC has the same pin assignments as the TA1218AN (SDIP42), a 2-channel output version of the TA1219AN, so these chips are pin compatible on pins 3 to 20 and 23 to 40 in TA1218AN.
1. Features I2C bus control Video: 5-channel inputs and 1-channel outputs (2 channels conforming to S system) Audio: 5-channel inputs and 2-channel outputs Self-diagnostic function ADC inputs based on European 21-pin standards ADC inputs based on S1/S2 terminal standards Switchable subaddressa
22
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TA1219AN (continued)
2. Block Diagram
Fig. 15
3.Refer to Table 12 about Functions and Service Data of TA1219AN s Each Pin.
23
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
TC90A13N
3 Line Digital Y/C Separation IC
The TC90A13N and TC90A13F separate luminance (Y) and Chrominance(c(signals from an NTSC composite video Signal. Lt employs the Toshiba original logical comb filter To Realize high performance Y/C separation at low cost 1. Features NTSC system PLL 4X multiplication circuit Sync. tip clamping circuit 8bit A/D converter 8bit D/A converters (2ch) 2H line memory Dynamic comb filter 1 line dot correction circuit Vertical enhancer Color killer mode (Y/C separation OFF) Chrominance wide band output mode SDIP28/SOP28 package 5V single power supply 2. Block Diagram
Fig. 16
3.Refer to Table 13 about Functions and Service Data of TC90A13N s Each Pin.
24
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
MM1031 Video Amplifier
1. Outline This IC is a 6dB amp for video signals (Y or composite signals). Gain is fixed at 6dB and it is used in 75e Signals). Gain is fixed at 6dB and it is used in 75 output circuits. 2. Features 1) For video signal (Y or composite) amplification 2) Built-in clamp circuit 3) 75 driver built in
4) Frequency response 7MHz 5) Current consumption 4mA typ. 6) Power supply voltage 5V
3. Block Diagram
Fig. 17
4. Refer to Table 14 about Functions and Service Data of MM1031 s Each Pin.
25
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
Table 2 Functions and Service Data of STR-F6626 (NQ821)'s Pins
Pin No. Function Description Overcurrent detection & voltage stabilization control input Switch transistor's source Switch transistor's drain Control circuit power Control circuit ground Digital Multimeter Positive Resistance Reference Voltage(V) (20K ) 1.87 0.09 144 17.85 0 0.687 0.0001 Negative Resistance (20K ) 0.6 0.
1 2 3 4 5
0.001
0
Table 3 Functions and Service Data of LC86F3248AV-DIP (N001)
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Function Description Not connected Clock line Data line Not connected Not connected Not connected VM circuit control Not connected Ground Input terminal for clock oscillating signal Output terminal for clock oscillating signal Supply voltage Button-control voltage input terminal Button-control voltage input terminal Standby indicator control Not connected Reset Filter Video signal input terminal Input terminal for vertical flyback pulse Input terminal for horizontal flyback pulse R character output terminal G character output terminal B character output terminal Output terminal for fast blanking signal Character level clamping Clock line 0 Data line 0 Reference Voltage(V) 4.8 4.86 0 0 0 5 0.2 1.91 2.62 5 5 5 5 5 5 5 2.83 2.75 4.7 4.08 0.01 0.01 0.01 0.01 0.01 5 5 Digital Multimeter Positive Resistance (20K ) 9.45 9.43 9.4 0 0 0 9.3 9.4 0.001 9.4 8.9 3.5 9.4 9.4 9.4 9.2 4.6 9.1 9.1 8.5 8.6 2.16 2.1 0.1 2 9.2 6.7 6.8
s Pins
Negative Resistance (20K ) 5.33 5.07 5.05 4.75 5.3 5.38 5.19 5.38 0.00 6.03 6 3.25 5.28 5.27 5.45 5.5 4.47 5.44 5.99 5.08 5.08 2.11 2.11 2.11 1.99 5.81 4.89 5.1
(Continued)
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SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
