LG 42LM3700 User manual

Printed in KoreaP/NO : MFL67402845 (1208-REV00)
CHASSIS : LA21B
MODEL : 42LM3700 42LM3700-UC
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
LED LCD TV
SERVICE MANUAL
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ................................................................................. 3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING............................................................................15
BLOCK DIAGRAM.................................................................................. 23
EXPLODED VIEW .................................................................................. 24
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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Only for training and service purposes
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
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
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
shock.
Leakage Current Cold Check(Antenna Cold Check)
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
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 1 MΩand 5.2 MΩ.
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.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

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Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This spec sheet is applied LCD TV with LA21B/C chassis
2. Test condition
Each part is tested as below without special notice.
1) Temperature : 25 ºC ± 5 ºC (77 ºF ± 9 ºF), CST : 40 ºC±5 ºC
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
: Standard input voltage (AC 110-240 V~, 50/60 Hz)
* 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 5 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : UL, CSA, IEC specification
- EMC: FCC, ICES, IEC specification
4. General Specification
No Item Specication Remark
1 Receiving System 1) 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) AC 100 ~ 240V 50/60Hz Mark : 110V, 60Hz (N.America)
4 Market NORTH AMERICA
5 Screen Size 42 inch Wide (1920 × 1080) FHD + 60Hz
6 Aspect Ratio 16:9
7 Tuning System FS
8 Module Direct LED LC320DXN-SEU2 LGD 32LM3400-UC
LC420DUN-SEU2 LGD 42LM3400-UC / 42LM3700-UC
9 Operating
Environment
1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10 Storage
Environment
1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %

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5. Component Video Input (Y, Cb/Pb, Cr/Pr)
6. RGB (PC)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1 720*480 15.73 60.00 13.5135 SDTV ,DVD 480I
2 720*480 15.73 59.94 13.50 SDTV ,DVD 480I
3 720*480 31.50 60.00 27.027 SDTV 480P
4 720*480 31.47 59.94 27.00 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 67.50 60.00 148.50 HDTV 1080P
10 1920*1080 67.432 59.94 148.352 HDTV 1080P
11 1920*1080 27.00 24.00 74.25 HDTV 1080P
12 1920*1080 26.97 23.94 74.176 HDTV 1080P
13 1920*1080 33.75 30.00 74.25 HDTV 1080P
14 1920*1080 33.71 29.97 74.176 HDTV 1080P
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed DDC Remark
1 640*350 31.468 70.09 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
4 800*600 37.879 60.31 40.00 VESA(SVGA) O
5 1024*768 48.363 60.00 65.00 VESA(XGA) O
6 1152*864 54.348 60.053 VESA O
7 1360*768 47.712 60.015 85.50 VESA (WXGA) O
8 1920*1080 66.587 59.934 138.5 WUXGA O Full HD model Only

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7. HDMI Input
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
PC (DVI) DDC
1 640*350 31.468 70.09 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
4 800*600 37.879 60.31 40.00 VESA(SVGA) O
5 1024*768 48.363 60.00 65.00 VESA(XGA) O
6 1152*864 54.348 60.053 VESA O
7 1280*1024 63.981 60.020 108.0 VESA (SXGA) O Full HD model Only
8 1360*768 47.712 60.015 85.50 VESA (WXGA) O
9 1920*1080 67.50 60.00 148.5 HDTV 1080P O Full HD model Only
DTV
1 720*480 31.47 60.00 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 67.50 60.00 148.50 HDTV 1080P
8 1920*1080 67.432 59.94 148.352 HDTV 1080P
9 1920*1080 27.00 24.00 74.25 HDTV 1080P
10 1920*1080 26.97 23.976 74.176 HDTV 1080P
11 1920*1080 33.75 30.00 74.25 HDTV 1080P
12 1920*1080 33.71 29.97 74.176 HDTV 1080P

