LG 42LV375H User manual

LED LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LD03X
MODEL : 42LV375H 42LV375H-ZA
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
Printed in KoreaP/NO : MFL63263134 (1105-REV00)

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CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ................................................................ 7
TROUBLE SHOOTING GUIDE................................................................14
BLOCK DIAGRAM.................................................................................. 20
EXPLODED VIEW .................................................................................. 21
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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SAFETY PRECAUTIONS
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 MΩ and 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
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
IMPORTANT SAFETY NOTICE
0.15 uF
Ω

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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to the LCD TV used LD03X
chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
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 100-240 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 : CE, IEC specification
- EMC :CE, IEC
4. Module General Specification
No. Item Specification Remark
1 Display Screen Device 107 cm(42 inch) wide color display module
2 Aspect Ratio 16:9
3 LCD Module 107 cm(42 inch) TFT LCD FHD 50 Hz
4 Operating Environment Temp. : 0 deg ~ 50 deg
Humidity : 10 % ~ 90 %
5 Storage Environment Temp. : -20 deg ~ 60 deg
Humidity : 10 ~ 90 %
6 Input Voltage AC 100-240 V~, 50 / 60 Hz
7 Power Consumption Power on (White)
LGD Typ : 91.3 LCD (Module) + Backlight(EDGE LED)
8 Module Size 968.4(H) x 564(V) x 10.8(B)/18.3 mm(D) With inverter
9 Pixel Pitch 0.4845 mm x 0.4845 mm
10 Back Light EDGE LED
11 Display Colors 16.7 M colors
12 Coating 3H(Hard coating), AG

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5. Module optical specification
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable in a dark environment at 25 ºC ± 2 ºC.
3) Operating Ambient Humidity : Min 10, max 90 %RH
4) Ta= 25 ºC ± 2 ºC, VLCD= 12.0 V, fV= 60 Hz
No. Item Specification Min. Typ. Max. Remark
1. Viewing Angle<CR>10> Right/Left/Up/Down 89 CR > 10
2. Luminance Luminance (cd/m2) 290 360
Variation - 1.3 MAX /MIN
3. Contrast Ratio CR 1000 1400
4. CIE Color Coordinates White Wx 0.279
Wy 0.292
RED Rx 0.637
Ry Typ. 0.341 Typ.
Green Gx -0.03 0.325 +0.03
Gy 0.600
Blue Bx 0.152
By 0.051
6. Component Video Input (Y, CB/PB, CR/PR)
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz)
1. 720x480 15.73 60.00 SDTV,DVD 480i
2. 720x480 15.63 59.94 SDTV,DVD 480i
3. 720x480 31.47 59.94 480p
4. 720x480 31.50 60.00 480p
5. 720x576 15.625 50.00 SDTV,DVD 625 Line
6. 720x576 31.25 50.00 HDTV 576p
7. 1280x720 45.00 50.00 HDTV 720p
8. 1280x720 44.96 59.94 HDTV 720p
9. 1280x720 45.00 60.00 HDTV 720p
10. 1920x1080 31.25 50.00 HDTV 1080i
11. 1920x1080 33.75 60.00 HDTV 1080i
12. 1920x1080 33.72 59.94 HDTV 1080i
13. 1920x1080 56.250 50 HDTV 1080p
14. 1920x1080 67.5 60 HDTV 1080p

