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 1W), keep the resistor 10mm 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 1MΩ and 5.2MΩ.
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 1.5K/10watt resistor in parallel with a 0.15uF 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
0.5mA.
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
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 conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
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
explosion 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 specified 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 flammable mixture.
Unless specified 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 fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage 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.
Alternatively, obtain and wear a commercially available
discharging 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
exposure 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 solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient 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
electrically 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 material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
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 wirebristle (0.5 inch, or 1.25cm) 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 flows onto and around both the
component 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
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit 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).
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 remaining
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
possible 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 whenever
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
connections).
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
connected 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.
7) Push The “IN STOP KEY” - For memory initialization.
3. Main PCB check process
* APC - After Manual-Insult, executing APC
* Boot file Download
1) Execute ISP program “Mstar ISP Utility” and then click
“Config” tab.
2) Set as below, and then click “Auto Detect” and check “OK”
message
If “Error” is displayed, Check connection between
computer, jig, and set.
3) Click “Read” tab, and then load download file (XXXX.bin)
by clicking “Read”
4) Click “Connect” tab. If “Can’t” is displayed, check
connection between computer, jig, and set.
5) Click “Auto” tab and set as below
6) Click “Run”.
7) After downloading, check “OK” message.
* USB DOWNLOAD
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”
filexxx.bin
(4)
(7) .OK
(5)
(6)
(1)
fil exxx.bi n
(2)
(3)
Please Check the Speed :
To use speed between
from 200KHz to 400KHz
Case1 : Software version up
1. After downloading S/W by USB, TV set will reboot
automatically
2. Push “In-stop” key
3. Push “Power on” key
4. Function inspection
5. After function inspection, Push “I n-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push
“In-stop” key at first.
2. Push “Power on” key for turning it on.
-> If you push “Power on” key, TV set will recover
channel information by itself.
3. After function inspection, Push “In-stop” key.
Page 10
4) Updating is staring.
5) Fishing the version uploading, you have to put USB stick
and “AC Power” off.
6) After putting “AC Power” on and check updated version on
your TV.
* 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 controller
2) Select “Tool Option 1” and Push “OK” button.
3) Punch in the number. (Each model hax their number)
4) Completed selecting Tool option.
3.1. ADC Process
(1) ADC
• Input signal : Component 480i
• Signal equipment displays.
- Component 480I
MODEL: 209 in Pattern Generator(480i Mode)
PATTERN : 65 in Pattern Generator(MSPG-925 SERIES)
• After enter Service Mode by pushing “ADJ” key,
• Enter Internal ADC mode by pushing “
G
” key at “5. ADC
Calibration”
<Caution> Using ‘power on’ button of the Adjustment R/C ,
power on TV.
* ADC Calibration Protocol (RS232)
Adjust Sequence
• aa 00 00 [Enter Adjust Mode]
• xb 00 40 [Component1 Input (480i)]
• ad 00 10 [Adjust 480i Comp1]
• xb 00 60 [RGB Input (1024*768)]
• ad 00 10 [Adjust 1024*768 RGB]
• aa 00 90 End Adjust mode
* Required equipment : Adjustment R/C.
3.2. Function Check
(1) Check display and sound
- Check Input and Signal items. (cf. work instructions)
1) TV
2) AV (SCART1/SCART2/ CVBS)
3) COMPONENT (480i)
4) RGB (PC : 1024 x 768 @ 60hz)
5) HDMI
6) PC Audio In
* Display and sound check is executed by remote control.
· W/B Equipment condition
CA210 : CH 9, Test signal : Inner pattern (85IRE)
· Above 5 minutes H/run in the inner pattern. (“power on” key
of adjust remote control)
* Connecting picture of the measuring instrument
(On Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment R/C POWER ON ->
Enter the mode of White-Balance, the pattern will come out.
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2) Adhere closely the Color Analyzer (CA210) to the module
less than 10cm distance, keep it with the surface of the
Module and Color Analyzer’s Prove vertically.(80~100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5minutes.
- Using ‘no signal’ or ‘full white pattern’ or the others,
check the back light on.
• Auto adjustment Map(RS-232C)
RS-232C COMMAND
[CMD ID DATA]
Wb 0000White Balance Start
Wb 00ffWhite Balance End
** Caution **
Color Temperature : COOL, Medium, Warm.