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Only for training and service purposes
8. 3D Mode (LM5800//LM4600/ CM565 models)
8.1. RF 3D Input(DTV)
8.3. HDMI Input(1.3)
- Connect the HDMI cable & receiving the HDMI signal
- Press “3D” key of remote control & select 3D format below.
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 3D input proposed mode
1 1280*720 89.9 / 90 59.94/60 148.35/148.5 HDTV 720P Frame packing (720 60p)
2 1280*720 45 60 74.25 HDTV 720P Side by Side(half), Top & Bottom
3 1920*1080 53.95 / 54 23.98 / 24 148.35/148.5 HDTV 1080P Frame packing (1080 24p)
4 1920*1080 67.5 60 148.5 HDTV 1080P Side by Side(half), Top & bottom
5 1920*1080 33.7 60 74.25 HDTV 1080i Side by Side(half), Top & Bottom
6 1920*1080 27 24 74.25 HDTV 1080P Side by Side(half), Top & Bottom
7 1920*1080 33.7 30 74.25 HDTV 1080P Side by Side(half), Top &Bottom
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode
1 1280*720 45.00 60.00 74.25 HDTV 720P Side by Side, Top & Bottom
2 1920*1080 33.75 60.00 74.25 HDTV 1080I Side by Side, Top & Bottom
3 1920*1080 27.00 24.00 74.25 HDTV 1080P Side by Side, Top & Bottom
4 1920*1080 33.75 30.00 74.25 HDTV 1080P Side by Side, Top & Bottom
5 1920*1080 67.50 60.00 148.5 HDTV 1080P Side by Side, Top & Bottom,
Single Frame Sequential
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode
1 1280*720 37.5 50 74.25 HDTV 720P Side by Side, Top & Bottom
2 1920*1080 28.125 50 74.25 HDTV 1080I Side by Side, Top & Bottom
8.2. HDMI Input (V1.4a)
- When connect the cable on TV or change the input mode, 3D display on automatically
- Display OSD information -> 1920x2205 [1080p 24], 1280x1470 [720p 60]

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8.6. 3D Input mode
8.5. RGB-PC Input
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode
1 1920*1080 66.587 59.93 138.625 HDTV 1080P Side by Side, Top & Bottom
No. Side by Side Top & Bottom Single Frame Sequential Frame Packing
1
8.4. USB Input
(1) Movie
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 3D input proposed mode Proposed
1 1920*1080 33.75 30 74.25 Side by Side HDTV 1080P
Top & Bottom
(2) MPO Picture 3D : when selecting the MPO file, Automatically 3D on
(3) 3D Demo in store mode
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 3D input proposed mode
1 1920*1080 33.75 30.00 74.25 HDTV 1080P Side by Side
R
L
R
LLLLL
L
R
L
8.7. DLNA
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1 1920*1080 33.75 30 74.25 HDTV 1080P Side by Side, Top & Bottom

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ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LA21B/C Chassis applied LCD TV
all models manufactured in TV factory.
2. Specification
(1) Because this is not a hot chassis, it is not necessary to
use an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
25 ±5 °C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input voltage of the receiver must keep 100~240V,
50/60Hz.
(5) At first Worker must turn on the SET by using Power Only
key.
(6) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15 °C
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.
[Caution]
When still image is displayed for a period of 20 minutes or
longer (especially where W/B scale is strong.
Digital pattern 13ch and/or Cross hatch pattern 09ch), there
can some afterimage in the black level area
3. Adjustment items
3.1. Main PCBA Adjustments
(1) ADC adjustment: Component 480i, 1080p / RGB-PC
1080p
(2) EDID download: HDMI and RGB-PC
● Above adjustment items can be also performed in Final
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Start Menu (1.
Adjust Check). Component 1080p and RGB-PC Adjust will
be calculated by 480i adjust value.
3.2. Final assembly adjustment
(1) White Balance adjustment
(2) RS-232C functionality check
(3) Factory Option setting per destination
(4) Shipment mode setting (In-Stop)
(5) GND and HI-POT test
3.3. Appendix
(1) Shipment conditions
(2) Tool option menu
(3) USB Download (S/W Update, Option and Service only)
(4) Preset CH Information
4. MAIN PCBA Adjustments
4.1. ADC Adjustment
4.1.1. Overview
▪ ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate RGB
deviation.
4.1.2. Equipment & Condition
(1) Protocol: RS-232C
(2) Inner Pattern
- Resolution : 1080p(Comp) / 1024*768(RGB)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
4.1.3. Adjustment
4.1.3.1. Adjustment method
- Connect to Jig by using RS-232, adjust Component and
RGB
● Manual adj (If needed in Final Assembly)
- Required equipment : Adjustment R/C
- Enter Service Mode by pushing “ADJ” key,
- Enter Internal ADC mode by pushing ‘►’ key at [6. ADC
Calibration]
4.1.3.2. Adj. protocol
- Connect to Jig by using RS-232, adjust Component and
RGB
Protocol CMD 1 CMD 2 Data 1 Data 2 Remark
Enter
adj
mode
a a 00 00 When
transfer
the ‘Mode
In’,Carry the
command.
Start
ADC adj
a d 00 10 Automatically
adjustment
(Use internal
pattern)