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No. Specification Proposed Remarks
Resolution H-freq(kHz) V-freq(Hz) Pixel Clock(MHz)
1. 720*400 31.468 70.08 28.321 For only DOS mode
2. 640*480 31.469 59.94 25.17 VESA Input 848*480 60 Hz, 852*480 60 Hz
-> 640*480 60 Hz Display
3. 800*600 37.879 60.31 40.00 VESA
4. 1024*768 48.363 60.00 65.00 VESA(XGA)
5. 1280*768 47.78 59.87 79.5 WXGA
6. 1360*768 47.72 59.8 84.75 WXGA
7. 1280*1024 63.595 60.0 108.875 SXGA FHD model
8. 1920*1080 66.587 59.93 138.625 WUXGA FHD model
7. RGB (PC)
8. HDMI Input
(1) DTV Mode
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*400 31.468 70.08 28.321 HDCP
2. 640*480 31.469 59.94 25.17 VESA HDCP
3. 800*600 37.879 60.31 40.00 VESA HDCP
4. 1024*768 48.363 60.00 65.00 VESA(XGA) HDCP
5. 1280*768 47.78 59.87 79.5 WXGA HDCP
6. 1360*768 47.72 59.8 84.75 WXGA HDCP
7. 1280*1024 63.595 60.0 108.875 SXGA HDCP/FHD model
8. 1920*1080 67.5 60.00 138.625 WUXGA HDCP/FHD model
(2) PC Mode
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1. 720*480 31.469 /31.5 59.94 /60 27.00/27.03 SDTV 480P
2. 720*576 31.25 50 54 SDTV 576P
3. 1280*720 37.500 50 74.25 HDTV 720P
4. 1280*720 44.96 /45 59.94 /60 74.17/74.25 HDTV 720P
5. 1920*1080 33.72 /33.75 59.94 /60 74.17/74.25 HDTV 1080I
6. 1920*1080 28.125 50.00 74.25 HDTV 1080I
7. 1920*1080 26.97 /27 23.97 /24 74.17/74.25 HDTV 1080P
8. 1920*1080 33.716 /33.75 29.976 /30.00 74.25 HDTV 1080P
9. 1920*1080 56.250 50 148.5 HDTV 1080P
10. 1920*1080 67.43 /67.5 59.94 /60 148.35/148.50 HDTV 1080P

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ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LCD TV with
LD03X chassis.
2. Designation
(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 ºC ± 5 ºC of temperature and 65 % ±10 % of relative
humidity if there is no specific designation.
(4) The input voltage of the receiver must keep AC 100-240
V~, 50 / 60Hz.
(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.
[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. Automatic Adjustment
3.1. ADC Adjustment
(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) Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA,
pattern - 65)
- Resolution : 480i Comp1
1080p Comp1
1080p RGB
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7 ± 0.1 Vp-p
- Image
(3) Adjustment
1) Adjustment method
- Using RS-232, adjust items in the other shown in
“3.1.(3).3)”
2) Adj. protocol
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3) Adj. order
- aa 00 00 [Enter ADC adj. mode]
- xb 00 40 [Change input source to Component1(No action)]
- ad 00 10 [Adjust 480i Comp1]
- ad 00 10 [Adjust 1080p Comp1]
- xb 00 60 [Change input source to RGB(No action)]
- ad 00 10 [Adjust 1080p RGB]
- ad 00 90 End adj.
3.2. MAC Address
(1) Equipment & Condition
- Play file: Serial.exe
- MAC Address edit
- Input Start / End MAC address
(2) Download method
1) Communication Prot connection
Connect: PCBA Jig-> RS-232C Port== PC-> RS-232C Port
PCBA PC(RS-232C)
RS-232C Po rt
Protocol Command Set ACK
Enter adj. mode aa 00 00 a 00 OK00x
Source change xb 00 40 b 00 OK40x (Adjust 480i, 1080p Comp1 )
xb 00 60 b 00 OK60x (Adjust 1920*1080 RGB)
Begin adj. ad 00 10
Return adj. result OKx (Case of Success)
NGx (Case of Fail)
Read adj. data (main) (main : component1 480i, RGB 1080p)
ad 00 20 000000000000000000000000007c007b006dx
(main) (main : component1 1080p)
ad 00 30 000000070000000000000000007c00830077x
Confirm 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