29 30 31 32 33 34 35 36 37 38 39 40 41 42 Clock line 1 Data line 1 Overload detecting input terminal Input terminal for selectable production modes Not connected Remote control input Not connected Comb filter direct-pass control Mute Not connected Not connected Not connected Standby control YUV switch control 4 3.5-3.7 5 5 0.01 5 0.01 0.01 0 0 0 0 0 0 7 7 3.6 9.4 9.2 9.3 9.4 7 9.3 9.4 9.4 9.3 7 5.9 4.54 4.54 3.34 5.18 5.46 5.43 5.4 5.1 5.15 5.34 5.3 5.38 4.9 4.93
Table 4 Functions and Service Data of AT24C08-10P (N002)'s Pins
Pin No. 1 2 3 4 5 6 7 8 Function Description Address input Address input Address input Common ground Clock line Data line PW write protect Supply voltage Digital Multimeter Positive Resistance (20K ) 0.001 0.001 0.001 0.001 7 6.9 9.5 3.5 Negative Resistance (20K ) 0.00 0.00 0.00 0.00 4.83 5.15 5.31 3.25
Reference Voltage(V) 0 0 0 0 5 4.99 4.99 5
Table 5 Functions and Service Data of OM8839PS (N301)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 Function Description SIF signal input External audio signal input Reference frequency resonant coil terminal Reference frequency resonant coil terminal PLL filter Video detection output Clock line Two-way transmission data line Gap decoupling SVHS chroma signal input SVHS luminance signal input Supply voltage Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 0.28 7.9 6.03 3.7 8.3 6.03 0 0 2.5 2.9 3.5-3.6 4.02 6.73 1.35 4 8 7.5 2.1 6.6 6.6 7.3 8 8.3 2.1 5.79 2.19 4.56 4.56 5.66 5.99 5.88 2.09
(Continued)
27
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
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 46 47 48 49 50 51 52 53 54 55 56 Composite video signal input terminal Ground Audio signal output Decoupling capacitor connection Video input Black current control input Blue (B) signal output Green (G) signal output Red I signal output Beam current control Red I signal input Green (G) signal input Blue (B) signal input Selectable primary color signal input control Luminance signal input Luminance signal output B-Y color difference signal output R-Y color difference signal output B-Y color difference signal input R-Y color difference signal input Sub-carrier output for SECAM demodulation 3.58MHz crystal oscillator 4.43MHz crystal oscillator APC low pass filter Horizontal starting supply voltage Composite video output Black level stretch Line drive pulse output Horizontal flyback pulse input/ sandcastle pulse output Line discriminator Line discriminator Ground Vertical frequency parabola output Field drive signal output Field drive signal output IF signal input IF signal input High voltage detection input Vertical sawtooth generation Vertical reference bias setting AGC filter for IF amplifier AGC output for IF amplifier Audio deemphasis Audio decoupling 3.76 0 4.39 0.01 0.41 5.62 2.58 2.67 2.56 1.9 3.7 3.7 3.7 0.06 2.58 2.58 2.46 2.42 2.46 2.42 4.32 2.52 2.52 5 8 2.54 5 3.36 0.86 3.95 3.95 0 0.76 2.18 2.18 4.65 4.65 2.02 3.85 3.89 4.47 1.41 2.91 0.5 8.8 0.01 8.3 8.13 8.5 0.17 5.9 5.9 7.6 8 8.2 8.2 1 6.6 6.7 6.7 6.7 6.7 6.7 7.1 7.5 7.7 2.3 2.4 7.8 8.5 3 8.6 8.7 8.8 0.001 8.5 8.8 8.99 8.7 8.6 8.2 8.3 8.4 8.6 9.9 8.1 8.4 5.88 0.01 5.96 5.88 5.81 5.08 5.08 5.08 5.84 5.95 5.95 5.95 0.99 5.83 5.92 5.9 5.9 5.93 5.93 5.82 5.91 5.91 5.9 2.09 5.96 4.69 2.81 5.75 5.87 5.87 0.00 5.89 5.82 5.8 6.05 6.05 5.95 5.91 5.96 5.89 5.69 5.87 5.89
28
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
