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LCD TV
SERVICE MANUAL
CHASSIS : LA92A
MODEL : 22LH20 22LH20-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS
CONTENTS ............................................................................................. 2
PRODUCT SAFETY ................................................................................. 3
SPECIFICATION ....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING .......................................................................... 14
BLOCK DIAGRAM.................................................................................. 20
EXPLODED VIEW .................................................................................. 21
SVC. SHEET ...............................................................................................
Copyright C 2009 LG Electronics. Inc. All right reserved. -2- LGE Internal Use Only
Only for training and service purposes
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
protects the technician from accidents resulting in personal injury between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks. and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation. measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown, 0.5mA.
replace it with the specified. In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor, repaired before it is returned to the customer.
over 1W), keep the resistor 10mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
AC Volt-meter
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical Good Earth Ground
shock. such as WATER PIPE,
To Instrument's CONDUIT etc.
0.15uF
Leakage Current Cold Check(Antenna Cold Check) exposed
METALLIC PARTS
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC 1.5 Kohm/10W
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1M and 5.2M.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Copyright C 2009 LG Electronics. Inc. All right reserved. -3- LGE Internal Use Only
Only for training and service purposes
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service unit under test.
manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES
SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as
NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or
following servicing precautions and any of the safety precautions on exposure of the assembly.
page 3 of this publication, always follow the safety precautions. 3. Use only a grounded-tip soldering iron to solder or unsolder ES
Remember: Safety First. devices.
4. Use only an anti-static type solder removal device. Some solder
General Servicing Precautions removal devices not classified as "anti-static" can generate
1. Always unplug the receiver AC power cord from the AC power electrical charges sufficient to damage ES devices.
source before; 5. Do not use freon-propelled chemicals. These can generate
a. Removing or reinstalling any component, circuit board electrical charges sufficient to damage ES devices.
module or any other receiver assembly. 6. Do not remove a replacement ES device from its protective
b. Disconnecting or reconnecting any receiver electrical plug or package until immediately before you are ready to install it.
other electrical connection. (Most replacement ES devices are packaged with leads
c. Connecting a test substitute in parallel with an electrolytic electrically shorted together by conductive foam, aluminum foil
capacitor in the receiver. or comparable conductive material).
CAUTION: A wrong part substitution or incorrect polarity 7. Immediately before removing the protective material from the
installation of electrolytic capacitors may result in an leads of a replacement ES device, touch the protective material
explosion hazard. to the chassis or circuit assembly into which the device will be
installed.
2. Test high voltage only by measuring it with an appropriate high CAUTION: Be sure no power is applied to the chassis or circuit,
voltage meter or other voltage measuring device (DVM, and observe all other safety precautions.
FETVOM, etc) equipped with a suitable high voltage probe. 8. Minimize bodily motions when handling unpackaged
Do not test high voltage by "drawing an arc". replacement ES devices. (Otherwise harmless motion such as
3. Do not spray chemicals on or near this receiver or any of its the brushing together of your clothes fabric or the lifting of your
assemblies. foot from a carpeted floor can generate static electricity
4. Unless specified otherwise in this service manual, clean sufficient to damage an ES device.)
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable General Soldering Guidelines
non-abrasive applicator; 10% (by volume) Acetone and 90% (by 1. Use a grounded-tip, low-wattage soldering iron and appropriate
volume) isopropyl alcohol (90%-99% strength) tip size and shape that will maintain tip temperature within the
CAUTION: This is a flammable mixture. range or 500°F to 600°F.
Unless specified otherwise in this service manual, lubrication of 2. Use an appropriate gauge of RMA resin-core solder composed
contacts in not required. of 60 parts tin/40 parts lead.
5. Do not defeat any plug/socket B+ voltage interlocks with which 3. Keep the soldering iron tip clean and well tinned.
receivers covered by this service manual might be equipped. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
6. Do not apply AC power to this instrument and/or any of its bristle (0.5 inch, or 1.25cm) brush with a metal handle.
electrical assemblies unless all solid-state device heat sinks are Do not use freon-propelled spray-on cleaners.
correctly installed. 5. Use the following unsoldering technique
7. Always connect the test receiver ground lead to the receiver a. Allow the soldering iron tip to reach normal temperature.
chassis ground before connecting the test receiver positive (500°F to 600°F)
lead. b. Heat the component lead until the solder melts.