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2) MAC Address Download
- Com 1,2,3,4 and 115200(Baud rate)
- Click “Port connection” button(1).
- Click “Load” button(2) for MAC Address write.
- Click “MAC Address write” button(3)
- Check the OK Or NG.
3.3. LAN
(1) Equipment & Condition
AEach other connection to LAN Port of IP Hub and Jig
(2) LAN inspection solution
ALAN Port connection with PCB
ANetwork setting at MENU Mode of Installation Menu
- “In-start” key input -> “menu” key input -> Installation
Menu
- Network Setup -> Network Setting --> Press “Enter” ->
IP Auto Setting -> OK
Asetting automatic IP
ASetting state confirmation
-> If automatic setting is finished, you confirm IP and
MAC Address.
3.4. LAN PORT INSPECTION(PING TEST)
Connect SET -> LAN port == PC -> LAN Port
(1) Equipment setting
1) Play the LAN Port Test PROGRAM.
2) Input IP set up for an inspection to Test Program.
*IP Number : 12.12.2.2
(2) LAN PORT inspection (PING TEST)
1) Play the LAN Port Test Program.
2) Connect each other LAN Port Jack.
3) Play Test (F9) button and confirm OK Message.
4) Remove LAN cable.
3.5. Model name & serial number download
(1) Model name & Serial number D/L
APress “Power on” key of service remote control.
(Baud rate : 115200 bps)
AConnect RS232 Signal Cable to RS-232 Jack.
AWrite Serial number by use RS-232.
AMust check the serial number at Instart menu.
(2) Method & notice
A. Serial number D/L is using of scan equipment.
B. Setting of scan equipment operated by Manufacturing
Technology Group.
C.Serial number D/L must be conformed when it is
produced in production line, because serial number D/L
is mandatory by D-book 4.0.
* Manual Download (Model Name and Serial Number)
If the TV set is downloaded by OTA or service man, sometimes
model name or serial number is initialized.(Not always)
There is impossible to download by bar code scan, so It
need Manual download.
a. Press the ‘Instart’ key of Adjustment remote control.
b. Go to the menu ‘5.Model Number D/L’ like below photo.
c. Input the Factory model name(ex 42LD450-ZA) or Serial
number like photo.
d. Check the model name Instart menu. -> Factory name
displayed. (ex 42LE7500-ZA)
e. Check the Diagnostics. (DTV country only) -> Buyer
model displayed. (ex 42LE7500-ZA)
Commercial MENU
SET PC

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4. Check Commercial Features
4.1. External SPK Out and Volume control
4.1.1. Equipment & Condition
- Jig(Speaker out JIG, Speaker out control Jig) or Oscilloscope
- Power only mode
4.1.2. Check the speaker out & control
1) Connect the External Speaker : Check the sound.
2) Press the “+” key on the control Jig : Check the Max output.
3) Press the “-” key on the control Jig : Check the Min output.
Connect oscilloscope, you can see this waveform.
4.2. IR Out and DC Power Outlet(5 V / 12 V)
4.2.1. Equipment & Condition
- Jig (commercial check JIG)
- Special 232C Cable for commercial check Jig
- Power only mode
4.2.2. Check the power out & IR out - commercial
check jig
1) Connect each other RS232C port on the Commercial Check
JIG.
2) Press RED Color key on Service remote control.
3) Check the LED of jig board.
- +12V / +5V LED (OK condition: Turn On)
- IR LED (OK condition: blinking)
4.2.3. Check the power out & IR out - mini jig
1) Connect mini jig on RS232c port.
2) Press RED Color key on Service remote control.
3) Check the LED of mini jig.
4.3. Pro:Idiom
1) Connect the RF Cable.
2) Turn to the Pro:Idiom channel (No. 333).
3) Check the video & sound.
** Only displayed at “POWER ONLY” mode
4.4. Front LED Clock
1) Check the LED Clock in Power only mode.
Button of Vol. control Waveform of Oscilloscope
UP(+)
DOWN(-)
Recommended Input Signal
: RF, 1 KHz, Sine wave