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.
(when R/G/B Gain are all C0, it is the FULL Dynamic Range
of Module)
* Manual W/B process using adjusts Remote control.
• After enter Service Mode by pushing “ADJ” key,
• Enter White Balance by pushing “
G
” key at “6. White
Balance”.
* After done all adjustments, Press “In-start” button and
compare Tool option and Area option value with its BOM, if
it is correctly same then unplug the AC cable. If it is not
same, then correct it same with BOM and unplug AC cable.
For correct it to the model’s module from factory JIG model.
* Push The “IN STOP KEY” after completing the function
inspection.
4.2. DDC EDID Write (RGB 128Byte )
• Connect D-sub Signal Cable to D-sub Jack.
• Write EDID Data to EEPROM(24C02) by using DDC2B
protocol.
• Check whether written EDID data is correct or not.
* For SVC main Ass’y, EDID have to be downloaded to Insert
Process in advance.
4.3. DDC EDID Write (HDMI 256Byte)
• Connect HDMI Signal Cable to HDMI Jack.
• Write EDID Data to EEPROM(24C02) by using DDC2B
protocol.
• Check whether written EDID data is correct or not.
* For SVC main Ass’y, EDID have to be downloaded to Insert
Process in advance.
4.4. EDID DATA
1) All Data : HEXA Value
2) Changeable Data :
*: Serial No : Controlled / Data:01
**: Month : Controlled / Data:00
***:Year : Controlled
****:Check sum
- When pressing IN-STOP key by SVC remocon, Red LED are
blinked alternatively. And then Automatically turn off.
(Must not AC power OFF during blinking)
4.6. Internal pressure
Confirm whether is normal or not when between power
board’s ac block and GND is impacted on 1.5kV(dc) or
2.2kV(dc) for one second
5. Model name & Serial number D/L
• press “Power on” key of service remocon.
(Baud rate : 115200 bps)
• Connect RS232 Signal Cable to RS-232 Jack.
• Write Serial number by use RS-232.
• Must check the serial number at the Diagnostics of SET UP
menu. (Refer to below).
5.1. Signal TABLE
CMD : A0h
LENGTH : 85~94h (1~16 bytes)
ADH : EEPROM Sub Address high (00~1F)
ADL : EEPROM Sub Address low (00~FF)
Data : Write data
CS : CMD + LENGTH + ADH + ADL + Data_1 +…+ Data_n
Delay : 20ms
5.2. Command Set
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0,
Phase
Data write : Model Name and Serial Number write in
EEPROM,.
5.3. Method & notice
1) Serial number D/L is using of scan equipment.
2) Setting of scan equipment operated by Manufacturing
Technology Group.
3) 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.
1) Press the ‘instart’ key of ADJ remote controller.
2) Go to the menu ‘5.Model Number D/L’ like below photo.
3) Input the Factory model name(ex 42LH4000-ZA) or Serial
number like photo.
4) Check the model name Instart menu -> Factory name
displayed (ex 42LH4000-ZA)
5) Check the Diagnostics (DTV country only) ->s Buyer model
displayed (ex 42LH4000)
CMD LENGTHADH ADL DATA_1. . . Data_n CS DELAY
No. Adjust mode CMD(hex) LENGTH(hex
)
Description
1
EEPROM WRITE
A0h
84h+n
n-bytes Write (n = 1~16)
Page 14
- 14 -
LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
300
200
200T
200N
120
122
400
500
510
521
530
540
550
801
805
802
804
803
800
821
900
910
LV1
A2
A10
A9
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
Page 15
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.
Vertical/Horizontal bar, residual image,
light spot, external device color error
No power6
Off when on, off while viewing, power auto
on/off
No audio/Normal video8
No response in remote controller, key error,
recording error, memory error
5
7
10
11External device recognition error11
12E. NoiseCircuit noise, mechanical noise12
13F. Exterior errorExterior defect13
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Page 27
Standard Repair Process
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
Established
date
Revised date
2008. 3 .05
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
No video
Normal audio
Normal
audio
N
Move to No
video/No audio
Y
Check Back Light
On with naked eye
Check Power Board 20V /12V or 24v output
On
Normal
voltage
Repair Power
Board or parts
Y
Check Power
Board
12v,5v etc.
