LG 22LN4060 User manual

Printed in KoreaP/NO : MFL67698506 (1307-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 : LM91P
MODEL : 22LN4060 22LN4060-TB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SERVICING PRECAUTIONS .................................................................... 4
SPECIFICATION ....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 7
TROUBLE SHOOTING GUIDE ............................................................... 10
BLOCK DIAGRAM .................................................................................. 18
EXPLODED VIEW .................................................................................. 19
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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Only for training and service purposes
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 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

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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.

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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.

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Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to the LM91P 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(1EA)
6. USB Input MP3, JPEG,Movie Rear(1EA)
7. AV Audio Output RF/AV Rear(1EA)
8. Audio Input (1EA) AV L/R Input(2EA)
9. Service jack 3.5mm headphone jack Rear(1EA)

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Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LED TV with
LM91P 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. White Balance Adjustment
3.1. Overview
3.1.1. 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
3.1.2. 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.
3.2. 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 Remote control
(4) Video Signal Generator MSPG-925F 720p/204-Gray
(Model: 217, Pattern: 49)
* Color Analyzer Matrix should be calibrated using CS-1000.
3.3. Equipment connection
3.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
(2) Adjustment Map
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

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Only for training and service purposes
3.5. Adjustment method
3.5.1. 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.
3.5.2. 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
3.6. 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.
4. 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.
5. 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.
6. AUDIO output check
6.1. Audio input condition
(1) RF input: Mono, 1KHz sine wave signal, 100% Modulation
(2) CVBS, Component: 1KHz sine wave signal (0.4Vrms)
6.2. Specification
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: 1.5 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
(80IRE, 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 (8 Ω Impedance)

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Only for training and service purposes
8. 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.)
9. Optional adjustments
9.1. Manual White balance Adjustment
9.1.1. 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.
9.1.2. 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 Remot control
(4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model: 217, Pattern: 78)
9.1.3. 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 10 cm 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.

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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,IC711.
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

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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 wafer
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 R720,
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

- 12 - 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)

- 13 - 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

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. Abnormal screen (AV)-Main PCBA
Put into AV cable completely?
Abnormal screen (AV)
YES
NO
NO
Insult AV cable tight
1
Change IC501
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing to 480I, 576I
Or change format CVBS
2
Is waveform at R505
3Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
YES
R505 (CVBS)
3

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. 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)

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. 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

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. Abnormal sound (AV)-Main PCBA
Put into AV cable completely?
Abnormal sound (AV)
YES
NO Insult AV cable tight
1
Change IC501
WAVEFORMS
Is waveform at C520,C521
2Check Line between JK101 and IC501
is open or short, Another is
change AV cable
NO
YES
C520,C521(audio in)
2

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Adaptor
Sound AMP
NTP7513
(
(
(
(
Module
Audio
Out
MST6841XP
5
9
4
3
10 11
Tuner SDA Tuner SCL
TUNER
IF_AGC
B+
IR/KEY
40
24Mhz
98 99 44 43
IC502
Serial Flash
8Mbytes
IC503
EEPROM
24C64
30
LPF 33
18
21
OP-AMP
x4 Gain
Audio L-Out
XXX
39
37 38
Audio R-Out
HDMI
SCL/SDA
48
115
50 51 113 112
Audio_SCL
Audio_SDA
LVDS
Output
P Dim
Inv. ON
P_ST 3.5V
M_3.3V
TU_3.3V
12~19V
Main_1.2V
+18V
10 11
7 8 9
38
I2S_MCLK
I2S_WS
I2S_SCK I2S_SDO
108
111
117
IR
KEY1
Led_PWR
102 105
53
52
45
85 84
EEP SDA
EEP SCL
94
95
97
96
SPI_CLK SPI_DI SPI_CZ SPI_DO
S_AMP_19V
32
40
LPF
USB_5V
110
KEY2
ST_3.5V
P_12V
Q710
Main_1.8V
M_3.3V
Q720
AO3407A
Panel_Vcc
Main_5V
To USB
USB_DN
USB_DP
IF_P
IF_N
31
35
1.8V REG
7
TU_1.8V
19
20
Audio out
27,35,3622,20,24,
77 62 54
41 30 18
9116 107
100
101
Led_PWR
DT1641S
TPS40210
Module
BLU
22”/26”
LED_28V
BLU_24V
Module
BLU
24”
MP20051
1.8V REG
MP1472
MP1584
MP1472
+18V
Q712 To
OP_AMP
CVBS In
AV audio in
BLOCK DIAGRAM