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) Adjustment remote coontrol
(2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern Generator
- Resolution :
480i, Comp1 (MSPG-925FA: Model-209, Pattern-65)
1080p Comp1 (MSPG-925FA: Model: 225, Pattern-65)’
1080p RGB (MSPG-925FA: Model-225, Pattern-65)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level: 0.7 ± 0.1 Vp-p
- Image
(3) Must use standard cable
5.1.3. Adjust method
(1) ADC 480i/1080p Comp1, RGB
1) Check connected condition of Comp1 cable to the
equipment.
2) Give a 480i, Horizontal 100% Color Bar Pattern to
Comp1.(MSPG-925FA -> 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 control after at
least 1 min of signal reception. Then, select ‘7. External
ADC’. And press OK or Right key for going to sub menu.
5) Press OK in Comp 480i menu.
6) Give a 1080p Mode, Horizontal 100% Color Bar Pattern
to Comp1. (MSPG-925A -> Model: 225, Pattern: 65)
7) Press OK in Comp 1080p menu.
8) Press OK in RGB menu.
9) If ADC Comp is successful, “ADC Component Success”
is displayed.
If ADC calibration is failure, “ADC Component Fail” is
displayed.
10) If ADC calibration is failure, after recheck ADC pattern
or condition, retry calibration
11) If ADC RGB is successful, “ADC RGB Success” is
displayed. If ADC calibration is failure, “ADC RGB Fail”
is displayed.
12) If ADC calibration is failure, after recheck ADC pattern
or condition, retry calibration Error message refer to 5).
5.2. EDID(The Extended Display Identification
Data)/DDC(Display Data Channel) download
(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”.
(2) Equipment
- Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need.
- Adjustment remote control
(3) Download method
1) Press ADJ key on the Adjustment remote control
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 download.
<Caution>
When EDID Download, must remove RGB/HDMI Cable.
(4) EDID DATA
AHDMI
ARGB
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D-sub to D-sub DVI-D to HDMI or HDMI to HDMI
For HDMI EDIDFor Analog EDID
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ
0x01 ⓒ01 03 80 10 09 78 0A EE 91 A3 54 4C 99 26
0x02 0F 50 54 A1 08 00 71 4F 81 80 01 01 01 01 01 01
0x03 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
0x04 45 00 A0 5A 00 00 00 1E 01 1D 00 72 51 D0 1E 20
0x05 6E 28 55 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A
0x06 3E 1E 53 10 00 0A 20 20 20 20 20 20 ⓓ
0x07 ⓓ01 ⓔ
0x00 02 03 26 F1 4E 10 1F 84 13 05 14 03 02 12 20 21
0x01 22 15 01 26 15 07 50 09 57 07 67 ⓕ
0x02 ⓕE3 05 03 01 01 1D 80 18 71 1C 16 20 58 2C
0x03 25 00 A0 5A 00 00 00 9E 01 1D 00 80 51 D0 1A 20
0x04 6E 88 55 00 A0 5A 00 00 00 1A 02 3A 80 18 71 38
0x05 2D 40 58 2C 45 00 A0 5A 00 00 00 1E 66 21 50 B0
0x06 51 00 1B 30 40 70 36 00 A0 5A 00 00 00 1E 00 00
0x07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ⓔ2
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x00 00 FF FF FF FF FF FF 00 1E 6D ⓐⓑ
0x01 ⓒ01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26
0x02 0F 50 54 A1 08 00 81 80 61 40 45 40 31 40 01 01
0x03 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C
0x04 45 00 A0 5A 00 00 00 1E 01 1D 00 72 51 D0 1E 20
0x05 6E 28 55 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A
0x06 3E 1E 53 10 00 0A 20 20 20 20 20 20 ⓓ
0x07 ⓓ00 ⓔ3

