LG 22LN4050 User manual

Printed in KoreaP/NO : MFL67732805 (1304-REV00)
LED 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
CHASSIS : LB35A
MODEL : 22LN4050 22LN4050-TB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

- 2 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SERVICING PRECAUTIONS .................................................................... 4
SPECIFICATION ....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING GUIDE ............................................................... 13
BLOCK DIAGRAM .................................................................................. 23
EXPLODED VIEW .................................................................................. 24
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 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
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

- 4 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conict between the
following servicing precautions and any of the safety precautions
on page 3 of this publication, always follow the safety precau-
tions. Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug
or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explo-
sion hazard.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specied otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10 % (by volume) Acetone and 90 %
(by volume) isopropyl alcohol (90 % - 99 % strength)
CAUTION: This is a ammable mixture.
Unless specied otherwise in this service manual, lubrication
of contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks
are correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test xtures specied in this
service manual.
CAUTION: Do not connect the test xture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged eas-
ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some eld-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam-
age caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground. Alter-
natively, obtain and wear a commercially available discharg-
ing wrist strap device, which should be removed to prevent
potential shock reasons prior to applying power to the unit
under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or expo-
sure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static type solder removal device. Some sol-
der removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufcient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads elec-
trically shorted together by conductive foam, aluminum foil or
comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective mate-
rial to the chassis or circuit assembly into which the device will
be installed.
CAUTION: Be sure no power is applied to the chassis or cir-
cuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replace-
ment ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted oor can generate static electricity suf-
cient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropri-
ate tip size and shape that will maintain tip temperature within
the range or 500 °F to 600 °F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 °F to 600 °F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder ows onto and around both the compo-
nent lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.

- 5 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent at against the cir-
cuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing
the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close
as possible to the component body.
2. Bend into a "U" shape the end of each of three leads remain-
ing on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as pos-
sible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and
if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed when-
ever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC connec-
tions).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly con-
nected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the
lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

- 6 - 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 specification is applied to the LB35A chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
(1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
(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. Model General Specification
* HDMI 1.4 with Deep Color is only apply for FHD Model
No. Item Specication Remarks
1. Market NON EU
2. Broadcasting system
PAL/SECAM B/G/D/K
PAL-I
NTSC-M
3. Channel Storage
BAND PAL(BG,I) NTSC(M) China(DK)
VHF/UHF 01-C69 2~78 C1~C69
Cable S1~S47 1~71 S1~S47
4. Receiving system Upper Heterodyne
5. Video Input PAL, SECAM, NTSC Rear (2EA)
6. Component Input Y/Cb/Cr, Y/Pb/Pr Rear (1EA)
7. USB Input MP3, JPEG,Movie Side(1EA)
8. AV Audio Output RF/AV/HDMI Audio Output Rear (1EA)
9. D-SUB INPUT S/W Upgrade Only Rear (1EA)
10. HDMI Input HDMI-DTV, Only PCM MODE Rear (2EA)
11. Audio Input (1EA) AV&Component L/R Input(2EA)

- 7 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. Component Video Input (Y, PB, PR)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed
1. 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
2. 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
3. 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
4. 720*480 31.47 59.94 27.000 SDTV 480P
5. 720*480 31.50 60.00 27.027 SDTV 480P
6. 720*576 31.25 50.00 27.000 SDTV 576P 50Hz
7. 1280*720 44.96 59.94 74.176 HDTV 720P
8. 1280*720 45.00 60.00 74.250 HDTV 720P
9. 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
10. 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz,
11. 1920*1080 33.72 59.94 74.176 HDTV 1080I
12. 1920*1080 33.75 60.00 74.25 HDTV 1080I
13. 1920*1080 56.25 50 148.5 HDTV 1080P
14. 1920*1080 67.432 59.94 148.350 HDTV 1080P
15. 1920*1080 67.5 60.00 148.5 HDTV 1080P
6. HDMI Input
6.1. PC Mode
* Spec. out but it can be shown the picture at only HDMI/DVI IN 1 via DVI to HDMI Cable
* Monitor Range Limits
Min Vertical Freq - 58 Hz / Max Vertical Freq - 63 Hz
Min Horiz. Freq - 28 kHz / Max Horiz. Freq - 68 kHz
Pixel Clock - 150 MHz
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remarks
1. 640×480 31.469 59.94 25.17 VESA(VGA)
2. 800×600 37.879 60.317 40.00 VESA(SVGA)
3. 1024×768 48.363 60.004 65.00 VESA(XGA)
4. 1280×768 47.776 59.87 79.5 VESA(WXGA)
5. 1360×768 47.72 59.799 84.62 VESA(WXGA)
6 1366×768 47.7 60.00 84.62 WXGA
7. 1280×1024 63.595 60.00 108.875 SXGA
8. 1920×1080 66.647 59.988 138.625 WUXGA