Table 6 Functions and Service Data of TDA8350Q-N6 (N401)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Function Description Vertical drive input (positive) Vertical drive input (negative) Feedback input Supply voltage Output 1 Not connected Ground Pump supply voltage input Output 2 Guard output Pincushion output Pincushion input (negative) Pincushion input (positive) Digital Multimeter Positive Resistance Reference Voltage(V) (20K ) 2.16 9 2.16 9 10.09 5.8 19.49 6.4 10.09 5.8 0 0 0.001 51.3 9.85 9.8 0.28 9.1 20 9 0.71 0 8.5 0.01 Negative Resistance (20K ) 5.8 5.83 4.71 4.2 4.71 0.00 4.7 5.88 5.24 6.97 6.88
Table 7 Functions and Service Data of TDA7057AQ (N601)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Function Description Volume control input Not connected Audio R signal input Supply voltage Audio L signal input Ground Volume control input Left channel in-phase signal output Ground Left channel inverting signal output Right channel inverting signal output Ground Right channel in-phase signal output Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 0.99 15.3 6.15 0 2.4 6.51 16 9 0.47 2.4 6.51 0 0.001 0.00 1 15.6 0.15 8 12.3 5.59 0 0.001 0.00 8 12.6 5.59 8 0 8 12.6 0.001 12.6 5.59 0.00 5.59
Table 8 Functions and Service Data of TDA6108JF's Pins
Pin No. 1 2 3 4 5 Function Description G inverting input R inverting input B inverting input Ground Black level current input Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 2.7 2.6 2.7 0 6.25 5.4 5.4 5.4 0.001 17.3 4.72 4.72 4.72 0.00 5.65
(Continued)
29
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
6 7 8 9 Supply voltage B output R output G output 199.66 127.69 122.7 109 4.48 5.45 5.45 5.45
Table 9 Functions and Service Data of HEF4053 (ND01)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Function Description Signal input terminal Signal input terminal Signal input terminal Signal output terminal Signal input terminal Ground Ground Ground Control signal input terminal Control signal input terminal Control signal input terminal Signal input terminal Signal output terminal Signal input terminal Audio output Supply voltage Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 0.01 6.9 6.32 2.47 6.7 5.89 0.21 6.9 6.4 2.59 6.7 5.83 2.58 6.7 5.91 0 0.001 0.00 0 0.001 0.00 0 0.001 0.00 0.15 5.7 4.93 0.15 5.7 4.93 0.15 5.7 4.93 2.5 6.5 5.9 0 6.7 6.38 2.49 6.5 5.9 2.45 6.5 5.94 8.2 1.2 1.57
Table 10 Functions and Service Data of MSP3440 (N606M)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Function Description TP AVD-GL-OUT D-CTR-I/O-1 D-CTR-I/O-0 ADR-SEL STANDBYQ I2C-CL I2C-DA I2S-CL I2S-WS I2C-DA-WT I2S-DA-IN1 ADR-DA ADR-WS ADR-CL DVSVP DVSS NC NC NC NC Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 0.16 7.3 5.3 2.52 6.8 5.51 0.01 7.3 5.57 0.01 7.2 5.58 4.79 0.7 4.54 4.79 0.7 4.54 3.56 7 4.44 3.9 7 4.44 2.36 7.2 6.24 2.4 7.2 6.24 2.36 7.2 6.24 0.07 7.2 5.29 0.07 7.2 5.59 0.07 7.2 5.59 0.07 7.2 5.59 4.79 0.7 4.54 0.01 0.001 0.00
NC NC NC NC NC NC NC
(Continued)
30
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
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 46 47 48 49 50 51 52 I2S-DA-IN2 NC RESETQ DACA-R DACA-L VREF-I DACM-R DACM-L DACM-SVB SC2-OUT-R SC2-OUT-L CREF 1 SC1-OVT-R SC1-OUT-L SAPL-A AHVSUP CAPL-M AHVSS ABNDC SC3-ZN-L SC3-IN-R SC2-IN-L SC2-IN-R SC1-IN-L SC1-IN-R VREFTOP WONO-IN AVSS AVSVP ANA-IN1+ ANA-IN1ANA-IN2+ TESTEN XTAL-2N XTAL-OUT NC 0.07 0 4.76 0.8 0.08 0.01 0.17 0.08 0.18 3.82 3.82 0.01 3.82 3.82 7.19 8 7.2 7.2 0.01 3.74 3.77 3.77 3.77 3.77 3.77 2.6 3.78 0.01 4.9 1.53 1.53 0.09 0.01 2.35 2.36 7.3 7 3.5 3.5 0.001 3.5 3.5 3.6 7.1 7.1 0.001 7.1 7.1 7.1 1.3 7.1 7.1 0.001 7.1 7.1 7.1 7.1 7.1 7.1 1.6 7 0.001 0.7 7.3 7.3 7.3 0.001 6.8 6.8 5.31 5.24 3.54 3.52 0.00 3.52 3.54 3.6 5.92 5.91 0.00 5.91 5.92 6.04 4.59 6.04 0.00 6.02 6.1 6.1 6.1 6.1 6.1 6.1 1.63 6.1 0.00 4.53 5.27 5.26 5.27 0.00 5.27 5.3
NC NC
NC NC NC
NC NC NC NC
NC
Table 11 Functions and Service Data of TDA9808T (NQ102)'s Pins