Always remove the test receiver ground lead last. c. Quickly draw the melted solder with an anti-static, suction-
8. Use with this receiver only the test fixtures specified in this type solder removal device or with solder braid.
service manual. CAUTION: Work quickly to avoid overheating the circuit
CAUTION: Do not connect the test fixture ground strap to any board printed foil.
heat sink in this receiver. 6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
Electrostatically Sensitive (ES) Devices (500°F to 600°F)
Some semiconductor (solid-state) devices can be damaged easily b. First, hold the soldering iron tip and solder the strand against
by static electricity. Such components commonly are called the component lead until the solder melts.
Electrostatically Sensitive (ES) Devices. Examples of typical ES c. Quickly move the soldering iron tip to the junction of the
devices are integrated circuits and some field-effect transistors and component lead and the printed circuit foil, and hold it there
semiconductor "chip" components. The following techniques only until the solder flows onto and around both the
should be used to help reduce the incidence of component component lead and the foil.
damage caused by static by static electricity. CAUTION: Work quickly to avoid overheating the circuit
1. Immediately before handling any semiconductor component or board printed foil.
semiconductor-equipped assembly, drain off any electrostatic d. Closely inspect the solder area and remove any excess or
charge on your body by touching a known earth ground. splashed solder with a small wire-bristle brush.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
Copyright C 2009 LG Electronics. Inc. All right reserved. -4- LGE Internal Use Only
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair
which the IC leads are inserted and then bent flat against the Excessive heat applied to the copper foil of any printed circuit
circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit
should be used to remove and replace the IC. When working with board causing the foil to separate from or "lift-off" the board. The
boards using the familiar round hole, use the standard technique following guidelines and procedures should be followed whenever
as outlined in paragraphs 5 and 6 above. this condition is encountered.
Removal At IC Connections
1. Desolder and straighten each IC lead in one operation by gently To repair a defective copper pattern at IC connections use the
prying up on the lead with the soldering iron tip as the solder following procedure to install a jumper wire on the copper pattern
melts. side of the circuit board. (Use this technique only on IC
2. Draw away the melted solder with an anti-static suction-type connections).
solder removal device (or with solder braid) before removing the
IC. 1. Carefully remove the damaged copper pattern with a sharp
Replacement knife. (Remove only as much copper as absolutely necessary).
1. Carefully insert the replacement IC in the circuit board. 2. carefully scratch away the solder resist and acrylic coating (if
2. Carefully bend each IC lead against the circuit foil pad and used) from the end of the remaining copper pattern.
solder it. 3. Bend a small "U" in one end of a small gauge jumper wire and
3. Clean the soldered areas with a small wire-bristle brush. carefully crimp it around the IC pin. Solder the IC connection.
(It is not necessary to reapply acrylic coating to the areas). 4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
"Small-Signal" Discrete Transistor copper pattern. Solder the overlapped area and clip off any
Removal/Replacement excess jumper wire.
1. Remove the defective transistor by clipping its leads as close as
possible to the component body. At Other Connections
2. Bend into a "U" shape the end of each of three leads remaining Use the following technique to repair the defective copper pattern
on the circuit board. at connections other than IC Pins. This technique involves the
3. Bend into a "U" shape the replacement transistor leads. installation of a jumper wire on the component side of the circuit
4. Connect the replacement transistor leads to the corresponding board.
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder 1. Remove the defective copper pattern with a sharp knife.
each connection. Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
Power Output, Transistor Device 2. Trace along the copper pattern from both sides of the pattern
Removal/Replacement break and locate the nearest component that is directly
1. Heat and remove all solder from around the transistor leads. connected to the affected copper pattern.
2. Remove the heat sink mounting screw (if so equipped). 3. Connect insulated 20-gauge jumper wire from the lead of the
3. Carefully remove the transistor from the heat sink of the circuit nearest component on one side of the pattern break to the lead
board. of the nearest component on the other side.