N
Replace Inverter
Y
or module
N
Normal
voltage
Repair Power
Board or parts
N
End
Y
OR
1/13
Replace Main Board
Replace T-con
Board or module
And Adjust VCOM
Precaution
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
1
Re-enter White Balance value
Page 28
Standard Repair Process
LCD TV
symptom
No Video/
No audio
Error
Check various
voltages of Power
Board ( 5V,12V,20V
or 24V…)
A. Video error
No video/ No audio
Normal
voltage?
Replace Power
Board and repair
parts
Y
N
Check and
replace
MAIN B/D
Established
date
Revised date
End
2008. 3 .05
2/13
2
Page 29
Standard Repair Process
LCD TV
Check RF Signal level
Normal
Signal?
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Normal
Picture?
Y
Close
Y
N
Error
symptom
A. Picture Problem
Picture broken/ Freezing
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Menu
SetupDiagnostic)
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
DVD Player ,Set-Top-Box, Different maker TV etc`
Normal
Picture?
Contact with signal distributor
or broadcaster (Cable or Air)
Y
N
Check
S/W Version
SVC
Bulletin?
Y
S/W Upgrade
Normal
Picture?
Y
Established
date
Revised date
Menu
N
Booster menu
On
Off
N
2008. 3 .05
Setup Booster
Off: Check
On: Check
Tuner soldering
Normal
Picture?
N
Check
Replace
Main B/D
3/13
Y
Close
Close
3
Page 30
Standard Repair Process
LCD TV
Check color by input
-External Input
-COMPONENT
-RGB
-HDMI/DVI
Check Test pattern
Error
symptom
Color
error?
Check error
color input
mode
Check
and replace
Y
Link Cable
(LVDS) and
N
contact
condition
External Input/
Component
error
A. Video error
Color error
Color
error?
Check
external
device and
cable
Established
date
Revised date
2008. 3 .05
4/13
Other Module
Replace module
Y
Y
Replace Main B/D
N
Color
error?
N
Replace
T-Con
Board
And Adjust
VCOM
Y
Color
error?
N
LGD Module
Only
External device
/Cable
normal
N
End
Y
Replace Main B/D
RGB/
HDMI/DVI
error
Check external
device and
cable
4
Request repair
for external
device/cable
N
External device
/Cable
normal
Y
Replace Main B/D
Page 31
Standard Repair Process
A. Video error
LCD TV
Error
symptom
Vertical / Horizontal bar, residual image,
light spot, external device color error
Vertical/Horizontal bar, residual image, light spot
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
Check Test pattern
Screen
normal?
N
Replace
module
Check external
Y
device
connection
condition
Normal?
N
Request repair
for external
device
External device screen error-Color error
Check screen
condition by
Check S/W Version
Check
version
Y
S/W Upgrade
Normal
screen?
Y
End
N
N
input
-External Input
-Component
-RGB
-HDMI/DVI
5
Check and
Y
replace Link
Cable
External
Input
error
Component
error
RGB
error
HDMI/
DVI
Established
date
Revised date
LGD Module Only
Replace T-Con Board
And Adjust VCOM
Screen
normal?
End
N
Replace Main B/D
Y
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
2008. 3 .05
Other Module
Replace
Module
Screen
normal?
Replace module
in abnormal displaying
after exchanging T-Con B'd
Screen
normal?
Request repair for
external device
Screen
normal?
N
Replace
Main B/D
Y
Y
N
Replace
Main B/D
5/13
N
Y
End
Page 32
Standard Repair Process
LCD TV
Check
Power LED
. Stand-By: Red
. Operating: Green
Error
symptom
Power LED
On?
N
Check Power cord
was inserted properly
Y
Check & Repair
Mechanical Power switch
on Local control of TV
Normal?
N
B. Power error
Check ST-BY 5V
No power
DC Power on
by pressing Power Key
On Remote control
Y
Normal
Y
voltage?
Established
date
2008. 3 .05
Revised date
Normal
operation?
Measure voltage of each output of Power B/D
Normal
voltage?
N
Check Power
On ‘”High”
Y
Replace Main B/D
Y
N
Replace Main B/D
OK?
6/13
Replace
Y
Power
B/D
N
Y
Close
N
Replace Power
B/D
6
Replace Power B/D
’09 years new model apply mechanical power switch
to reduce power consumption in stand-by status.