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* Address 10/11 and 7F means Manufacture Week and
Checksum. So this data will be change.
ADetail EDID Options are below (ⓐ, ⓑ, ⓒ, ⓓ, ⓔ,ⓕ)
ⓐProduct ID
ⓑSerial No. : Controlled on product line
ⓒMonth, Year: Controlled on production line:
ex) Monthly : ‘01’ -> ‘01’
Year : ‘2010’ -> ‘14’
ⓓModel Name(Hex):
ⓔChecksum: Changeable by total EDID data.
ⓕVendor Specific(HDMI)_FHD Model
5.3. White Balance Adjustment
5.3.1. Overview
(1) W/B adj. Objective & How-it-works
(2) Objective: To reduce each Panel’s W/B deviation
(3) 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.
(4) Adj. condition : normal temperature
1) Surrounding Temperature : 25 ºC ± 5 ºC
2) Warm-up time: About 5 Min
3) Surrounding Humidity : 20 % ~ 80 %
5.3.2. Equipment
1) Color Analyzer: CA-210 (CCFL/EEFL -> CH 9)
2) Adj. computer(During auto adj., RS-232C protocol is needed)
3) Adjustment remote control
4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
AColor Analyzer Matrix should be calibrated using CS-1000.
5.3.3. Equipment connection MAP
5.3.4. Adj. Command (Protocol)
ARS-232C Command used during auto-adj.
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. completed
*(wb 00 20(Start), wb 00 2f(completed)) -> Off-set adj.
wb 00 ff -> End white balance auto-adj.
AAdj. Map
5.3.5. Adj. method
(1) Auto adj. method
1) Set TV in adj. mode using POWER ON 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 adjustment.
5) When adj. is complete (OK Sign), check adj. status pre
mode. (Warm, Medium, Cool)
6) Remove probe and RS-232C cable to complete adj..
AW/B Adj. must begin as start command “wb 00 00” , and
finish as end command “wb 00 ff”, and Adj. offset if need.
Model Name HEX EDID Table DDC Function
FHD Model 0001 01 00 Analog
0001 01 00 Digital
MODEL MODEL NAME(HEX)
LG TV 00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20
INPUT MODEL NAME(HEX)
HDMI1 67 03 0C 00 10 00 B8 2D
HDMI2 67 03 0C 00 20 00 B8 2D
FHD ⓔ1ⓔ2ⓔ3
HDMI1 D7 11 X
HDMI2 D7 01 X
RGB X X 1D
Color Analyzer
Computer
Pattern Generator
RS-232C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed
RS-232C COMMAND Explanation
[CMD ID DATA]
wb 00 00 Begin White Balance adj.
wb 00 10 Gain adj.(internal white pattern)
wb 00 1f Gain adj. completed
wb 00 20 Offset adj.(internal white pattern)
wb 00 2f Offset adj. completed
wb 00 ff End White Balance adj.(Internal pattern disappears)
ITEM Command Data Range Default
(Hex.) (Decimal)
Cmd 1 Cmd 2 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

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(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 10 cm of the surface.
3) Press ADJ key -> EZ adjust using adjustment remote
control. -> White-Balance then press the cursor to the
right key(G). (When Key(G) is pressed 216 Gray 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.
AIf 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 216
Gray pattern.
AAdj. 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 10 cm 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.
5.3.6. Reference (White Balance Adj. coordinate
and temperature)
ALuminance : 216 Gray
AStandard color coordinate and temperature using CS-1000
(over 26 inch)
AStandard color coordinate and temperature using CA-
210(CH 9)
AEdge LED W/B Table in process of time(Only LGD module)
CA210 : CH 14, Test signal : Inner pattern(80 IRE)
5.4. HDCP(High-bandwidth Digital Contents
Protection) SETTING
- HDCP setting is not necessary in BCM model.
5.5. EYE-Q function check
Step 1) Turn on TV.
Step 2) Press EYE key of Adjustment remote control.
Step 3) Cover the Eye Q II sensor on the front of the using
your hand and wait for 6 seconds.
Step 4) Confirm that R/G/B value is lower than 10 of the “Raw
Data (Sensor data, Back light)”. If after 6 seconds,
R/G/B value is not lower than 10, replace Eye Q II
sensor.
Step 5) Remove your hand from the Eye Q II sensor and wait
for 6 seconds.
Step 6) Confirm that “ok” pop up. If change is not seen,
replace Eye Q II sensor.
5.6. Tool Option selection
- Method : Press ADJ key on the Adjustment remote control,
then select Tool option.
5.7. Ship-out mode check(In-stop)
After final inspection, press IN-STOP key of the Adjustment
remote control and check that the unit goes to Stand-by mode.
After final inspection, Always turn on the Mechanical S/W.
Mode Color Coordination Temp ∆UV
xy
COOL 0.269 0.273 13000 K 0.0000
MEDIUM 0.285 0.293 9300 K 0.0000
WARM 0.313 0.329 6500 K 0.0000
Mode Color Coordination Temp ∆UV
xy
COOL 0.269 ± 0.002 0.273 ± 0.002 13000 K 0.0000
MEDIUM 0.285 ± 0.002 0.293 ± 0.002 9300 K 0.0000
WARM 0.313 ± 0.002 0.329 ± 0.002 6500 K 0.0000
MODEL Tool 1 Tool 2 Tool 3 Tool 4 Tool 5
42LV375H 25953 12834 55332 22797 1059
GP2 Aging Time Cool Medium Warm
(Min.) 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 10-15 276 283 292 303 316 333
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 © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
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
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: 1.5 KV/min at 100 mA
- SIGNAL: 3 KV/min at 100 mA
• 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 0.5 mArms
7. Audio
Measurement condition:
1. RF input: Mono, 1 KHz sine wave signal, 100 % Modulation
2. CVBS, Component: 1 KHz sine wave signal 0.4 Vrms
3. RGB PC: 1 KHz sine wave signal 0.7 Vrms
8. USB S/W Download
(option, 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 Low,
it didn’t work. But your downloaded version is High, USB
data is automatically detecting
3) Show the message “Copying files from memory”
4) Updating is starting.
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 control.
2. Select “Tool Option 1” and push “OK” key.
3. Punch in the number. (Each model has their number.)
No. Item Min. Typ. Max. Unit
1. Audio practical max 9.0 10.0 12.0 W EQ Off
Output, L/R AVL Off
(Distortion=10% 8.5 8.9 9.8 Vrms Clear Voice Off
max Output)
2. Speaker 10.0 15.0 W EQ On
(8 Ω Impedance) AVL On
Clear Voice On