4. Insert new transistor in the circuit board. Carefully crimp and solder the connections.
5. Solder each transistor lead, and clip off excess lead. CAUTION: Be sure the insulated jumper wire is dressed so the
6. Replace heat sink. it does not touch components or sharp edges.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Copyright C 2009 LG Electronics. Inc. All right reserved. -5- LGE Internal Use Only
Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application Range 3. Test method
This specification sheet is applied to the LCD TV used LA92A 1) Performance : LGE TV test method followed.
chassis. 2) Demanded other specification
- Safety : UL, CSA, IEC specification
- EMC : FCC, ICE, IEC specification
2. Specification
Each part is tested as below without special appointment
1) Temperature : 25 ± 5°C (77 ± 9ºF), CST : 40 ± 5ºC
2) Relative Humidity : 65 ±10%
3) Power Voltage : Standard input voltage
(100-240V@ 50/60Hz)
* Standard Voltage of each products is marked by models
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
5) The receiver must be operated for about 20 minutes prior to
the adjustment.
4. General Specification(TV)
No. Item Specification Remark
1. Receiving System ATSC/ NTSC-M
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3. Input Voltage 1) 100- 240V~, 50/60Hz Mark : 110V, 60Hz
4. Market NORTH AMERICA
5. Screen Size 22 inch Wide (1366 x 768)
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module LC220WXE-TBA1
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : 0 ~ 85 %
Copyright C 2009 LG Electronics. Inc. All right reserved. -6- LGE Internal Use Only
Only for training and service purposes
5. Chroma & Brightness
No Item Min. Typ. Max. Unit Remark
1 Max Luminance 280 350 cd/m2
(Center 1-point / Full White Pattern)
2 White average brightness cd/m2 N/A
3 Luminance uniformity 77 % Full white
4 Color coordinate RED X 0.642 ± 0.03
Y 0.333 ± 0.03
GREEN X 0.295 ± 0.03
Y 0.608 ± 0.03
BLUE X 0.147 ± 0.03
Y 0.063 ± 0.03
WHITE X 0.285 ± 0.03
Y 0.293 ± 0.03
6 Contrast ratio 700:1 1000:1
6000:1 8000:1(DCR)
7 Color Temperature Cool 0.283 0.285 0.287 ** The W/B Tolerance is
0.291 0.293 0.295 ±0.015 for Adjustment
Medium 0.293 0.295 0.297
0.303 0.305 0.307
Warm 0.311 0.313 0.315
0.327 0.329 0.331
6. Component Video Input (Y, CB/PB, CR/PR)
Specification
No. Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock
1. 720*480 15.73 60 13.5135 SDTV ,DVD 480I
2. 720*480 15.73 59.94 13.5 SDTV ,DVD 480I
3. 720*480 31.50 60 27.027 SDTV 480P
4. 720*480 31.47 59.94 27.0 SDTV 480P
5. 1280*720 45.00 60.00 74.25 HDTV 720P
6. 1280*720 44.96 59.94 74.176 HDTV 720P
7. 1920*1080 33.75 60.00 74.25 HDTV 1080I
8. 1920*1080 33.72 59.94 74.176 HDTV 1080I
9. 1920*1080 67.500 60 148.50 HDTV 1080P
10. 1920*1080 67.432 59.939 148.352 HDTV 1080P
11. 1920*1080 27.000 24.000 74.25 HDTV 1080P
12. 1920*1080 26.97 23.976 74.176 HDTV 1080P
13. 1920*1080 33.75 30.000 74.25 HDTV 1080P
14. 1920*1080 33.71 29.97 74.176 HDTV 1080P
Copyright C 2009 LG Electronics. Inc. All right reserved. -7- LGE Internal Use Only
Only for training and service purposes
7. RGB input (PC)
No. Specification
Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz)
PC DDC
1 640*350 31.469 70.08 25.17 DOS X
2 720*400 31.469 70.08 28.32 DOS O
3 640*480 31.469 59.94 25.17 VESA(VGA) O
4 800*600 37.879 60.31 40.00 VESA(SVGA) O
5 1024*768 48.363 60.00 65.00 VESA(XGA) O
6 1280*768 47.776 59.87 79.50 CVT(WXGA) X
7 1360*768 47.720 59.799 84.75 CVT(WXGA) O
8 1366*768 47.13 59.65 72 X
8. HDMI input (PC/DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*350 31.469 70.08 25.17 EGA X
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 720*400 37.879 60.31 40.00 VESA(SVGA) O
5. 1024*768 48.363 60.00 65.00 VESA(XGA) O
6. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
7. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
DTV
1 720*480 31.5 60 27.027 SDTV 480P