If mechanical power switch off
Doesn’t turn on by remote control
Doesn’t appear LED light
Please refer to the A21 Page
Page 33
Standard Repair Process
LCD TV
Check outlet
Check A/C code
Check for 3 wave length
Error
symptom
Error?
Y
Fix A/C code & Outlet
and describe 3 wave
length
B. Power error
Off when on, off while viewing, power auto on/off
N
Check Power Off
Mode
(If Power Off mode
is not displayed)
Check Power B/D
voltage
Caution
Check and fix exterior
of Power B/D Part
Abnormal
Abnormal
Established
date
Revised date
CPU
1
Normal
voltage?
Replace Power B/D
Y
N
2008. 3 .05
Replace Main B/D
Replace Main B/D
7/13
Normal?End
Replace Power B/D
Y
N
* Please refer to the all cases which
can be displayed on power off mode.
StatusPower off ListExplanation
"POWEROFF_REMOTEKEY"Power off by REMOTE CONTROL
"POWEROFF_OFFTIMER" Power off by OFF TIMER
"POWEROFF_SLEEPTIMER"Power off by SLEEP TIMER
"POWEROFF_INSTOP"Power off by INSTOP KEY
"POWEROFF_AUTOOFF"Power off by AUTO OFF
Normal
Abnormal
"POWEROFF_ONTIMER"Power off by ON TIMER
"POWEROFF_RS232C"Power off by RS232C
"POWEROFF_RESREC"Power off by Reservated Record
"POWEROFF_RECEND"Power off by End of Recording
"POWEROFF_SWDOWN"Power off by S/W Download
"POWEROFF_UNKNOWN"Power off by unknown status except listed case
"POWEROFF_ABNORMAL1"Power off by abnormal status except CPU trouble
"POWEROFF_CPUABNORMAL" Power off by CPU Abnormal
7
Page 34
Standard Repair Process
LCD TV
No audio
Screen normal
Error
symptom
Check user
menu >
Speaker off
C. Audio error
No audio/ Normal video
N
Off
Y
Cancel OFF and describe
Check audio B+
20V or 24V of
Power Board
Established
date
Revised date
Normal
voltage
Replace Power Board and repair parts
Y
N
2008. 3 .05
8/13
Check
Speaker
disconnection
Disconnection
Y
Replace Speaker
8
N
Replace MAIN BoardEnd
Page 35
Standard Repair Process
LCD TV
Check input
signal
-RF
-External Input
signal
Error
symptom
C. Audio error
Wrecked audio/ discontinuation/noise
Established
date
Revised date
2008. 3 .05
Wrecked audio/discontinuation/noise is same after “Check input signal” compared to No audio
Signal
normal?
Y
N
(When RF signal is not
received)
Request repair to external
cable/ANT provider
(In case of
External Input
signal error)
Check and fix
external device
Wrecked audio/
Discontinuation/
Noise for
all audio
Wrecked audio/
Discontinuation/
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only
for External Input
Check and replace
speaker and
connector
Replace Main B/D
Connect and check
other external
device
Check audio
B+ Voltage (20V or 24V)
Normal
voltage?
N
Replace Power B/D
Replace Main B/D
Normal
audio?
Y
N
Y
9/13
End
Check and fix external device
9
Page 36
Standard Repair Process
D. General Function Problem
Remote control & Local switch checking
LCD TV
Error
symptom
1. Remote control (R/C) operating error
Check R/C itself
Operation
Check R/C Operating
When turn off light
in room
If R/C operate,
Explain the customer
cause is interference
from light in room.
operating?
Normal
Y
N
Check & Replace
Baterry of R/C
Normal
operating?
Replace R/C
Check & Repair
Cable connection
Connector solder
Close
N
Normal
operating?
Y
Close
N
Check B+ 5V
On Main B/D
Established
date
Revised date
Normal
Voltage?
Check 5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
Y
N
2008. 3 .05
Check IR
Output signal
10/13
Replace
Main B/D
Normal
Signal?
N
Repair/Replace
IR B/D
Y
2. Local(Mechanical) switch operating error
Check & Repair
Check R/C
Operation
Normal
operating?
Move
Power problem
Section
Y
Cable connection
Connector solder
N
Normal
operating?
Y
Close
Check & Replace
N
Assembly status
(Key PCB + tool )
10
Normal
operating?