- 8 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
No. Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1. 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I)
Spec. out but display.2. 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I)
3. 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz
4. 720*480 31.47 59.94 27 SDTV 480P
5. 720*480 31.5 60.00 27.027 SDTV 480P
6. 720*576 31.25 50.00 27 SDTV 576P
7. 1280*720 44.96 59.94 74.176 HDTV 720P
8. 1280*720 45 60.00 74.25 HDTV 720P
9. 1280*720 37.5 50.00 74.25 HDTV 720P
10. 1920*1080 28.125 50.00 74.25 HDTV 1080I
11 1920*1080 33.72 59.94 74.176 HDTV 1080I
12 1920*1080 33.75 60.00 74.25 HDTV 1080I
13 1920*1080 56.25 50.00 148.5 HDTV 1080P
14 1920*1080 67.432 59.94 148.350 HDTV 1080P
15 1920*1080 67.5 60.00 148.5 HDTV 1080P
16 1920*1080 27 24.00 74.25 HDTV 1080P
17 1920*1080 33.75 30.00 74.25 HDTV 1080P
18 1920*1080 26.97 23.97 74.25 HDTV 1080P
19 1920*1080 33.716 29.976 74.25 HDTV 1080P
6.2. DTV Mode

- 9 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LED TV with
LB35A 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 °C ± 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 100-220 V,
50/60Hz.
(5) The receiver must be operated for over 5 minutes prior to
the adjustment when module is in the circumstance of
above 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 a still image is displayed for 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. MAIN PCBA Adjustments
3.1. ADC Calibration
3.1.1. Using D/L Jig
- An ADC calibration is automatically adjusted from DFT-Jig
- If it needs to adjust manually, refer to appendix.
* ADC Calibration Protocol (RS232)
Adjust Sequence
▪ aa 00 00 [Enter Adjust Mode]
▪ xb 00 40 [Component1 Input (480i)]
▪ ad 00 10 [Adjust 480i Comp1]
▪ aa 00 90 End Adjust mode
3.2. EDID Download
▪ HD MODEL
▪ 8BIT FHD MODEL
a. White Balance Adjustment
NO Item CMD 1 CMD 2 Data 0
Enter Adjust
MODE
Adjust
‘Mode In’ A A 0 0 When transfer the ‘Mode In’, Carry the command.
ADC adjust ADC
Adjust A D 1 0 Automatically adjustment (The use of a internal pattern)
** HDMI 1 : 256Bytes
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 17 01 03 80 A0 5A 78 0A F3 30 A4 54 46 96 26
20 0F 49 4B 21 08 00 45 40 01 01 61 40 01 01 01 01
30 01 01 01 01 01 01 01 1D 00 72 51 D0 1E 20 6E 28
40 55 00 C4 8E 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 77 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 84 07 01 16 02 03 11 12 13 14 05
90 20 22 1F 10 26 11 07 50 09 7F 07 83 01 00 00 68
A0 03 0C 00 10 00 80 1E 00 01 1D 00 80 51 D0 1C 20
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
** HDMI 1 : 256Bytes
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 17 01 03 80 A0 5A 78 0A D9 B0 A3 57 49 9C 25
20 11 49 4B 21 08 00 01 01 45 40 61 40 01 01 81 80
30 01 01 D1 C0 01 01 02 3A 80 18 71 38 2D 40 58 2C
40 45 00 08 44 21 00 00 1E 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 BC 88 21 00 00 1C 00 00 00 FC 00 4C
60 47 20 54 56 0A 20 20 20 20 20 20 20 00 00 00 FD
70 00 3A 3F 1C 44 0F 00 0A 20 20 20 20 20 20 01 ⓐ
80 02 03 28 F1 4F 90 07 01 16 02 03 11 12 13 04 14
90 05 20 22 1F 26 11 07 50 09 7F 07 83 01 00 00 68
A0 03 0C 00 10 00 80 1E 00 01 1D 00 80 51 D0 1C 20
B0 40 80 35 00 BC 88 21 00 00 1E 8C 0A D0 8A 20 E0
C0 2D 10 10 3E 96 00 13 8E 21 00 00 18 8C 0A A0 14
D0 51 F0 16 00 26 7C 43 00 C4 8E 21 00 00 98 01 1D
E0 80 18 71 1C 16 20 58 2C 25 00 C4 8E 21 00 00 9E
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓐ
EDID C/S data HD FHD (8Bit)
HDMI HDMI
Check sum
(Hex)
Block 0 A5 C1
Block 1 44(HDMI1) 44 (HDMI1)
34(HDMI2) 34 (HDMI2)