2 720*480 31.47 59.94 27.00 SDTV 480P
3 1280*720 45.00 60.00 74.25 HDTV 720P
4 1280*720 44.96 59.94 74.176 HDTV 720P
5 1920*1080 33.75 60.00 74.25 HDTV 1080I
6 1920*1080 33.72 59.94 74.176 HDTV 1080I
7 1920*1080 67.500 60 148.50 HDTV 1080P
8 1920*1080 67.432 59.939 148.352 HDTV 1080P
9 1920*1080 27.000 24.000 74.25 HDTV 1080P
10 1920*1080 26.97 23.976 74.176 HDTV 1080P
11 1920*1080 33.75 30.000 74.25 HDTV 1080P
12 1920*1080 33.71 29.97 74.176 HDTV 1080P
Copyright C 2009 LG Electronics. Inc. All right reserved. -8- LGE Internal Use Only
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Object 4. Automatic Adjustment
This specification sheet applied to LA92A Chassis applied 4.1. ADC Adjustment
LCD TV all models manufactured in TV factory. (1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use (2) Equipment & Condition
an isolation transformer. However, the use of isolation 1) Jig (RS-232C protocol)
transformer will help protect test equipment. 2) MSPG-925 Series Pattern Generator(MSPG-925FA)
(2) Adjustments must be done in the correct order. - Resolution : 480i Comp1 (MSPG-925FA: model-209,
(3) The adjustments must be performed in the circumstance of pattern-65)
20±5°C of temperature and 65±10% of relative humidity if 1024*768 RGB (MSPG-925FA: model-60 , pattern-65)
there is no specific designation. - Pattern : Horizontal 100% Color Bar Pattern
(4) The input voltage of the receiver be must kept 100V-240V, - Pattern level : 0.7±0.1 Vp-p
50/60Hz when adjusting. - Image
(5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15.
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below -
20°C, it should be placed in the circumstance of above
15°C for 3 hours,. (3) Adjustment
1) Adjustment method
Caution : When still image is displayed for a period of 20 - Using RS-232, adjust items listed in 3.1 in the other
minutes or longer (especially where W/B scale is strong. shown in "4.1.3.3"
Digital pattern 13ch and/or Cross hatch pattern 09ch), 2) Adj. protocol
there can some afterimage in the black level area. Protocol Command Set ACK
Enter adj. mode aa 00 00 a 00 OK00x
Source change xb 00 40 b 00 OK40x (Adjust 480i Comp1 )
3. Adjustment items xb 00 60 b 00 OK60x (Adjust 1024*768 RGB)
3.1. Main PCB check process Begin adj. ad 00 10
- Adjust 480i Comp1 Return adj. result OKx (Case of Success)
- Adjust 1024*768 RGB
NGx (Case of Fail)
Above adjustment items can be also performed in Final Read adj. data (main) (main)
Assembly if needed. Both Board-level and Final assembly ad 00 20 000000000000000000000000007c007b006dx
adjustment items can be check using In-Star Menu 1.ADJUST
CHECK. (sub) (Sub)
ad 00 21 000000070000000000000000007c00830077x
Confirm adj. ad 00 99 NG 03 00x (Fail)
3.2. Final assembly adjustment NG 03 01x (Fail)
- EDID/DDC download
- White Balance adjustment NG 03 02x (Fail)
- RS-232C functionality check OK 03 03x (Success)
- Factory Option setting per destination
End adj. aa 00 90 a 00 OK90x
- Ship-out mode setting (In-Stop)
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3.3 Etc 3) Adj. order
- Ship-out mode - aa 00 00 [Enter ADC adj. mode]
- Service Option Default - xb 00 40 [Change input source to Component1(480i)]
- USB Download(S/W Update, Option, Service only) - ad 00 10 [Adjust 480i Comp1]
- ISP Download(Option) - xb 00 60 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1024*768 RGB]
- ad 00 90 End adj.
Copyright C 2009 LG Electronics. Inc. All right reserved. -9- LGE Internal Use Only
Only for training and service purposes
(2) Confirmation · ADC 1024*768 RGB
1) We confirm whether "0xBF(480i)/0xC8(1080i)" address 1) Check connected condition of Component & RGB
of EEPROM "0xA2" is "0xAA" or not. cable to the equipment
2) If "0xBF(480i)/0xC8(1080i)" address of EEPROM "0xA2" 2) Give a 1024*768 Mode, 100% Horizontal Color Bar
isn't "0xAA", we adjust once more. Pattern to RGB port.
