LG 32LT670H-UA User manual

Printed in KoreaP/NO : MFL67449109 (1207-REV00)
CHASSIS : LA2AF
MODEL : 32LT670H 32LT670H-UA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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

- 2 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ................................................................................. 3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ................................................................ 6
TROUBLESHOOTING.............................................................................16
BLOCK DIAGRAM.................................................................................. 22
EXPLODED VIEW .................................................................................. 23
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

- 3 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
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

- 4 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
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 Commercial LCD TV with LA2AE/F
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, 64 & 256 QAM
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 32 inch Wide (1366 X 768) HD +60Hz 32LT670H-UA
6 Aspect Ratio 16:9
7 Tuning System FS
8 Module T320XVN01.1 LGD 32LT670H-UA
9 Operating
Environment
1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10 Storage
Environment
1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %

- 5 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. RGB (PC)
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed DDC
1 640*350 31.468 70.09 25.17 EGA Х
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 59.870 79.5 CVT(WXGA) Х
7 1360*768 47.712 60.015 85.50 VESA (WXGA) Х
6. HDMI Input
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed
PC DDC
1 640*350 31.468 70.09 25.17 EGA Х
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 59.870 79.5 CVT(WXGA) Х
7 1360*768 47.712 60.015 85.50 VESA (WXGA) O
DTV
1 720*480 31.47 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

- 6 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LA2E/F 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 Board Level Adjustment
(1) Adjust RGB (ADC)
(2) EDID/DDC download
● 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.
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)
3.3. Etc
(1) Shipment conditions
(2) Service Option Default
(3) USB Download (S/W Update, Option and Service only)
(4) ISP Download (Optional)
4. Board Level Adjustment
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 (Inner Pattern)
- Resolution : 1024*768 RGB (Inner Pattern)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
4.1.3. Adjustment
4.1.3.1. Adjustment method
- Using RS-232, adjust items listed in 3.1 in the other shown
in “4.1.3.3”
4.1.3.2. Adj. protocol
Ref.) ADC Adj. RS232C Protocol_Ver1.0
4.1.3.3. Adj. order
▪aa 00 00 [Enter ADC adj. mode]
▪xb 00 40 [Change input source to Component1(1080i)]
▪ad 00 10 [Adjust 480i Comp1]
▪xb 00 60 [Change input source to RGB(1024*768)]
▪ad 00 10 [Adjust 1024*768 RGB]
▪ad 00 90 End adj.
Protocol Command Set ACK
Enter adj. mode aa 00 00 a 00 OK00x
Source change xb 00 40
xb 00 40
b 00 OK40x (Adjust 1080i Comp1 )
b 00 OK60x (Adjust 1024*768 RGB)
Begin adj. ad 00 10
Return adj. result OKx (Case of Success)
NGx (Case of Fail)
Read adj. data (main)
ad 00 20
(sub )
ad 00 21
(main)
000000000000000000000000007c007b006dx
(Sub)
000000070000000000000000007c00830077x
Conrm adj. ad 00 99 NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
End adj. aa 00 90 a 00 OK90x

- 7 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. Manual Adjustment
5.1. ADC Adjustment
5.1.1. Overview
▪ ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate RGB
deviation
5.1.2. Equipment & Condition
(1) Adjust Remocon
(2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern
Generator
- Resolution : 480i Comp1 (MSPG-925FA: model-209,
pattern-65)
- Resolution : 1024*768 RGB (Inner Pattern)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level: 0.7±0.1 Vp-p
- Image
- or Inner pattern
(3) Must use standard cable
5.1.3. Adjust method
5.1.3.1. ADC RGB
(1) Press the In-start Key on the ADJ remote after at least 1
min of signal reception. Then, select ADC Calibration. And
Press OK Button on the menu “Start”. The adjustment will
start automatically.
(2) If ADC RGB is successful, “ADC RGB Success” is
displayed and ADC RGB is completed.
If ADC calibration is failure, “ADC RGB Fail” is displayed.
(3) If ADC calibration is failure, after rechecking ADC pattern
or condition, retry calibration
5.2. EDID/DDC Download(EDID PCM)
5.2.1. 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”.
5.2.2. Equipment
(1) Adjust remocon.
(2) Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need
5.2.3. 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.
5.2.4. EDID DATA
5.2.4.1. North America
(1) FHD Model - 8Bit
■ HDMI 1-FHD-10BIT (C/S : 989B)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
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 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 10 00 B8 2D E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 9B
■ HDMI 2-FHD-10BIT (C/S : 988B)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
EDID Block 1, Bytes 128-255 [80H-FFH]
0 1 2 3 4 5 6 7 8 9 A B C D E F
-------------------------------------------------------------------------------
02 03 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 20 00 B8 2D E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 8B