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4.2. EDID Download
4.2.1. Overview
- It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”.
4.2.2. Equipment
(1) Since EDID data is embedded, EDID download JIG, HDMI
cable and D-sub cable are not need.
(2) Adjust by using remote controller.
4.2.3. Download method
(1) Press Adj. key on the Adj. R/C.
(2) Select EDID D/L menu.
(3) By pressing Enter key, EDID download will begin
(4) If Download is successful, OK is display, but If Download is
failure, NG is displayed.
(5) If Download is failure, Re-try downloads.
[Caution] : When EDID Download, must remove RGB/HDMI
Cable.
4.2.4. EDID DATA
4.2.4.1. North America (PCM)
(1) FHD Model - 8Bit
■ HDMI 1-FHD-8BIT (C/S : E9CF)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-----------------------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 16 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 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 E9
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-------------------------------------------------------------------------------
0 | 02 03 19 F1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 67 03 0C 00 10 00 80 1E 02 3A 80 18 71 38 2D
20 | 40 58 2C 04 05 40 84 63 00 00 1E 01 1D 80 18 71
30 | 1C 16 20 58 2C 25 00 40 84 63 00 00 9E 01 1D 00
40 | 72 51 D0 1E 20 6E 28 55 00 40 84 63 00 00 1E 8C
50 | 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84 63 00 00
60 | 18 26 36 80 A0 70 38 1F 40 30 20 25 00 40 84 63
70 | 00 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 CF
■ HDMI 2-FHD-8BIT (C/S : E9BF)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
------------------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 16 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 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 E9
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
--------------------------------------------------------------------------------
0 | 02 03 19 F1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 67 03 0C 00 20 00 80 1E 02 3A 80 18 71 38 2D
20 | 40 58 2C 04 05 40 84 63 00 00 1E 01 1D 80 18 71
30 | 1C 16 20 58 2C 25 00 40 84 63 00 00 9E 01 1D 00
40 | 72 51 D0 1E 20 6E 28 55 00 40 84 63 00 00 1E 8C
50 | 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84 63 00 00
60 | 18 26 36 80 A0 70 38 1F 40 30 20 25 00 40 84 63
70 | 00 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 BF
■ HDMI 3-FHD-8BIT (C/S : E9AF)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-------------------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 16 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 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 E9
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-------------------------------------------------------------------------------
0 | 02 03 19 F1 48 90 22 20 05 04 03 02 01 23 09 57
10 | 07 67 03 0C 00 30 00 80 1E 02 3A 80 18 71 38 2D
20 | 40 58 2C 04 05 40 84 63 00 00 1E 01 1D 80 18 71
30 | 1C 16 20 58 2C 25 00 40 84 63 00 00 9E 01 1D 00
40 | 72 51 D0 1E 20 6E 28 55 00 40 84 63 00 00 1E 8C
50 | 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84 63 00 00
60 | 18 26 36 80 A0 70 38 1F 40 30 20 25 00 40 84 63
70 | 00 00 1A 00 00 00 00 00 00 00 00 00 00 00 00 AF
■ RGB-FHD (C/S : 02)
EDID Block 0, Bytes 0-127 [00H-7FH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-------------------------------------------------------------------------------------
0 | 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01
10 | 01 16 01 03 68 A0 5A 78 0A EE 91 A3 54 4C 99 26
20 | 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80
30 | 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 | 45 00 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30
50 | 40 70 36 00 40 84 63 00 00 1E 00 00 00 FD 00 3A
60 | 3E 1E 53 10 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 02

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5. Final Assembly Adjustment
5.1. White Balance Adjustment
5.1.1. Overview
5.1.1.1. W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel’s W/B deviation
(2) How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic Range. In order to
prevent saturation of Full Dynamic range and data, one of
R/G/B is fixed at 192, and the other two is lowered to find
the desired value.
(3) Adj. condition: normal temperature
- Surrounding Temperature: 25±5 ºC
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
- Before White balance adjustment, Keep power on status,
don’t power off
5.1.1.2. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
- After Aging Start, Keep the Power ON status during 5
Minutes.
- In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
5.1.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-Gray
(Model:217, Pattern:49)
→ Only when internal pattern is not available
※Color Analyzer Matrix should be calibrated using
CS-1000
5.1.3. Equipment connection
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj
RS-232C COMMAND Explanation
CMD DATA ID
Wb 00 00 Begin White Balance adj.
Wb 00 ff End White Balance adj.
(internal pattern disappears )
(2) Adjustment Map
Adj. item
Command
(lower case ASCII)
Data Range
(Hex.)
Default
(Decimal)
CMD1 CMD2 MIN MAX
Cool R Gain j g 00 C0
G Gain j h 00 C0
B Gain j i 00 C0
R Cut
G Cut
B Cut
Medium R Gain j a 00 C0
G Gain j b 00 C0
B Gain j c 00 C0
R Cut
G Cut
B Cut
Warm R Gain j d 00 C0
G Gain j e 00 C0
B Gain j f 00 C0
R Cut
G Cut
Color Analyzer
Computer
Pattern Generator
※
Signal Source
Probe
RS-232C
RS-232C
RS-232C
※
If TV internal pattern is used, not needed