Y
Close
N
Check Key
Output signal
Replace
Main B/D
Normal
Signal?
N
Repair/Replace
Local switch B/D
Y
Page 37
Standard Repair Process
LCD TV
Check
input
signal
Error
symptom
Y
Signal
input?
N
Check and fix
external device/cable
D. Function error
External device recognition error
Check technical
information
- Fix information
- S/W Version
Technical
information?
Fix in
accordance
with technical
information
Established
date
Revised date
External Input and
N
Y
Component
Recognition error
RGB,HDMI/
DVI, Optical
Recognition error
2008. 3 .05
11/13
Replace Main B/D
Replace Main B/D
11
Page 38
Standard Repair Process
LCD TV
Identify
nose
type
Error
symptom
Circuit
noise
Mechanical
noise
Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage.
Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
Check
location of
noise
Check location
of noise
Circuit noise, mechanical noise
E. Noise
Replace inverter
OR
Replace LIPS B/D
Established
date
Revised date
<With Inverter Module>
<Without Inverter Module>
When the nose is severe, replace the module
(For models with fix information, upgrade the
S/W or provide the description)
OR
If there is a “Tak Tak” noise from the
cabinet, refer to the KMS fix information and
then proceed as shown in the solution manual
OR
(For models without any fix information,
provide the description)
2008. 3 .05
12/13
12
Page 39
Standard Repair Process
LCD TV
Error
symptom
Zoom part with
exterior damage
Module
damage
Cabinet
damage
Remote
controller
damage
F. Exterior defect
Exterior defect
Replace module
Replace cabinet
Replace remote controller
Established
date
Revised date
Adjust VCOM
2008. 3 .05
13/13
Stand
dent
Replace stand
13
Page 40
LCD TV Repair Process Index
- Trouble shooting by input block (Component level check)
No.Symptom (L)Input BlockPageRemark
1Power ProblemPower-up Boot fail1~2
2
3Digital TV5
4Analog TV6
5AV (Scart / CVBS/ S-Video)7~12
6Component13
7RGB(D-SUB)14~15
8HDMI16~17
9
10Digital TV19
11Analog TV20
12 AV / Component / RGB, HDMI-PC/ HDMI-DTV21~26
13
Video Problem
Audio Problem
AV Audio out / No Audio (Headphone &
SPDIF)
No OSD3~4
All Input18
27~30
14USB / Remocon ProblemUSB no connect / Remocon31~33
15Intelligent SensorIntelligent Sensor34
Page 41
LCD TV
Symptom
Power-Up Boot Fail
Making
Revision
2009. 2 . 1
1/34
P800 Pin #7~#10
Voltage Level = 5V ?
YES
P800 Pin #2
Voltage level = 5V ?
YES
P800 Pin #13, 14 = 12V
P800 Pin #17, 18 = 24V ?
YES
MAIN B’D L803 = 3.3V ?Replace MAIN B’D IC801
YES
MAIN B’D L813 = 1.26V ?Replace MAIN B’D IC805
YES
MAIN B’D L805 = 3.3V ?Replace MAIN B’D IC806
NOYES
NO
NO
NO
NO
NO
Check Power connector
OK ?
Replace MAIN B’D Q801
Replace Power Board
Replace Power Board
26~42LH2000
32~47LH3000/LH4000
YES
Check MAIN B’D X100 Clock
12MHz
YES
Replace MAIN B’D IC102
NAND FLASH
NO
NO
Replace MAIN B’D IC100
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D
IC300, IC301 DDR2 Memory
NO
Replace MAIN B’D IC100
Page 42
LCD TV
Symptom
Power-Up Boot Fail
Making
Revision
2009. 2 . 1
2/34
19~22LH2000
P801 Pin #5~#6
Voltage Level = 5V ?
YES
P801 Pin #1, 2 = 15V?
YES
MAIN B’D L803 = 3.3V ?
YES
MAIN B’D L813 = 1.26V ?
YES
MAIN B’D L805 = 3.3V ?
YES
Check MAIN B’D X100 Clock
12MHz
Check Power connector
NOYES
Replace Power Board
NO
Replace MAIN B’D IC801
NO
Replace MAIN B’D IC805
NO
Replace MAIN B’D IC806
NO
Replace MAIN B’D IC100
NO
OK ?