3) We can confirm the ADC values from "0xB ~0xBE(480i)/ (MSPG-925 Series Ë model:60 , pattern:65 )
0xC2~(1080i)" addresses in a page "0xA2". 3) Change input mode as RGB and picture mode as
"Standard"
* Manual ADC Confirmation using Service Remocon. After 4) Press the In-start Key on the ADJ remote after at least
enter Service Mode by pushing "INSTART" key. 1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, "ADC RGB Success"
5. Manual Adjustment is displayed.
If ADC calibration is failure, "ADC RGB Fail" is
5.1. ADC(Saturn5) Adjustment displayed.
(1) Overview 6) If ADC calibration is failure, after recheck ADC pattern
ADC adjustment is needed to find the optimum black level or condition retry calibration
and gain in Analog-to-Digital device and to compensate Error message refer to 5)
RGB deviation.
5.2. EDID(The Extended Display Identification
(2) Equipment & Condition
1) Adjust Remocon Data)/DDC(Display Data Channel) download
2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern Reference : Download is only possible in POWER ONLY
Generator MODE
- Resolution: 480i, 1024*768
- Pattern : Horizontal 100% Color Bar Pattern (1) Overview
- Pattern level: 0.7±0.1 Vp-p It is a VESA regulation. A PC or a MNT will display an
- Image optimal resolution through information sharing without any
necessity of user input. It is a realization of "Plug and Play".
(2) Equipment
- Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need.
- Adjust remocon
(3)Download method
1) Press Adj. key on the Adj. R/C,
3) Must use standard cable 2) Select EDID D/L menu.
3) By pressing Enter key, EDID download will begin
(3) Adjust method 4) If Download is successful, OK is display, but If
Download is failure, NG is displayed.
· ADC 480i Comp1 5) If Download is failure, Re-try download.
1) Check connected condition of Comp1 cable to the
equipment Caution) When EDID download, must remove RGB/HDMI cable.
2) Give a 480i Mode, Horizontal 100% Color Bar Pattern
to Comp1.
(MSPG-925FA Ë Model: 209, Pattern: 65)
3) Change input mode as Component1 and picture mode
as "Standard"
4) Press the In-start Key on the ADJ remote after at least
1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, "ADC RGB Success"
is displayed.
If ADC calibration is failure, "ADC RGB Fail" is
displayed.
6) If ADC calibration is failure, after recheck ADC pattern
or condition retry calibration. Error message refer to (v)
Copyright C 2009 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only
Only for training and service purposes
(4) EDID DATA 5.3. White Balance Adjustment
1) HDMI 1 [C/S: XXEF] (1) Overview
- EDID Block 0 table = · W/B adj. Objective & How-it-works
0 1 2 3 4 5 6 7 8 9 A B C D E F - Objective: To reduce each Panel's W/B deviation
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 - How-it-works: When R/G/B gain in the OSD is at 192, it
10 XX XX 01 03 80 73 41 78 0A CF 74 A3 57 4C B0 23 means the panel is at its Full Dynamic
20 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01 Range. In order to prevent saturation of
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70 Full Dynamic range and data, one of
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20 R/G/B is fixed at 192, and the other two is
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39 lowered to find the desired value.
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC - Adj. condition : normal temperature
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 XX 1) Surrounding Temperature: 25±5ºC
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
- EDID Block 1 table =
0 1 2 3 4 5 6 7 8 9 A B C D E F (2) Equipment
0 02 03 1F F1 47 10 22 20 05 84 03 02 26 15 07 50 1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12)
10 09 07 07 67 03 0C 00 10 00 B8 2D E3 05 03 01 02 2) Adj. Computer(During auto adj., RS-232C protocol is
20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00 needed)
30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42 3) Adjust Remocon
40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E 4) Video Signal Generator MSPG-925F 720p/216-Gray
50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 (Model:217, Pattern:78)
60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1F 40 30 -> Only when internal pattern is not available
70 20 25 00 7E 8A 42 00 00 1A 00 00 00 00 00 00 FF
· Color Analyzer Matrix should be calibrated using CS-1000
2) HDMI 2 [C/S: XXDF] (3) Equipment connection MAP
- EDID Block 0 table =
0 1 2 3 4 5 6 7 8 9 A B C D E F Co lo r Analyzer
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 Probe RS -232C
10 XX XX 01 03 80 73 41 78 0A CF 74 A3 57 4C B0 23 Co m p ut er
20 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01 RS -232C
RS -232C
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
Pat t ern Generat o r
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20
Signal Source
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39
* If TV internal pattern is used, not needed
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 XX Connection Diagram of Automatic Adjustment
(4) Adj. Command (Protocol)
- EDID Block 1 table = 1) RS-232C Command used during auto-adj.