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5.1.5. Adjustment method
5.1.5.1. Auto WB calibration
(1) Set TV in ADJ mode using P-ONLY key (or POWER ON
key)
(2) Place optical probe on the center of the display
- It need to check probe condition of zero calibration before
adjustment.
(3) Connect RS-232C Cable
(4) Select mode in ADJ Program and begin a adjustment.
(5) When WB adjustment is completed with OK message,
check adjustment status of pre-set mode (Cool, Medium,
Warm)
(6) Remove probe and RS-232C cable.
※W/B Adj. must begin as start command “wb 00 00” , and
finish as end command “wb 00 ff”, and Adj. offset if need.
5.1.5.2. 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 surface..
(3) Press ADJ key -> EZ adjust using adj. R/C -> 6. White-
Balance then press the cursor to the right (KEY►).
(When KEY(►) is pressed 204 Gray(80IRE) internal
pattern will be displayed)
(4) One of R Gain / G Gain / B Gain should be fixed at 192,
and the rest will be lowered to meet the desired value.
(5) Adj. is performed in COOL, MEDIUM, WARM 3 modes of
color temperature.
5.1.6. Reference (White Balance Adj. coordinate and
color temperature)
▪ Luminance: 204 Gray, 80IRE
** Lamp Module
▪ Standard color coordinate and temperature using CS-1000
(over 26 inch)
Mode Coordinate Temp △uv
X Y
Cool 0.269 0.273 13,000K 0.0000
Medium 0.285 0.293 9,300K 0.0000
Warm 0.313 0.329 6,500K 0.0000
▪ Standard color coordinate and temperature using
CA-210(CH 14)
Mode Coordinate Temp △uv
X Y
Cool 0.269±0.002 0.273±0.002 13,000K 0.0000
Medium 0.285±0.002 0.293±0.002 9,300K 0.0000
Warm 0.313±0.002 0.329±0.002 6,500K 0.0000
** Only Edge-LED OS(AUO,CMI,IPS,Sharp) Module except
AUO 65”
▪ Standard color coordinate and temperature using CS-1000
(over 26 inch)
Mode Coordinate Temp △uv
X Y
Cool 0.271 0.276 13,000K 0.0000
Medium 0.287 0.296 9,300K 0.0000
Warm 0.315 0.332 6,500K 0.0000
▪ Standard color coordinate and temperature using
CA-210(CH 14)
Mode Coordinate Temp △uv
X Y
Cool 0.271±0.002 0.276±0.002 13,000K 0.0000
Medium 0.287±0.002 0.296±0.002 9,300K 0.0000
Warm 0.315±0.002 0.332±0.002 6,500K 0.0000
** Only Edge-LED LGD Module
▪ Standard color coordinate and temperature using
CA-210(CH-14) – by aging time
GP3 Aging time
(Min)
Cool Medium Warm
X Y X Y X Y
269 273 285 293 313 329
1 0-2 280 287 296 307 320 337
2 3-5 279 286 295 305 319 335
3 6-9 277 284 292 304 317 334
4 10-19 276 283 292 303 316 333
5 20-35 274 280 290 300 314 330
6 36-49 272 277 288 297 312 327
7 50-79 271 275 287 295 311 325
8 80-149 270 274 286 294 310 324
9 Over 150 269 273 285 293 309 323