Replace Power Board
YES
Replace MAIN B’D IC102
NAND FLASH
NO
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D
IC300, IC301 DDR2 Memory
Replace MAIN B’D IC100
NO
Page 43
LCD TV
Symptom
No OSD
Making
Revision
2009. 2 . 1
3/34
26~42LH2000
32~47LH3000/LH4000
P800 Pin #13, 14 = 12V
P800 Pin #17, 18 = 24V ?
YES
P800 Pin #20
Voltage level = 2V
YES
MAIN B’D L1300 = 12V ?Replace MAIN B’D Q806
YES
Check LVDS Cable
OK ?
NO
Replace LVDS Cable
NOYES
NO
NO
YES
Check Power connector
OK ?
Replace MAIN B’D Q802
Replace Main Board
Replace Power Board
Page 44
LCD TV
Symptom
No OSD
Making
Revision
2009. 2 . 1
4/34
19~22LH2000
P801 Pin #1, 2 = 15V?
NO
YES
P801 Pin #9
Voltage level = 2V
YES
MAIN B’D L1300 = 12V ?Replace MAIN B’D Q806
YES
Check LVDS Cable
OK ?
NO
Replace LVDS Cable
NO
NO
YES
Check Power connector
OK ?
Replace MAIN B’D Q802
Replace Main Board
YES
Replace Power Board
Page 45
LCD TV
Check RF Cable
YES
Symptom
Digital TV Video Problem
Making
Revision
2009. 2 . 1
5/34
26~42LH2000
32~47LH3000/LH4000
MAIN B’D L1201 = 5V ?
YES
MAIN B’D L1202 = 3.3V ?
YES
MAIN B’D IC804
Pin #2 = 1.2V ?
YES
MAIN B’D R1210 Clock ?
Replace MAIN B’D IC808
NO
Replace MAIN B’D IC809
NO
Replace MAIN B’D IC804
NO
Replace MAIN B’D TU1200
NO
Page 46
LCD TV
Check RF Cable
YES
Symptom
Analog TV Video Problem
Making
Revision
2009. 2 . 1
6/34
26~42LH2000
32~47LH3000/LH4000
MAIN B’D L1201 = 5V ?
YES
MAIN B’D L1202 = 3.3V ?
YES
MAIN B’D IC804
Pin #2 = 1.2V ?
YES
MAIN B’D R1210 Clock ?
Replace MAIN B’D IC808
NO
Replace MAIN B’D IC809
NO
Replace MAIN B’D IC804
NO
Replace MAIN B’D TU1200
NO
Page 47
LCD TV
Check Signal format
Is it supported?
YES
Check the SCART Cable
YES
Symptom
AV1(Scart CVBS) No Video
Problem
Making
Revision
2009. 2 . 1
7/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D R1117
Video Signal ?
YES
Check MAIN B’D C210
Video Signal ?
YES
Replace MAIN B’D IC 100
NO
NO
MAIN B’D JK1100 CheckReplace MAIN B’D JK1100
NO
Replace
MAIN B’D C210
Page 48
LCD TV
Check Signal format
Is it supported?
YES
Check the SCART Cable
YES
Symptom
AV1(Scart RGB) No Video
Problem
Making
Revision
2009. 2 . 1
8/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D JK1100
YES
Check MAIN B’D C200 (RED)
C201 (GREEN)
C202 (BLUE)
Video Signal ?
YES
Replace MAIN B’D IC 100
NO
NO
Replace MAIN B’D JK1100
Replace
MAIN B’D C200, C201, C202
Page 49
LCD TV
Check Signal format
Is it supported?
YES
Check the SCART Cable
YES
Symptom
AV2 No Video Problem
Making
Revision
2009. 2 . 1
9/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D R1133
Video Signal ?
YES
Check MAIN B’D C211
Video Signal ?
YES
Replace MAIN B’D IC 100
NO
NO
MAIN B’D JK1101 CheckReplace MAIN B’D JK1101
NO
Replace MAIN B’D C211
Page 50
LCD TV
Check Signal format
Is it supported?
Check the CVBS Cable
YES
YES
Symptom
AV3(CVBS) No Video Problem
Making
Revision
2009. 2 . 1
10/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D R400
Video Signal ?
YES
Check MAIN B’D C217
Video Signal ?