- 8 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
■ HDMI 3-FHD-10BIT (C/S : 987B)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
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 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 30 00 B8 2D E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 7B
■ RGB-FHD (C/S : B1)
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 81 80 61 40 45 40 31 40 01 01
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 B1
(2) 8Bit
■ HDMI 1-FHD-8BIT (C/S : 98E2)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
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 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 10 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 E2
■ HDMI 2-FHD-8BIT (C/S : 98D2)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
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 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 20 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 D2
■ HDMI 3-FHD-8BIT (C/S : 98C2)
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 81 80 61 40 45 40 31 40 01 01
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 39
60 | 3F 1F 52 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 98
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 1C F1 47 90 22 20 05 04 03 02 23 09 57 07
10 | 67 03 0C 00 30 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 C2

- 9 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
■ RGB-FHD (C/S : B1)
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 81 80 61 40 45 40 31 40 01 01
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 B1
(3) HD Model
■ HDMI 1-HD (C/S : 1AE2)
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 CF 74 A3 57 4C B0 23
20 | 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 40 84 63 00 00 1E 01 1D 00 72 51 D0 1E 20
50 | 6E 28 55 00 40 84 63 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 01 1A
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 1C F1 47 10 22 20 05 84 03 02 23 09 57 07
10 | 67 03 0C 00 10 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 E2
■ HDMI 2-HD (C/S : 1AD2)
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 CF 74 A3 57 4C B0 23
20 | 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 40 84 63 00 00 1E 01 1D 00 72 51 D0 1E 20
50 | 6E 28 55 00 40 84 63 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 01 1A
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 1C F1 47 10 22 20 05 84 03 02 23 09 57 07
10 | 67 03 0C 00 20 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 D2
■ HDMI 3-HD (C/S : 1AC2)
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 CF 74 A3 57 4C B0 23
20 | 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01
30 | 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 | 36 00 40 84 63 00 00 1E 01 1D 00 72 51 D0 1E 20
50 | 6E 28 55 00 40 84 63 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 01 1A
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 1C F1 47 10 22 20 05 84 03 02 23 09 57 07
10 | 67 03 0C 00 30 00 80 1E E3 05 03 01 02 3A 80 18
20 | 71 38 2D 40 58 2C 04 05 40 84 63 00 00 1E 01 1D
30 | 80 18 71 1C 16 20 58 2C 25 00 40 84 63 00 00 9E
40 | 01 1D 00 72 51 D0 1E 20 6E 28 55 00 40 84 63 00
50 | 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 00 40 84
60 | 63 00 00 18 26 36 80 A0 70 38 1F 40 30 20 25 00
70 | 40 84 63 00 00 1A 00 00 00 00 00 00 00 00 00 C2
■ RGB-HD (C/S : 6E)
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 CF 30 A3 57 4C B0 23
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 40 84 63 00 00 1E 01 1D 00 72 51 D0 1E 20
50 | 6E 28 55 00 40 84 63 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 6E

- 10 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. Final Assembly Adjustment
6.1. White Balance Adjustment
6.1.1. Overview
6.1.1.1. 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
6.1.1.2. 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.
6.1.2. 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
6.1.3. Equipment connection MAP
6.1.4. 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 )
Ex) wb 00 00 -> Begin white balance auto-adj.
wb 00 10 -> Gain adj.
ja 00 ff -> Adj. data
jb 00 c0
...
...
wb 00 1f -> Gain adj. complete
*(wb 00 20(start), wb 00 2f(end)) -> Off-set adj.
wb 00 ff ->End white balance auto adj
(2) Adjustment Map
Applied Model : 26/32/37/42LT670H-UA
Adj. item
Command
(lower case ASCII)
Data Range
(Hex.)
Default
(Decimal)
CMD1 CMD2 MIN MAX 172
Cool R Gain j g 00 C0 172
G Gain j h 00 C0 192
B Gain j i 00 C0 64
R Cut 64
G Cut 64
B Cut 192
Medium R Gain j a 00 C0 192
G Gain j b 00 C0 192
B Gain j c 00 C0 64
R Cut 64
G Cut 64
B Cut 192
Warm R Gain j d 00 C0 192
G Gain j e 00 C0 172
B Gain j f 00 C0 64
R Cut 64
G Cut 64
Color Analyzer
Computer
Pattern Generator
※
Signal Source
Probe
RS-232C
RS-232C
RS-232C
※
If TV internal pattern is used, not needed