- 10 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. White Balance Adjustment
4.1. Overview
4.1.1. 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
1) Surrounding Temperature: 25 °C ± 5 °C
2) Warm-up time: About 5 Min◦
3) Surrounding Humidity: 20% ~ 80%
4) Before White balance adjustment, Keep power on
status, don’t power off
4.1.2. 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 10 cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
1) After Aging Start, Keep the Power ON status during 5
Minutes.
2) In case of LCD, Back-light on should be checked using
no signal or Full-white pattern.
4.2. 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)
* Color Analyzer Matrix should be calibrated using CS-1000.
4.3. Equipment connection
4.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
(2) Adjustment Map
4.5. Adjustment method
4.5.1. 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.
4.5.2. LED White balance table
- If Model is Polaris Model, G-gain fix is applied.
(1) Cool Mode
1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
2) Principle : To adjust the white balance without the
saturation, Fix the G gain to 172 (default data) and
change the others (R/B Gain ).
3) Adjustment mode : mode - Cool
(2) Medium / Warm Mode
1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
2) Principle : To adjust the white balance without the
saturation, Fix the one of R/G/B gain to 192 (default
data) and decrease the others.
3) Adjustment mode : Two modes - Medium / Warm
Co lo r An alyzer
Co mp ut er
Pat tern Generat or
RS -2 32C
RS-2 32C
RS-2 32C
Probe
Signal Source
* If TV internal pattern is used, not needed
RS-232C COMMAND Explantion
CMD DATA ID
wb 00 00 Begin White Balance adjustment
wb 00 ff End White Balance adjustment
(internal pattern disappears )
Adj. item Command
(lower caseASCII)
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

- 11 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.6. Reference(White Balance Adjustment
coordinate and color temperature)
(1) Luminance: 204 Gray, 80IRE
(2) Standard color coordinate and temperature using CS-1000
(over 26 inch)
■ The spec of color temperature and coordinate.
* Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature.
5. Tool Option setting & Inspection per
countries
(1) Press 'IN START' key at Factory Service remote control.
(2) Select 'Tool Option 1'.
(3) Punch in the number and press 'OK'. (Each of models has
their number)
(4) Correct 'Tool Option2' ~ 'Tool Option5'.
(5) Completed adjusting Tool option.
6. Ship-out mode check (In-stop)
▪ After final inspection, press In-Stop key of the Adjustemnt
Remote Control and check that the unit goes to Stand-by mode.
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
8. GND and HI-POT Test
8.1. GND & HI-POT auto-check preparation
(1) Check the POWER CABLE and SIGNAL CABE insertion
condition
8.2. 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.
8.3. Checkpoint
(1) Test voltage
- GND: 1.5 KV / min at 100 mA
- SIGNAL: 3 KV / min at 100 mA
(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 0.5 mArms
Mode Color Temp Color coordinate Remark
Cool
(C50) 13,000 K x = 0.269 (±0.002) y = 0.273 (±0.002) * Test signal
- Inner pattern for
W/B adjust
- External white
pattern
(85IRE, 204gray)
Medium
(0) 9,300 K x = 0.285 (±0.002) y = 0.293 (±0.002)
Warm
(W50) 6,500 K x = 0.313 (±0.002) y = 0.329 (±0.002)
Item Min Typ Max Unit Remark
Audio practical
max Output, L/R
(Distortion=10%
max Output)
4.5 5.0 6.0 W
Vrms
(1) Measurement condition
- EQ/AVL/Clear Voice: Off
(2) Speaker (8Ω Impedance)