YES
Replace MAIN B’D IC 100
NO
NO
MAIN B’D JK402 CheckReplace MAIN B’D JK402
NO
Replace MAIN B’D C217
Page 51
LCD TV
Check Spec (Refer to User Manual)
Is it supported?
Check the SCART Cable
Symptom
YES
YES
AV1 No Video Out Problem
Making
Revision
2009. 2 . 1
11/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D C1107
Video Signal ?
NO
Check MAIN B’D R1205
Video Signal ?
YES
Replace MAIN B’D Q1205
MAIN B’D JK1100 Check
YES
Check the Trouble Shooting Guide
Analog TV No video
NO
Page 52
LCD TV
Check Spec (Refer to User Manual)
Is it supported?
Check the SCART Cable
Symptom
YES
YES
AV2 No Video Out Problem
Making
Revision
2009. 2 . 1
12/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D C1122
Video Signal ?
NO
Replace MAIN B’D IC 100
MAIN B’D JK1101 Check
YES
Page 53
LCD TV
Check Signal format
Is it supported?
Check the Component Cable
Symptom
YES
YES
Component No Video/
No Color Problem
Making
Revision
2009. 2 . 1
13/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D R419
Video Signal ?
YES
Check MAIN B’D C209, C215 (Y)
C216 (Pb)
C214 (Pr)
Video Signal ?
YES
Replace MAIN B’D IC 100
NO
MAIN B’D JK400 CheckReplace MAIN B’D JK400
NO
Replace
NO
MAIN B’D C209 or C214 or C215 or C216
Page 54
LCD TV
Check Signal format
Is it supported?
Check the RGB Cable
MAIN B’D P400 Pin #2
Video signal ?
R437 has Vsync ?
R440 has Hsync ?
YES
YES
YES
Symptom
NO
RGB No Video Problem
MAIN B’D P400 CheckReplace MAIN B’D P400
NO
Making
Revision
2009. 2 . 1
14/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D C208 (Video)
R246 (HSYNC)
R245 (VSYNC)
YES
Replace MAIN B’D IC 100
NO
Replace
MAIN B’D C208 or R246 or R247
Page 55
LCD TV
Check Signal format
Is it supported?
YES
Check the RGB Cable
YES
MAIN B’D P400
Pin #3 (BLUE)
Pin #2 (GREEN)
Pin #1 (RED)
Video signal ?
YES
Check MAIN B’D C212 (RED)
C207 (GREEN)
C213 (BLUE)
Video Signal ?
Symptom
NO
RGB No Color Problem
MAIN B’D P400 CheckReplace MAIN B’D P400
NO
Replace
NO
MAIN B’D C212 or C207 or C213
Making
Revision
2009. 2 . 1
15/34
26~42LH2000
32~47LH3000/LH4000
YES
Replace MAIN B’D IC 100
Page 56
LCD TV
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Symptom
HDMI 1~3 All No Video Problem
Making
Revision
2009. 2 . 1
16/34
26~42LH2000
32~47LH3000/LH4000
Check the ADJUST MENU
EDID OK ?
YES
Replace
MAIN B’D IC107 (HDCP KEY)
NO
Replace MAIN B’D IC 100
Download EDID
(Refer to Adjustment Spec)
NO
HDMI1 – ALL MODELS
HDMI2 – Except for 19/22LH20**
HDMI3 – Except for 19/22LU40**, 19/22LU50**, 19/22LH20**
Page 57
LCD TV
Check Signal format
Is it supported?
YES
Check the HDMI Cable
YES
MAIN B’D JACK Check
JK600 -> HDMI1
JK601 -> HDMI2
JK602 -> HDMI3
YES
Symptom
HDMI1 or 2 or 3 No Video
Problem
Making
Revision
2009. 2 . 1
17/34
26~42LH2000
32~47LH3000/LH4000
Replace MAIN B’D IC 100
_ This case is that HDMI Video doesn’t display at the some HDMI input, not all.
HDMI1 – ALL MODELS
HDMI2 – Except for 19/22LH20**
HDMI3 – Except for 19/22LU40**, 19/22LU50**, 19/22LH20**
Page 58
LCD TV
Check The Speaker
YES
Symptom
NO
All Source no Audio Problem
Replace Speaker
Making
Revision
2009. 2 . 1
18/34
26~42LH2000
32~47LH3000/LH4000
Check Speaker Cable
YES
CHECK MAIN B’D
JK700 or JK701
YES
MAIN B’D
L700 = 1.8V
YES
MAIN B’D
Check R720, R721, R722
Signal
YES
MAIN B’D
L705 Pin #1
L704 Pin #2
PWM Signal ?