Pin No. 1 2 3 4 5 6 Function Description PIF signal input 1 PIF signal input 2 RFAGC start-control level adjust PLL APC filter Audio AGC filter Audio output (NTSC 4.5MHz) Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 3.23 7.2 6.03 3.23 0.99 2.53 3.29 2.34 7.2 6.7 7.9 7.8 7.2 5.99 5.85 6.3 6.17 5.86
(Continued)
31
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
7 8 9 10 11 12 13 14 15 16 17 18 19 20 Filter 1/2VCC comparison voltage bias Video output Second SIF signal output Second SIF signal input RFAGC output AGC signal output External connection oscillating LC network External connection oscillating LC network Ground AGC filter Supply voltage input terminal SIF signal input SIF signal input for for VCO VCO 1.79 0 2.18 2.03 2.81 0.04 3.05 2.76 2.76 0 3.13 8 3.2 3.2 7.9 7 7 0.001 7.9 2.1 2.1 7 7.6 7.7 5.2 6.09 6.17 4.99 6.1 6.2 6 6 0.00 6.11 2.7 6.27 6.27 7.9 6.29
Table 12 Functions and Service Data of TA1219AN (DS01)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Function Description Get Select Get Select Lin TV RinTV VinTV LinTV1 RinTV1 VinTV1 LinS1 Y/VinS1 RinS1 CinS1 LinS2 Y/VinS2 RinS2 CinS2 I/O1 I/O2 GND Scl SDA Sync out Address VinV2 Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 6.44 3.03 5 5 5 5 5 5 5 5 5 0.04 5 5 4.9 0.04 6.9 0.04 0.01 3.71 3.9 0.2 0.01 5 7.9 7.9 7.5 7.5 7.5 7.6 7.7 7.5 7.5 7.6 7.6 7.6 7.6 7.6 7.6 7.6 7.9 7.9 0.001 6.5 6.9 7.9 0.001 7.65 5.77 5.73 5.89 5.91 5.89 5.89 5.89 5.89 5.89 5.89 5.88 0.00 5.87 5.87 5.86 5.64 5.43 5.44 0.00 4.47 4.46 5.45 0.00 5.81
(Continued)
32
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
25 26 27 28 29 30 31 32 33 34 35 36 LinTV2 Yin RinV2 Vin Vcc Cout Rout1 Yout Lout1 Vout1 RoutTV LoutTV 5 5 5 5 8 3.41 3.89 3.42 3.89 4 3.89 3.89 7.6 7.7 7.6 7.8 4.9 5.2 0.2 7.4 0.2 7.4 0.2 7.4 5.82 5.82 5.82 5.6 4.1 0.2 5.46 0.2 5.46 0.2 5.48 5.48
Table 13 Functions and Service Data of TC90A13N (NK02)'s Pins
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Function Description Bios fos ACD GND for ACD VDD for ACD Bios for ACD Video input Bios for ACD Clamp filter Test terminal Bios for line memory Vco filter Clock input VDD for PLL GND for PLL L:Color; H:B/W mode CBPF VENHO VENH1 IL LINE CORING VDD3 VSS3 BIAS3 Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 1.46 0.01 4.83 3.37 2.22 1.44 3.18 0.01 2.44 1.57 2.25 4.83 0.01 0.07 0.01 0.01 0.01 4.83 0.01 4.82 0.01 3.44 0.4 0.001 0.7 0.7 6.7 6.7 6.7 0.001 5 6.7 6.7 0.6 0.001 6.5 0.001 0.001 0.001 0.7 0.001 0.7 0.001 6.6 0.91 0.78 5.79 5.91 5.92 0.00 4.73 5.92 5.92 0.91 0.00 5.45 0.00 0.00 0.00 0.91 0.00 0.91 0.00 5.91 0.42
(Continued)
33
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
23 24 25 26 27 28 C OUT BIAS2 Y OUT VREF1 VDD4 VSS4 3.83 1.7 3.54 2.88 4.83 0.01 1.2 6.8 1.2 0.7 0.7 0.001 1.39 5.92 1.39 4.89 0.91 0.00
Table 14 Functions and Service Data of MM1031x5 (NK03)'s Pins
Pin No. 1 2 3 4 5 Function Description Video signal amplification Build-in clamp circuit Build-in 75 drive Current consumption Supply voltage Digital Multimeter Positive Resistance Negative Resistance Reference Voltage(V) (20K ) (20K ) 2.08 0.01 0 2.3 4.83 6.7 0.7 5.93 0.91 7 0.001 5.6 0.00
Table 15 Each Electrode Voltage of Key Triodes
Description Serial No. V001 V002 V104 V227 V432 V433 Parts C1851Y C1851Y C388A C1851Y BSN274 BU2720DF Base 0.03 0.13 2.04 2.53 0.550 0 DC Voltage(V) Collector 4.69 4.12 7.87 12.09 26.74 100 Emitter 0.01 0.01 1.28 1.9 0.01 0
34
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
1.OM8839PS(N301) s Pin6, Pin7, Pin8, Pin47,
35
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
2. LC86F3248AU-DIP (N001) s Pin2, Pin3, Pin10, Pin11, Pin20, Pin21, Pin29, Pin30
36
SERVICE MANUAL
IC DATA AND WAVEFORMS OF KEY POINTS (continued)
Pin3,Pin5 Pin8, Pin10,Pin13
Measure with a GOS-622G oscilloscope.