- 11 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6.1.5. Adjustment method
6.1.5.1 Auto adj. method
(1) Set TV in adj. mode using POWER ONLY (P-ONLY) key
(2) Zero calibrate probe then place it on the center of the
Display
(3) Connect Cable(RS-232C)
(4) Select mode in adj. Program and begin adj.
(5) When adj. is completed (OK Sing), check adj. status of pre
mode (Cool, Medium, Warm)
(6) Remove probe and RS-232C cable to complete adj.
▪ W/B Adj. must begin as start command “wb 00 00” , and
finish as end command “wb 00 ff”, and Adj. offset if need
6.1.5.2. 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.
▪ If internal pattern is not available, use RF input. In EZ 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 204 Gray pattern.
▪ 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.
6.1.6. Reference (White Balance Adj. coordinate and
color temperature)
▪ Luminance: 204 Gray, 80IRE
** LGD Module (over 26inch)
▪ Standard color coordinate and temperature using
CA-210(CH 14)
Mode Coordinate Temp △uv Remark
X Y
Cool 0.269±0.002 0.273±0.002 13,000K 0.0000 26/32/37/
42LT670H-UA
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
▪ 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
▪ Standard color coordinate and temperature using
CA-210(CH 14) – by aging time
(1) Edge LED models (applied only LGD Module) in LGERS
GP3 Aging time
(Min)
Cool Medium Warm
X Y X Y X Y
269 273 285 293 313 329
1 0-2 279 288 295 308 319 338
2 3-5 278 286 294 306 318 336
3 6-9 277 285 293 305 317 335
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
(2) Edge LED models (applied only LGD Module) in LGEKR
(GUMI) (wintertime)
GP3 Aging time
(Min)
Cool Medium Warm
X Y X Y X Y
269 273 285 293 313 329
1 0-2 281 293 297 313 321 343
2 3-5 280 290 296 310 320 340
3 6-9 279 289 295 309 319 339
4 10-19 277 286 293 306 317 333
5 20-35 275 282 291 302 315 332
6 36-49 273 278 289 298 313 328
7 50-79 271 276 287 296 311 326
8 80-149 270 274 286 294 310 324
9 Over 150 269 273 285 293 309 323

- 12 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6.2. Option selection per country
6.2.1. Overview
(1) Option selection is only done for models in Non-USA North
America due to rating
(2) Applied model: LA2AE/F Chassis is applied in USA
6.2.2. Method
(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
6.2.3. Tool Option inspection
▪ Press Adj. key on the Adj. R/C, then select Tool option.
Model Tool 1 Tool 2 Tool 3 Tool 4 Tool 5 COM-
MERCIAL
OPTION
37LT670H-UA 16389 2338 9489 17324 36 1618 LGD
42LT670H-UA 16390 2338 9489 21420 36 1618 LGD
32LT670H-UA 16388 2321 9489 17324 36 1618 LGD
26LT670H-UA 16387 290 9489 17324 36 1618 LGD
6.2.4. 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
7. GND and HI-POT Test
7.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
7.2. 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.
7.3. 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
8. AUDIO output check
8.1. 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)
8.2. Specification
● Measurement 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

- 13 - 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.)
10. Conditions ST_BY Consumption
Power
- Have to turn-off ST_BY Light
- USA 110V / 60Hz, KOREA 220V / 60Hz
(Menu -> Option -> Power Indicator -> ST_BY Light : OFF)
11. Test factor for commercial model
11.1. RJP TEST
{Picture1}
11.1.1. Overview
▪ Jig(Commercial Check JIG)
▪ Power only mode
11.1.2. Test sequence
(1) Connect the adapter to the Commercial check Jig for
supplying voltage
(2) Turn on the TV and fix the channel to 96-1
(3) Adjust each switch on left side to; adapter and 5V
(4) Turn on JIG pin No. 5. as picture 1
(5) Press the P-ONLY key for Encryption channel check
(6) Press the EXIT key
(7) Check to confirm the encryption channel
(8) Connect the LAN Cable
(9) Check “RJP TEST : OK” message.
(4) Updating is staring.