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5.2. Option selection per country
5.2.1. Overview
(1) Tool option selection is only done for models in Non-USA
North America due to rating
(2) Applied model: LA02D and LA02E Chassis applied to
CANADA and MEXICO
5.2.2. Country Group selection
(1) Press ADJ key on the Adj. R/C, and then select Country
Group Menu
(2) Depending on destination, select KR or US, then on the
lower Country option, select US, CA, MX.
Selection is done using +, - KEY
5.2.3. Tool Option inspection
▪ Press Adj. key on the Adj. R/C, then select Tool option.
Model Module Tool 1 Tool 2 Tool 3 Tool 4 Tool 5
32LM3400-UC LGD 16820 375 10523 13228 6176
42LM3400-UC LGD 16822 375 10523 13228 6176
42LM3700-UC LGD 16982 375 10523 13228 6176
47LM4700-UE LGDCI 33319 2423 10523 29612 7170
55LM4700-UE LGDCI 33321 2423 10523 29612 7170
47LM4700-UE LGD 33319 2423 10523 29612 7362
55LM4700-UE LGD 33321 2423 10523 29612 7362
6. GND and HI-POT Test
6.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
6.2. GND & HI-POT auto-check
(1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test).
(Remove A/V CORD from A/V JACK BOX)
(5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next process
automatically.
6.3. Checkpoint
(1) Test voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
(2) TEST time: 1 second
(3) TEST POINT
- GND Test = POWER CORD GND and SIGNAL CABLE GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEUTRAL.
(4) LEAKAGE CURRENT: At 0.5mArms
7. AUDIO output check
7.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
(3) RGB PC: 1KHz sine wave signal (0.7Vrms)
7.2. Specification
No Item Min Typ Max Unit Remark
1 Audio
practical
max Output,
L/R
9.0
8.5
10.0
8.9
12.0
9.9
W
Vrms
(1) Measurement
condition
- EQ/AVL/Clear
Voice: Off
(2) Speaker (8Ω
Impedance)
8. EYE-Q Check
Step 1) Turn on the TV..
Step 2) Press 'EYE button' on the adjustment remote-
controller.
Step 3) Cover 'Eye Q sensor' on the front of set with your
hands, hold it for 6 seconds.
Step 4) Check "the Sensor Data" on the screen, make certain
that Data is below 10. If Data isn’t below 10 in 6
seconds, Eye Q sensor would be bad. You should
change Eye Q sensor.
Step 5) Uncover your hands from Eye Q sensor, hold it for 6
seconds.
Step 6) Check "Back Light(xxx)" on the screen, check data
increase . You should change Eye Q sensor.
<Step 2>
<Step 5> <Step 6>
<Step 3>
<Step 4>

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
9. USB S/W Download
(optional, Service only)
(1) Put the USB Stick to the USB socket
(2) Automatically detecting update file in USB Stick
- If your downloaded program version in USB Stick is lower
than that of TV set, it didn’t work. Otherwise USB data is
automatically detected.
(3) Show the message “Copying files from memory”
(5) Updating Completed, The TV will restart automatically
(6) If your TV is turned on, check your updated version and
Tool option.
* 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, TOOL OPTION setting is needed 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.)
(4) Updating is staring.

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST Check Power connector Main B/D 3.5V Line
Short Check
Check X201 clock
24 MHz Replace X201
Check P403 PWR_ON.
1pin : 3.3V
Replace Mstar(IC101) or Main board
Check Multi Voltage
P403 2pin:24V ,17pin:12V
Replace Power Board
Check Inverter Control & Error Out
P403 18 pin : High
P403 24 pin : low
Check Power Board or Module
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.1V
IC407 : 1.5V
Q403 : 3.3V
Replace IC402/3/7, Q403
Re-download software.
Check Micom Voltage
L404 : +3.5V Replace L404
Check LVDS Power Voltage
Q409 : 12V Replace Q409
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
okNo
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703 Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3704 10/11 Pin
Replace IC3703
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703 Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check CVBS Signal
TU3704 8 Pin
Replace IC3703 .
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. AV Video
5. Component Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK1601, CVBS Signal Line
L1603
ok
ok
ok
No Replace Jack
ok
Check CVBS_DET Signal Replace R1600
No
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
No
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1603 or JK1602 or JK1601
Y/PB/PR signal Line
ok
ok
ok
No Replace Jack
Check COMP_DET Signal Replace R1612 or R1613
No
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
ok
No

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
R1138, R1139(SDA,SCL)
Check JK1104
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
re-download EDID data ,Replace Mstar(IC101) or Main Board
ok
Replace Jack
Check DSUB_DET Replace R1146 or R1147
No
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
ok
No

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
R884,R8 I2C Signal
Check JK801, JK802, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
Check HDCP EEPROM(IC103)
Power & I2C Signal Replace the defective IC.
ok
No
Replace Jack
Check HDMI Signal Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output Replace Mstar(IC101) or Main Board.
ok
No
Replace Main Board
No
Check HDMI_DET(HPD) No
ok
Replace R830,R828,R862

- 20 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P501
1, 2, 3, 4 pin. Replace Audio AMP IC(IC501)
ok
No
Check Connector & P501 Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage. Replace speaker.
ok
No
Off Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No Replace Amp IC(IC501)
Check Mstar I2S Output
IC501 9,10,11 Pin
No Check signal line. Or replace Mstar(IC101)
Check Mstar AUDIO_MASTER_CLK
R148
No Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R140, R141
No Check signal line. Or replace Mstar(IC101)