37
SERVICE MANUAL
CIRCUIT ADJUSTMENTS
1. General Description All adjustments are thoroughly checked and corrected before the TV outgoing. Therefore the TV should operate normally and deliver proper colour pictures upon installation. However, several minor adjustments may be required depending on the particular location where the TV is operated. This TV is shipped completely in carton. Carefully take out the TV from the carton and remove all packing materials. Connect the power cord into a 120V AC, 60Hz two-pin power outlet. Turn on the TV. Check and adjust all the customer controls such as brightness, contrast and colour to obtain natural colour pictures. 4. Automatic Degaussing A degaussing coil is mounted around the CRT so that external degaussing after moving the TV is generally unnecessary providing it is properly degaussed upon installation. The degaussing coil operates in about 1 second after power on. If the set is moved or faced to a different direction, the power switch must be switched off for at least 30 minutes in order that the automatic degaussing circuit operates properly. Should the chassis or parts of the cabinet become magnetized to cause poor colour purity, use an external-degaussing coil. Slowly move the degaussing coil around the screen, the sides and front of the TV and slowly withdraw the coil to a distance of about 2m before unplug it. If colour shading still exists, perform the Colour Purity Adjustment and Convergence Adjustment procedures. 3. Supply Voltage Adjustment Caution: +B voltage has close relation to high voltage. To avoid X-ray radiation, +B voltage should be +135V. 1) Set AC power supply to 120±2V. 2) Connect a digital voltmeter to two pins of C845, and then turn on the TV. 3) Receive Philips test pattern signals. 4) The voltmeter should read 135±0.5V. 4. High Voltage Inspection Caution: No high voltage adjustment should be done in the chassis. 1) Connect a precise high voltmeter to the second anode of the CRT. 2) Turn on the TV and set the brightness and contrast to minimum (i.e. set beam current of the CRT to zero). 3) The high voltage tested should be 28.8±0.8KV for 29" and 26.5±0.8KV for 25". 4) Set the brightness to minimum or maximum, and ensure high voltage not beyond limitation of 31KV in any case. 5. Focus Adjustment 1) Use the remote control to set the contrast to maximum and the brightness, chroma to medium. 2) Set H. V. lines near Philips pattern center to thinnest with the FCB on the FBT. After finishing adjustment, ensure that no poor focusing exists near the center or around of the frame.