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
12. External Speaker Out
(1) Connect external speaker to speaker out port with phone
jack on TV side as below
(2) Check the Max. speaker output is 1W or not. Sine wave
with 1KHz will be displayed
(3) Check Both of the signal in speaker.
(only Power -> Fived 1W Default)
-> Check the input signal(1KHZ, Sine wave) and the wave
of output by utilizing oscilloscope.
13. LAN Main board Check
13.1. Overview
It is LNET RF modem & FTG card
13.2. Equipment
(1) b_LAN Checker: UTC-1000 (with Cable accessory)
(2) Computer(for test result monitoring)
(3) Connection JIG
13.3. Equipment connection map & b_LAN
Check
Recommended Input Signal
: RF, 1kHz, Sine wave

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
13.4. Check
13.4.1. Setting Procedure
13.4.1.1. Setting JIG
(1) Connect UTC-1000 Equipment to JIG device as a like left
picture
- Connection Line:
UTC-1000 TOP1<- ->Game port(RJ21)
-> TV-LINK CFG (Phone Jack)
UTC-1000 TOP2<- ->JIG 11pin Connection
UTC-1000 RF1<- ->b_LAN RF IN
UTC-1000 LAN<- ->PC LAN Port
13.4.1.2. Working procedure
(1) Connection
UTC-1000 LAN <- -> PC LAN Port
UTC-1000 TOP1 <- -> Game port(RJ21)
-> TV-LINK CFG (Phone Jack)
UTC-1000 RF1 <- -> b_LAN RF IN
(2) Power on JIG : Switch on front of the JIG
(3) Test Start
UTC-1000 TOP2 <- -> JIG 11pin Connection
(4) Checking b-LAN MAC Address
Check whether it is same their address numbers or not
between B-LAN Label and on the pc address numbers.
● Checking JIG contents
(1) Check whether displaying all “Pass” or not at the number
3.4.6.7.9 contents of UTC-1000 on the PC
(2) Check “Version 6.0” of the 1. b_LAN Application version
(3) Check whether it is same their address numbers or not
between B-LAN Label and
(4) MAC Address on the pc.
14. Serial number download
Connect Bar Code scan equipment and TV set by RS-232C
cable
(1) E2PROM Data Write
(2) E2PROM Data Read

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLESHOOTING
Power-Up Boot Fail Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check Q409 output Voltage(12V)
Y
Check LVDS Cable
Y
Check LCD Module
Control board
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check Q409 application circuit
Or replace Q409
N
Replace Cable
N
No OSD Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check IC5002 RESET and
UPDATE pin
Y
Check X5000 Clock
32.768MHz
Y
Check IC5002 IIC
Communication status
Y
Check IR input state of IC5002
57pin
Y
Re-download PTC Micom
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check switch SW5000, SW5001
N
Check X5000 application circuit
or Replace X5000
Check IIC line or replace IC5002
Check IR board
N
N
N

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Analog RF Video Trouble Shooting guide
Check RF cable & signal
Y
Check TU3001 Pin7
(Video output)
Y
Check tuner 5V power L3000
Y
Check tuner 3.3V power L3001
Y
Check tuner 1.8V power IC3000
2pin : 1.8V
Y
Check Mstar LVDS output
Replace Tuner.
N
Check IC5000
Replace L3001
Replace IC3000
N
N
N
Replace IC101
N
Replace IC5000
N
Y

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Digital RF Trouble Shooting guide
Check RF cable & signal
Check tuner 5V power L3000
Y
Check IIC Signal
TU3001 Pin#3,4
Y
Check DIF Signal
TU3001 Pin#10,11
Y
Check X201
and application circuit
Check IC5000
Replace TU3001
Replace TU3001
N
N
N
Replace IC101
N
Replace IC5000
N
Y
Replace X201

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Composite Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C217 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK1700
N
HDMI Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800/JK801/JK802
Can you see the normal waveform?
Y
Check HDCP key NVRAM(IC103)
Power & I2C signal
Y
Check the input of Mstar(IC101).
Measure waveform at R4024, R4025 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK800, JK801, JK802
N
Replace IC103
N

- 20 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
RGB-PC Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check P900
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at R4025, R4042 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace P900
N
Analog RF Audio Trouble Shooting guide
Check RF cable & signal
Check TU3001 Pin1
(SIF output)
Y
Check Audio AMP output
L503,L504,L505,L506
Y
Check IC501
Y
Check C250
(SIF signal to IC101)
Replace Tuner
N
Replace L503,L504,L505,L506
Replace IC501
N
N
Replace IC101
Y