- 12 - 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”.
(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.)
10. Optional adjustments
10.1. Manual ADC Calibration
■ Enter ‘EZ ADJUST’ mode by pressing ‘ADJ’ key.
■ Enter Internal ADC calibration mode by pressing ‘’ or ‘OK’
key at ‘7. ADC Calibration’
► Caution : Using ‘P-ONLY’ key of the Factory Service
remote control when turns TV on.
10.2. Manual White balance Adjustment
10.2.1. Adjustment 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
1) After Aging Start, Keep the Power ON status during 5
Minutes.
2) In case of LCD, Back-light on should be checked using
no signal or Full-white pattern.
10.2.2. 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 Remot control
(4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model: 217, Pattern: 78)
10.2.3. Adjustment
(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 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.
■ 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 216 Gray pattern.
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option Commercial
6. Country Group
7. Area Option
8. ADC Calibration ►
9. White Balance
10. 10 Point WB
11. Test Pattern
12. EDID D/L
13. Sub B/C
14. Ext. Input Adjust
ADC Calibration
ADC Comp 480i
ADC Comp 1080p
ADC RGB
Start
NG
NG
NG
Reset

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. NO POWER-Main PCBA
Is Adapter
Output VOLTAGE 19.4V
through of JK700?
NO POWER
Is 3.3V at C708?
Check waveform of X501
YES
NO
YES
NO
YES
check open or short at Line.
or change Adapter.
check the Lines of IC701,
If there is any problem at Line,
Change IC701
NO
Check Line short or open between
IC501 and X501,
Change IC501 or change X501
1
2
4
Is 1.8V at C745?
is 1.25V at C742?
3
YES
check the Lines of IC711,IC704
If there is any problem at Line,
Change IC704,IC706.
NO
Insert F/W
is 3.3V at 1pin of P120?
when push power key,
Is 0v at 2pin of P120?
Change control
Or check Line short or open of P120
5
is there any waver at 11pin of P120,
when use remote controller?
6
NO
YES
change IR board
Or check Line short or open of P120
NO
4
X501

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2. No raster (Power LED blue, black screen)
Is 19.4V at JK700?
NO RASTER
(Screen is not displayed)
Insert the F/W back
or REPLACE LCD MODULE
Is 1.8V at L501?
Is 1.25V at L500?
Is 1.25V at 4pin of IC704?
Is 1.8V at 2pin of IC711?
YES
NO
YES
NO
YES
Check Line short or open between
IC711/IC704 and IC501,
If there is any problem at Line,
Change IC711/IC704 or change IC501
NO check open or short at Line and waf er
between IC704,IC711 and IC600.
If there is any problem at Line,
Change IC704,IC711 or IC501
1
2
is 3V at 3pin of IC801?
YES
It is not over 3V at 1pin of IC801.
Change Q802.
Or check Line short or open between
R803 and 95pin of IC501.
Change IC 501.
4
3
NO
check open or short at Line.
or change Adapter
is 12V at 1pin of P101?
If is not under 1.5V at R722,
change Q721 or check open and short
of Line among Q720 and Q721.
If is under 11V at L110,
Check open and short
Of line between L110 and P101.
6NO
Put into LVDS cable completely?
LVDS cable have damage?
NO
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
5
YES
YES