0 1 2 3 4 5 6 7 8 9 A B C D E F
RS-232C COMMAND
0 02 03 1F F1 47 10 05 84 03 02 07 06 26 15 07 50
Meaning
10 09 07 07 6B 03 0C 00 20 00 B8 2D E3 05 03 01 02 [CMD ID DATA]
20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00
wb 00 00 Begin White Balance adj.
30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42
40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E wb 00 ff End White Balance adj.(Internal pattern disappeared)
50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1B 40 30 Ex) wb 00 00 -> Begin white balance auto-adj.
70 20 25 00 7E 8A 42 00 00 1A 00 00 00 00 00 00 EF wb 00 10 -> Gain adj.
ja 00 ff -> Adj. data
jb 00 c0
3) RGB [C/S: XX] ...
- EDID Block 0 table = ...
0 1 2 3 4 5 6 7 8 9 A B C D E F wb 00 1f -> Gain adj. complete
0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 *(wb 00 20(start), wb 00 2f(end)) -> Off-set adj.
10 XX XX 01 03 68 73 41 78 0A CF 30 A3 57 4C B0 23 wb 00 ff -> End white balance auto adj.
20 09 50 4E A1 08 00 81 C0 01 01 01 01 01 00 01 01
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 XX
* Address 10/11 and 7F means Manufacture Week and
Checksum. So this data will be change.
Copyright C 2009 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only
Only for training and service purposes
2) Adjustment Map * Adj. condition and cautionary items
1) Lighting condition in surrounding area
ITEM Command Data Range Default Surrounding lighting should be lower 10 lux. Try to
(Hex.) (Decimal) isolate adj. area into dark surrounding.
Cmd 1 Cmd 2 Min Max 2) Probe location
Cool R-Gain j g 00 C0 - LCD: Color Analyzer (CA-210) probe should be
G-Gain j h 00 C0
within 10cm and perpendicular of the module
surface (80°~ 100°)
B-Gain j i 00 C0
3) Aging time
R-Cut - After Aging Start, Keep the Power ON status during 5
G-Cut Minutes.
B-Cut - In case of LCD, Back-light on should be checked
Medium R-Gain j a 00 C0 using no signal or Full-white pattern.
G-Gain j b 00 C0
(6) Reference (White Balance Adj. coordinate and color
B-Gain j c 00 C0
temperature)
R-Cut · Luminance: 216 Gray
G-Cut · Standard color coordinate and temperature using CS-
B-Cut 1000 (over 26 inch)
Warm R-Gain j d 00 C0 Mode Color Coordination Temp UV
G-Gain j e 00 C0
x y
B-Gain j f 00 C0
COOL 0.276 0.283 11000K 0.0000
R-Cut
G-Cut MEDIUM 0.285 0.293 9300K 0.0000
WARM 0.313 0.329 6500K 0.0000
(5) Adj. method
· Auto adj. method · Standard color coordinate and temperature using CA-
1) Set TV in adj. mode using POWER ON key 210(CH 9)
2) Zero calibrate probe then place it on the center of the
Mode Color Coordination Temp UV
Display
3) Connect Cable(RS-232C) x y
4) Select mode in adj. Program and begin adj. COOL 0.276±0.002 0.283±0.002 11000K 0.0000
5) When adj. is complete (OK Sing), check adj. status pre
MEDIUM 0.285±0.002 0.293±0.002 9300K 0.0000
mode (Warm, Medium, Cool)
6) Remove probe and RS-232C cable to complete adj. WARM 0.313+0.002 0.329±0.002 6500K 0.0000
* W/B Adj. must begin as start command "wb 00 00", and
finish as end command "wb 00 ff", and Adj. offset if
need 5.4. HDCP SETTING
- HDCP setting is not necessary in Saturn5 model.