38
SERVICE MANUAL
CIRCUIT ADJUSTMENTS (continued)
Before Adjusting
SET-UP ADJUSTMENTS
After Adjusting
The following adjustments should be made when a complete realignment is required or a new CRT is installed. Perform the adjustments in order as follows. 1. Colour purity 2. Convergence 5. White Balance Note The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to Fig. 18. 1. Colour Purity Adjustment Note Before attempting any purity adjustment, the TV should be operated for at least 15 minutes. 1 2 3 4 5 Demagnetize the CRT and cabinet using a degaussing coil. Set the brightness and contrast to maximum. Receive the green raster test signals. Loosen the clamp screw holding the deflection yoke and slide it backward or forward to display vertical green belt (zone) on the screen. Remove the rubber wedge. the centre of the screen. 7 8 Slowly move the deflection yoke forward or backward until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily. Check purity of the red and blue raster. Deflection Yoke Rubber Wedge Dummy Wedge 6 Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green belt is on
Adhesive Purity/Convergence Magnet Module Glass Cloth Tapes Deflection Yoke
Fig. 18
39
SERVICE MANUAL
SET-UP ADJUSTMENTS (continued)
6-pole Magnet 4-pole Magnet Adjust the Angle (Vertical Lines) Fixed
Adjustment of Magnets Purity Magnet Convergence Magnet Assembl 2. Convergence Adjustment Note:
Rotate Two Tabs At the Same Time (Horizontal Lines)
Fig. 19
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. Center convergence adjustment 1) Receive the grille test pattern signals. 2) Set the brightness and contrast properly. 3) Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed on the center area of the screen. 4) Turn both tabs at the same time keeping the angle constant to superimpose red and blue horizontal lines on the center of the screen. 5) Adjust two tabs of 6-pole magnet to superimpose red/blue line and green line. Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines. 6) Repeat steps 3) 5) keeping in mind red, green and blue movement. 4-pole magnet and 6-pole magnet interact each other, resulting in complicating and dot movement. Circumference convergence adjustment 1) Loosen the clamping screw of the defection yoke slightly to allow it to tilt. 2) Temporarily put a wedge as shown in Fig.18. (Do not remove cover paper on adhesive part of the wedge.) 3) Tilt front of the deflection yoke up or down to obtain better convergence in circumference. Push the mounted wedge into the space between the CRT and yoke to fix the yoke temporarily. 4) Put other wedge into bottom space and remove the cover paper to stick. 5) Tilt front of the deflection yoke right or left to obtain better convergence in circumference. 6) Keep the deflection yoke position and put another wedge in either upper space. Remove cover paper and stick the wedge on the CRT to fix the yoke. 7) Detach the temporarily mounted wedge and put it in another upper space. Stick it on the CRT to fix the yoke. 8) After fixing three wedges, recheck overall convergence. Tighten the screw firmly to fix the yoke and check if the yoke is fixed.
40
SERVICE MANUAL
SET-UP ADJUSTMENTS (continued)
9) Stick three adhesive tapes on wedges as shown in Fig. 18. BLU Red Red/BLU GRN
BLU Red
Red/BLU GRN
4-pole Magnet Movement
6-pole Magnet Movement
Center Convergence by Convergence Magnets
Incline the Yoke up (or down)
Incline the Yoke Right(or Left)
Circumference Convergence by DEF Yoke
Fig. 20
SERVICE MODE AND BUS DATA
1. To Enter the Service Mode 1) Decrease the volume to 0 with the remote control. 2) Press the MUTE button on the remote control and VIDEO button on the TV at the same time. "S" appears on the TV screen and the TV enters the Service mode. 3) Press the 4) Press the , , or button to adjust data. button on the remote control to exit from the mode.
41
SERVICE MANUAL
SERVICE MODE AND BUS DATA (continued)