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3. Abnormal/No screen (All input)-Main PCBA
Put into LVDS cable completely?
LVDS cable have damage?
Abnormal/No screen
(all input)
Check waveform at signal
line of P101 (Clock:9,10
Data: 6,7,12,13,15,16,18,19)
YES
NO
YES
NO
YES
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
1
Change module
WAVEFORMS
3
Is 12V at 1pin of P101?
If is not under 1.5V at R722,
change Q721 or check open and short
of Line among Q720 and Q721.
If is under 11V at L110,
Check open and short
Of line between L110 and P101.
2
3NO Check open and short
Of line between Q720 and P101.
Or Check LVDS cable have damage.
Another is change IC501.
6,7,12,13,15,16,18,19 Pin of 1201
(Data Line)
9,10Pin of P101
(Clock line)

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Put into RF cable completely?
Abnormal screen (TV)
YES
NO
NO
insult RF cable tight and then
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
Is 1.8V at 7pin of TU401?
2
Is I2C waveform
At 3,4pin of TU401?
3
4Is IF waveform at 43
,44 pin of IC501?
NO
NO
3
3Pin of TU401 (SCL) 4Pin of TU401 (SDA)
4
43,44pin of IC501
If 1.7V is not at plus pin of TU401, check
It is over 3V at 2pin of IC401,
if it is not, Check Line between TU401
and IC401 is open or short.
Another is change IC401 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
4. Abnormal screen (TV)-Main PCBA

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. Abnormal screen (AV)-Main PCBA
wGGh}GGf
Abnormal screen (AV)
YES
NO
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
p GpG  GG
GG Gf
Change Timing to 480I, 576I
Or change format CVBS
2
p GG Gy\W\
3Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
YES
y\W\GOj}izP
3

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. Abnormal screen (HDMI)-Main PCBA
Put into HDMI
cable completely?
Abnormal screen (HDMI)
YES
NO
NO
insulted HDMI cable
1
Change IC501
Is Input signal timing
and format in spec?
Change Timing according to
product spec, change format
under 8 bit in Ycbcr, Ypbpr, RGB
2
Is waveform at 10,12pin
of JK204?
3
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
YES
YES
Is waveform at 1,3,4,6,7,9pin
Of JK204?
YES
4
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
NO
Can read EDID and
HDCP key though
16,15pin of JK204
Check Line between JK204 and IC501
is open or short, Another is
Change HDMI cable
YES
Is 5V at 19pin of JK204?
Check Line between JK204 and IC501
is open or short, Another is
Change IC501 or HDMI cable
5
YES
6

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. No sound (all source )-Main PCBA
Does wire connect P301 with speaker?
NO sound (All source)
YES
NO
YES
NO
YES
Connect wire between P301 and speaker.
1
Change speaker and wire
Is 19.4V at 19,20,31,32pin
of IC301 ?
If 8V is not plus at L703, check
of JK700 is open.
If is not Check Line between L703
and IC301 is open or short.
.Another is change IC301
2
NO
Is 3.3V at 40pin of IC301?
If 3V is not plus 30pin of IC301,
check It is over 3V at L301
if it is not, Check Line between L301
and IC301 is open or short.
Another is change IC701,IC301
NO
3
4
YES
Is I2C waveform at
10,11pin of IC301?
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
NO
5
Is I2S waveform at
R301,R302,R303,R304?
6
Check Line between IC301 and IC501
is open or short, Another is change
IC301 or IC501.
YES
Is there any waveform P301?
Check Line between IC301 and P301
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC301
NO
4
10pin of IC301 11pin of IC301
5
R301(SDO) R302(WS) R303(SCK)
5
R304(MCLK)
6
1pin of P301(Audio out)

- 20 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. Abnormal sound (TV)-Main PCBA
Put into RF cable completely?
Abnormal sound (TV)
YES
NO insult RF cable tight and then
Cable nut screw tight.
1
2
3
4
NO
Change Main PCBA
WAVEFORMS
Is 1.8V at 7pin of TU401?
Is I2C waveform
At 3,4pin of TU401?
Is IF waveform at 43
,44 pin of IC501?
NO
NO
3
3Pin of TU401 (SCL) 4Pin of TU401 (SDA)
4
43,44pin of IC501
If 1.7V is not at plus pin of TU401, check
It is over 3V at 2pin of IC401,
if it is not, Check Line between TU401
and IC401 is open or short.
Another is change IC401 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401
Check Line between TU401 and IC501
is open or short, Another is change
IC501 or TU401