- 14 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING GUIDE
1. Power-Up Boot Fail Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20/24 V)
Check power connector and
RL_ON signal.
N
Check IC703 RESET pin. Check Switch SW700.
N
Y
Replace Power board.
N
Check X701 Clock 10 MHz.
Check X903 Clock 54 MHz.
Check X701/X903 application
circuit or Replace X701/X903.
N
Y
Check IC703 UART
communication 44, 45 pin.
Check UART line or replace
IC703.
N
Y
Check IR input state of IC703
13 pin. Check IR board.
N
Y
Re-download NEC MICOM.
Y
2. No OSD Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20 V)
Check power connector and
RL_ON signal.
N
Check Q1504 output Voltage
(12V).
Check Q1504 application circuit
or replace Q1504.
N
Y
Replace Power board.
N
Check LVDS FFC Cable. Replace Cable.
N
Y
Check LCD Module Control
board.
Y

- 15 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3. Analog RF Video Trouble Shooting guide
Check RF Cable.
(TU2701 RF Cable) You should replace Cable.
N
Check TU2701 Pin 11(Video
out put). Can you see the
normal signal?
Could you measure voltage of
TU2701 & IIC lines?
Are they all normal?
N
Y
You should check power line &
IIC line.
N
Check the input(PinAD9) of
BCM3556(IC100).
Measure waveform at
C110 or R2112 because it’s
more easy to check.
Can you see the normal
waveform?
Y
This board has big problem
because Main chip(BCM3556)
have some troubles.
After checking thoroughly all
path once again, You should
decide to replace BCM3556 or
not.
Y
You should replace TUNER.
Y
4. Digital RF Trouble Shooting guide
Check RF Cable.
MPI to TU2701 RF Cable You should replace Cable.
N
Check TU2701 power
Pin 16 (2.5 V), Pin 13(1.2 V) Check IC2701.
N
Y
Replace IC2701.
N
Check IIC signal TU2701
Pin 17, 18
Check IIC Line
SCL2_3.3 V/SDA3_3.3 V
N
Y
Check FE_TS_DATA[0]. Replace TU2701.
N
Y
Check Power of IC2802 (3.3 V /
1.8 V / 5 V). Check IC2800/ IC2803.
N
Y
Check IC2800/ IC2803.
N

- 16 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. AV1(SCART) Video Trouble Shooting guide
- CVBS input
- RGB input
Is Video input normal?
JK4100 Pin 20
Check the input source & AV
cable.
N
Check the LVDS cable. Connect the cable.
N
Y
Replace IC100.
Y
Is Video input normal?
JK4100 Pin 15, 11, 7.
Check the input source & AV
cable.
N
Check the LVDS cable. Connect the cable.
N
Y
Replace IC100.
Y
6. Component/RGB Video Trouble Shooting guide
- Component input
- RGB input
Is Video input normal?
JK900 Green/Blue/Red
Check the input source &
component cable.
N
Check the input of BCM3556
(IC100) C130, C131, C132
Check the register & Bead
L904/L903/L902 etc...
N
Y
Replace IC100.
Y
Is Video input normal?
JK905 Pin 1, 2, 3
Check the input source & RGB
cable.
N
Check EDID Data. Re-download EDID data or
Replace IC901.
N
Y
Check the input of BCM3556
C127, C128, C129
Check the register & Bead
L905/L906/L907 etc...
N
Y
Replace IC100.
Y