Item MENU.00 V.POS /50H H.PHSH /50H V.SIZE /50H V.POS /60H V.PH /60H V.SIZE /60H V.SC V,LINE V.SIZE CMP MENU.01 SUB.BIGHT SUB.CONT V.KILL RF.AGC R.BIAS G.BIAS B.BIAS R.DRIVE G.DRIVE B.DRIVE MENU.02 H.AFC H.BLK.L H.BLK.R CROS.B/W VIDEO.LVL FM.LEVEL MENU.03 FM.MUTE AUDIO.MUTE VIDEO.MUTE SND.TRAP MENU.04 SUB.COLOR SUB.TINT S.SHARP CORING. C.EXT C.BYPASS Symbol Description
VERTICAL POSITION /50Hz HORIZONTAL PHASE /50Hz VERTICAL SIZE /50Hz VERTICAL POSITION /60Hz HORIZONTAL PHASE /60Hz VERTICAL SIZE /60Hz VERTICAL S-CORRECTION VERTICAL LINE VERTICAL SIZE COMPENSATION SUB-BRIGHT SUB-CONTRAST VERTICAL KILL RF AGC RED BIAS GREEN BIAS BLUE BIAS RED DRIVE GREEN DRIVE BLUE DRIVE HORIZONTAL APC GIAN HORIZONTAL BLANKING LEFT HORIZONTAL BLANKING RIGHT CROSSHATCH BLACK/WHITE VIDEO LEVEL FM LEVEL FM MUTE AUDIO MUIE VIDEO MUTE SOUND TRAP SUB COLOR SUB TINT SUB SHARP CORING GAIN EXTERNAL CHROMA CHROMA BAND-PASS BYPASS
Bus Data
34 8 84 37 13 55 4 18 7 59 63 0 15 32 60 16 72 15 93 0 4 4 0 4 1 0 0 0 0 31 24 31 1 0 0
42
SERVICE MANUAL
SERVICE MODE AND BUS DATA (continued)
C.KILL ON MENU.05 BLANK.DEF BLK.ST.DEF FBP.BLK.SW FILT.SYS VOL.FIL VIF.SYS.SW VIDEO.SW MENU.06 R/B ANGLE GREY MODE V.SETUP B.GAM.SEL RG.GAM.DEF MENU.07 BRT.ABL.TH EM.ABL.DEF BRT.ABL.DF MID.STP.DF MENU.08 DIGITAL.OSD OSD.CONT OSD.H.POS MENU.09 H.FREQ C.KILL.OFF AUDIO.SW T.DISBLE OPT.LOGO OPT.VID SW MENU.10 OPT.TV.AV OPT.AV1/2 OPT.AV3 OPT.COLOR OPT.V-CHIP OPT.CCD OPT.CLOCK OPT.P-ON SRCH.SPEED ROM.CORREC COLOR KILL ON BLANK DEFEAT FLYBACK PULSES HORIZONTAL BLANKING SWITCH FILTER SYSTEM SELECT Y/C FILTER MODE VOLUME FILTER VIF SYSTEM SWITCH VIDEO SWITCH R-Y/B-Y ANGLE GREY MODE VERTICAL SETUP 0 0 1 0 0 0 0 0 9 0 1 3 1 7 0 1 1 0 1 22 27 0 0 1 0 0 1
BRIGHT ABL THRESHOLD BRIGHT ABL DEFEAT BRIGHT MID STOP DEFEAT DIGITAL OSD MODE OSD CONTRAST CONTROL OSD HORIZONTAL POSITION HORIZONTAL FREQUENCY COLOR KILL OFF AUDEO SWITCH TEST MODE SWITCH DISABLE OPTION LOGO OPTION VIDEO SWITCH OPTION TV/AV OPTION AV1/2 OPTION AV3 OPTION COLOR OPTION V-CHIP OPTION CCD OPTION CLOCK OPTION P-ON SEARCH SPEED ROM CORRECTION
0 1 1 1 0 0 0
43
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS
1. Power On/Off 1.1 The power indicator lights but with no raster and sound.
1.2 The SMPS has no voltage output.
44
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS(continued)
1.3 The SMPS outputs voltage higher than the rated value.
1.4 The power indicator lights, but the SMPS is still in the Standby mode.
2. Control System 2.1 The power indicator lights, but the CPU cannot enter the Operation mode after power-on again.
45
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS(continued)
2.2 No characters display
2.3 Channel number remains unchanged during auto program.
3. Video Signal Processor 3.1 No color
46
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS(continued)
a. The color is abnormal.
4. Horizontal/Vertical Scan Circuit 4.1 No raster
47
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS(continued)
4.2 Line and field are not sync.
4.3 Raster is displayed as a horizontal bright line on the screen.
48
SERVICE MANUAL
TROUBLESHOOTING FLOW CHARTS(continued)
4.4 The field amplitude of raster is not enough.
5. Audio System 5.1 No sound
49
SERVICE MANUAL
SERVICE SPARE PARTS LIST APPENDIX: 1. CIRCUIT DIAGRAM 2. FINAL WIRING DIAGRAM 3. FINAL ASSEMBLY DIAGRAM 4.PRINTED CIRCUIT BOARD DIAGRAMS
50
APPENDIX 1: CIRCUIT DIAGRAM OF AT3208S (1)
APPENDIX 1: CIRCUIT DIAGRAM OF AT3208S (2)
APPENDIX 2: MAIN PCB OF AT3208S
APPENDIX 2: PCB OF AT3208S CONTROL PCB
AV PCB CRT RGB PCB
APPENDIX 2: POWER PCB OF AT3208S
APPENDIX 3: FINAL WIRING DIAGRAM OF AT3208
Cortrol Buttons PCB Assembly
Power Switch Assembly
Cord Plug KG
XSA03
XPK01
L PCB Assembly
Cord Plug K01
Cord Plug XKW01
Cord Plug K02
XKW01A
XS801
Cord Plug XPA03
From Degaussing Coil
XS802
Main PCB Assembly
XKW01
XSK01
Cord Plug XP804
XS804 XSK02 XP804
XSS01
XS803
XP803
XPY01
Cord Plug XPY01
XS402
To Deflection Yoke
A B
Cord Plug XPS06
Power PCB Assembly
XPS06 XSA02 XSA01
XSY03
XPA01
XPA02
XPA03
XSY01
XPY03
T's G To CR
round
Wire
Cord Plug XPY03
CRT RGB PCB Assembly AV PCB Assembly
+
-
Cord Plug XP803
Power Cord
+
-
APPENDIX 4
£ºFINAL ASSEMBLY OF At3208
or
or
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Serial No.