· Manual adj. method
1) Set TV in Adj. mode using POWER ON
2) Zero Calibrate the probe of Color Analyzer, then place
it on the center of LCD module within 10cm of the 5.5 Option selection per country
surface.. (1) Overview
3) Press ADJ key -> EZ adjust using adj. R/C > 6. White- - Option selection is only done for models in Non-USA
Balance then press the cursor to the right (KEYG). North America due to rating
(When KEY(G) is pressed 216 Gray internal pattern - Applied model: LA92A Chassis applied None USA
will be displayed) model(CANADA, MEXICO)
4) One of R Gain / G Gain / B Gain should be fixed at
192, and the rest will be lowered to meet the desired (2) Method
value. 1) Press ADJ key on the Adj. R/C, then select Country
5) Adj. is performed in COOL, MEDIUM, WARM 3 modes Group Menu
of color temperature. 2) Depending on destination, select KR or US, then on the
lower Country option, select US, CA, MX. Selection is
- If internal pattern is not available, use RF input. In EZ done using +, - KEY
Adj. menu 6.White Balance, you can select one of 2
Test-pattern: ON, OFF. Default is inner(ON). By
selecting OFF, you can adjust using RF signal in 216
Gray pattern.
Copyright C 2009 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only
Only for training and service purposes
5.6. Tool Option selection 7. USB S/W Download (option)
· Method: Press Adj. key on the Adj. R/C, then select Tool (1) Put the USB Stick to the USB socket
option. (2) Automatically detecting update file in USB Stick
Model Tool 1 Tool 2 Tool 3 Tool 4 Menu - If your downloaded program version in USB Stick is Low,
it didn't work.
32LH20 16449 1572 932 1024 2 HDMI, CAN Tuner But your downloaded version is High, USB data is
automatically detecting
(3) Show the message "Copying files from memory"
5.7. Ship-out mode check (In-stop)
· After final inspection, press In-Stop key of the Adj. R/C and
check that the unit goes to Stand-by mode.
· After final inspection, Always turn on the Mechanical S/W.
6. GND and Internal Pressure check
6.1. Method
1) GND & Internal Pressure auto-check preparation
- Check that Power Cord is fully inserted to the SET.
(If loose, re-insert)
2) Perform GND & Internal Pressure auto-check
- Unit fully inserted Power cord, Antenna cable and A/V (4) Updating is staring.
arrive to the auto-check process.
- Connect D-terminal to AV JACK TESTER
- Auto CONTROLLER(GWS103-4) ON
- Perform GND TEST
- If NG, Buzzer will sound to inform the operator.
- If OK, changeover to I/P check automatically.
(Remove CORD, A/V form AV JACK BOX)
- Perform I/P test
- If NG, Buzzer will sound to inform the operator.
- If OK, Good lamp will lit up and the stopper will allow the
pallet to move on to next process.
6.2. Checkpoint
· TEST voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
· TEST time: 1 second
· TEST POINT
- GND TEST = POWER CORD GND & SIGNAL CABLE
METAL GND
- Internal Pressure TEST = POWER CORD GND & LIVE &
NEUTRAL
· LEAKAGE CURRENT: At 0.5mArms
(5) Updating Completed, The TV will restart automatically
(6) If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)
* If downloading version is more high than your TV have,
TV can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn't
have a DTV/ATV test on production line.
* After downloading, have to adjust TOOL OPTION again.
1) Push "IN-START" key in service remote controller.
2) Select "Tool Option 1" and Push "OK" button.
3) Punch in the number. (Each model has their number.)
Copyright C 2009 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only
Only for training and service purposes
TROUBLESHOOTING
1. Power-up boot check
No OK OK
Check stand-by Voltage. Check Power connector.
Check Fuse. Replace Power board.
P700 8pin : +5V_ST and AC S/W on?
OK
No
Check X100 clock
Replace X100.
12MHz
OK
No OK
Check P700 PWR_ON.
Re-download software. Replace Mstar(IC100) or Main board
2pin : 5V
OK
No
Check Q706 output level
Replace Q706
5V
OK
No *20V Voltage is dependent on model.
Check Multi Voltage.
Replace Power board. 32/36LH20, 32LH30 => 24V
P700 13pin : 12V, 18pin : *20V
19/22LH20 => 15V(pin1 or 2)
OK
Check inverter control & error No
P700 22pin : Low Check Power board or Module.
P700 20pin : high
OK
No
Check IC704 output voltage Replace IC704.
3.3V
OK
No
Check Mstar LVDS output
Replace Mstar(IC100) or Main board.
R812, R813,..., R821
Copyright C 2009 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only
Only for training and service purposes
2. Digital TV Video