- 17 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. HDMI 1/ 2 Video Trouble Shooting guide
- HDMI 1
Is Video input normal?
JK800
Check the input source & HDMI
cable.
N
Check DDC communication line
JK800 Pin 16, 17 Check the EDID data.
N
Check 5V_HDMI, HPD line. Check the HDMI Cable.
N
Y
Replace IC100.
Y
Y
- HDMI 2
Is Video input normal?
JK802
Check the input source & HDMI
cable.
N
Check DDC communication line
JK802 Pin 16, 17 Check the EDID data.
N
Check Switch IC(IC800) output
signal. Replace IC800.
N
Check 5V_HDMI, HPD line. Check the HDMI Cable.
N
Y
Y
Check the IIC line IC800 to
IC100.
Y
Replace IC100.
Y
Y

- 18 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. Audio Trouble Shooting guide
All input is no sound. Check the input source &
input cable.
N
N
Only HDMI is no sound.
NOnly RF or DTV is no
sound.
N
Is the speaker normal? Check the speaker cable.
N
Is the speaker “on” on
Installation menu.
Y
Download the EDID
data.
Y
Check the Tuner in/out.
Y
Y
IC501 operate normal. Replace IC501.
N
Y
IC100 operate normal. Replace IC100.
N
Y
Replace main board.
Y
Set on speaker on menu.
9. External Speaker out Trouble Shooting guide
Check the input source. Check the input source.
N
N
IC502 operate normal. Check the mute Line or
Replace IC502.
N
Is the External speaker setting
“Fixed or Ext/Int variable” on
Installation menu?
Y
Y
IC500 operate normal. Replace IC500.
N
Y
IC100 operate normal. Replace IC100.
N
Y
Replace main board.
Y
Set volume control “Fixed
or Ex/Int variable”.

- 19 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
10. RS-232C(DSUB 9P) function Trouble Shooting guide
- Ext Power Out
Is the 5 V or 12 V out “Yes” on
Installation menu? Set “Yes” on Installation menu.
N
Check the IC1509(12 V),
IC1508(5 V). Replace IC1509, IC1508.
N
Y
Check the Q1506
(EXT_PWR_DET) line. Replace Q1506 part.
N
Y
Replace Main board.
Y
11. Commercial Function Trouble Shooting guide
- Front Clock
Check the Clock display setting
“Yes” on Installation menu. Set “Yes” on Installation menu.
N
Check the “Time” setting on
user menu. Set Time/Clock on user menu.
N
Y
Y
Is the clock cable normal?
Y
- IR Out
Check the IR Waveform of
Q2401, Q2402. Replace Q2401, Q2402.
N
Replace IC702.
N
Check the clock cable.
N
Check the +5 V_ST Line. Replace the IC706.
N
Y
Check the IC705.
Y
Check the LED Clock Ass’y.
Replace the IC705
N
Check the JK1100 4 Pin
connection.
Check the IC702.
Y
Y

- 20 - LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
BLOCK DIAGRAM
BCM3556
(EU Comme rcial)
Analog
CI
FE_TS_Parallel CI
AMP
Speaker
NVRAM
PKT0
PKT1
RMX0
EXT
Speaker
Digital
Tun er
DVB-T/C
NIM
DDR2
1Gb x 4
NAND
Flash 4Gb
RGB
SCART
COMP
COMP L/R
SPIDIF
Headphone
LPF
D Class Amp HDMI2
HDMI1
TVLink
MAX3232
NEC SUB
MICOM
UART
Pro:Idiom
TP_INPUT
Decrypted TP
HDMI
SWITCH
HDMI2
EXT Vol Ctrl
Modu le
LVDS(51pin)
USB
CLOCK
Display
Commercial Feature Block
Ethernet
Ethernet
SWITCH