Soldering agent Tin solder
Q04-3 white nitro magnetic paint
Tapping screw 4X25VwAHCh 8 Tapping screw 4X16BTHCh 4 8 C-1 notched washer I hexagon nut A and B M6 Washer C-UL label Real label C-UL label Real label Admonition label Admonition label Distance clip Wire clip Back cover assembly Front cover assembly CRT assembly Chassis assembly Parts 4 8 1 1 1 1 1 1 1 2 1 1 1 1 Quantity
or
6/24/2003
APEX DIGITAL TELEVISION In-Warranty Schedule by Model
LIMITED WARRANTY 1 Product Model No.
Parts Remote Control Labor CRT
3
Carry-In Service
Yes/No
In Home
Stock Repair
Yes/No
REIMBURSEMENT RATES Carry-In
Minor Major
Yes/No
Home Service
Minor Major
Stock
Repair
13 inch 2 AT1302 AT1308 20 inch AT2002 / AT2002S AT2008 / AT2008S GT2011J GT2011S GT2015 GT2015DV KT2006 24 inch 2&3 AT2402 AT2408 / AT2408S GT2411S GT2415 PF2425 KT2406 25 inch 2 AT2502 AT2502S
2
90 90
90 90
90 90
90 90
N N
N N
N N
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
365 365 365 365 365 365
90 90 90 90 90 90
90 90 90 90 90 90
365 365 365 365 365
N N N N N N N N N N N N N N N N N N 1 YEAR STORE REPLACEMENT
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
365 365 365 365 365 365
90 90 90 90 90 90
90 90 90 90 90 90
365 365 365 365 730 365
N N N N Y
N N N N N
N N N N N
N/A N/A N/A N/A
4
N/A N/A N/A N/A
4
N/A N/A N/A N/A
4
N/A N/A N/A N/A
4
N/A N/A N/A N/A
4
365 365
90 90
90 90
365 365
N N
N N
N N
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
27 inch 3 AT2702 AT2702S AT2708 / AT2708S GT2711S GT2715 PF2725 GT2715DV 32 inch 3 AT3208S GT3215 PF3225 KT3226 PROJECTION GB4308 GB43HD09 GB5108 GB51HD09 GB55HD09W GB65HD09W
1
365 365 365 365 365 365 365
90 90 90 90 90 90 90
90 90 90 90 90 90 90
365 365 365 365 365 730 365
Y Y Y Y Y Y Y
Y Y Y Y Y Y Y
Y Y Y Y Y Y Y
4 4 4 4 4 4 4
4 4 4 4 4 4 4
4 4 4 4 4 4 4
4 4 4 4 4 4 4
4 4 4 4 4 4 4
365 365 365 365
90 90 90 90
90 90 90 90
365 365 730 730
Y Y Y Y
Y Y Y Y
Y Y Y Y
4 4 4 4
4 4 4 4
4 4 4 4
4 4 4 4
4 4 4 4
365 365 365 365 365 365
90 90 90 90 90 90
365 365 365 365 365 365
730 365 730 365 365 365
Y Y Y Y Y Y
Y Y Y Y Y Y
Y Y Y Y Y Y
4 4 4 4 4 4
4 4 4 4 4 4
4 4 4 4 4 4
4 4 4 4 4 4
4 4 4 4 4 4
Limited Warranty is printed on the last page of the owner's manual
2 All defective units 13" - 25 "during the first 90 days of ownership will be exchanged at the original place of purchase. Dealer may contact APEX to receive a Return Authorization from Apex for credit or exchange. 3 Should the picture tube fail during the In-Warranty period the product will be exchanged. The customer is responsible for the Service Center diagnostic fee after the initial labor warranty period and for all packing, transportation and insurance charges. 4 See Master Dealer File for Rates for each Dealer
NOTE: All handling, packing, shipping or freight charges are the responsibility of the customer.
1