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
A2 A31
900
200
400
540
910
120
122
300
510
502
511
501
800
801
LV1
EXPLODED VIEW
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 X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
INPUT1
JP111
PANEL_VCC
C110
0.1uF
16V
P101
10031HR-30
21.6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
JP129
JP122
JP130
C123
100pF50V
READY
R120
3.3K JP120
IR
KEY2
KEY1
JP121
R123
100
C122
100pF50V
READY
JP123
R130
100
Q121
MMBT3904(NXP)
E
B
C
P120
12507WR-12L
1
2
3
4
5
6
7
8
9
10
11
12
13
Q120
MMBT3904(NXP)
E
B
C
C120
0.1uF
16V
EEP_SCL
JP127
R121
3.3K
JP131
C121
0.1uF
16V
JP125
LED_AMBER
JP124
JP128
LED_B
R122
100
JP126
EEP_SDA
L120
BLM18PG121SN1D
+3.3V_M
JP112
P102
10031HR-30
18.5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
C112
10uF
16V
READY
+3.5V_ST
+3.5V_ST
+3.5V_ST
+3.5V_ST
R110
10K
READY
R111
10K
R126
10K
R127
10K
READY
R129
10K
R128
10K
READY
C124
1000pF
50V
RXA3+
RXA2+
RXA1-
RXA3-
RXA0+
RXA2-
RXA1+
RXACK+
RXACK-
RXA0-
RXA1-
RXA3-
RXA2-
RXA0-
RXA3+
RXA0+
RXACK-
RXA1+
RXA2+
RXACK+
VLCD
VLCD
L110
UBW2012-121F
R108
1K
MUTE_AOUT
R101
75
R102
220K
JP103
JP104 MNT_LOUT
R104
12K
AUDIO_LIN
Q103
MMBT3904(NXP)
EB
C
JK101
PPJ234-03
5A [RD1]O-SPRING
6A [RD1]E-LUG
4A [RD1]CONTACT
7B [WH1]E-LUG-S
5B [WH1]O-SPRING
7C [RD2]E-LUG-S
5C [RD2]O-SPRING
4C [RD2]CONTACT
5D [WH2]O-SPRING
4E [YL]CONTACT
5E [YL]O-SPRING
6E [YL]E-LUG
R105
220K
R106
10K
AUDIO_RIN
JP105
MUTE_AOUT
C104
10uF
16V
JP102 R103
10K
R107
12K
JP101
C106
10uF
16V
Q101
MMBT3904(NXP)
EB
C
CVBS_VIN
R112
3.9K
MNT_ROUT
C105
5600pF
50V
R109
1K
C103
5600pF
50V
R113
3.9K
R124
100
R125
100
D123
20V
D127
20V
D126
20V
D125
READY
20V
D122
READY
20V
D120
20V
D121
20V
D103
20V
D102
20V
D104
20V
D105
20V
ZD101
5.6B
ZD102
5.6B
C126
4.7uF
10V
C125
4.7uF
10V
D124
5.6V
C102
1000pF
50V
C101
1000pF
50V
1 8
INPUT1/LVDS
CONTROL Key
IR & LED
LVDS
POP NOISE
AV_IN/OUT
POP NOISE
EAX65303201
LN4050 2012/12/18
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only