NO
NO
NO
NO
NO
Replace Speaker Cable
Replace MAIN B’D
JK700 or JK701
Replace MAIN B’D IC803
Replace MAIN B’D IC100
Check P700 Cable
_ If headphone is connected, Speaker sound doesn’t work.
Replace MAIN B’D IC701
NO
YES
Replace MAIN B’D IC 701
Page 59
LCD TV
Digital TV Video OK ?
YES
Replace MAIN B’D IC 100
Symptom
Digital TV No Audio Problem
Making
Revision
2009. 2 . 1
19/34
26~42LH2000
32~47LH3000/LH4000
Page 60
LCD TV
Analog TV Video OK ?
YES
Symptom
Analog TV No Audio Problem
Making
Revision
2009. 2 . 1
20/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D
C231 Signal (SIF)
NO
MAIN B’D TU1200
Pin #17 Signal (SIF)
YES
Replace MAIN B’D IC100
Replace MAIN B’D TU1200
NO
Page 61
LCD TV
AV1 Video OK ?
YES
Check the SCART Cable
YES
Check MAIN B’D JK1100Replace MAIN B’D JK1100
YES
MAIN B’D
C229 (Right Sound)
C230 (Left Sound)
signal ?
Symptom
NO
YES
AV1 No Audio Problem
Replace MAIN B’D IC 100
Making
Revision
2009. 2 . 1
21/34
26~42LH2000
32~47LH3000/LH4000
NO
Check MAIN B’D
C229, C230
Page 62
LCD TV
AV2 Video OK ?
YES
Check the SCART Cable
YES
Check MAIN B’D JK1101Replace MAIN B’D JK1101
YES
MAIN B’D
C2008 (Right Sound)
C2009 (Left Sound)
signal ?
Symptom
NO
YES
AV2 No Audio Problem
Replace MAIN B’D IC 100
Making
Revision
2009. 2 . 1
22/34
26~42LH2000
32~47LH3000/LH4000
NO
Check MAIN B’D
C2008, C2009
Page 63
LCD TV
AV3 Video OK ?
YES
Check the CVBS Cable
YES
Check MAIN B’D JK402Replace MAIN B’D JK402
YES
MAIN B’D
C2011 (Right Sound)
C2012 (Left Sound)
signal ?
Symptom
NO
YES
AV3 No Audio Problem
Replace MAIN B’D IC 100
Making
Revision
2009. 2 . 1
23/34
26~42LH2000
32~47LH3000/LH4000
NO
Check MAIN B’D
C2011, C2012
Page 64
LCD TV
Component Video OK ?
YES
Check the CVBS Cable
YES
Symptom
Component No Audio Problem
Making
Revision
2009. 2 . 1
24/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D JK400Replace MAIN B’D JK400
YES
MAIN B’D
C2013 (Right Sound)
C2014 (Left Sound)
signal ?
NO
Check MAIN B’D
C2013, C2014
NO
Replace MAIN B’D IC 100
YES
Page 65
LCD TV
RGB Video OK ?
YES
Check the PC Audio Cable
YES
Symptom
RGB, HDMI-PC No Audio Problem
Making
Revision
2009. 2 . 1
25/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D JK401Replace MAIN B’D JK401
YES
MAIN B’D
C2015 (Right Sound)
C2016 (Left Sound)
signal ?
NO
Check MAIN B’D
C2015, C2016
NO
Replace MAIN B’D IC 100
YES
Page 66
LCD TV
HDMI Video OK ?
YES
Symptom
HDMI-DTV No Audio Problem
Making
Revision
2009. 2 . 1
26/34
26~42LH2000
32~47LH3000/LH4000
Check the ADJUST MENU
EDID OK ?
YES
Check the HDMI Cable
Download EDID
(Refer to Adjustment Spec)
NO
Replace MAIN B’D IC100
YES
Page 67
LCD TV
Symptom
AV1 No Audio Out Problem
Making
Revision
2009. 2 . 1
27/34
26~42LH2000
32~47LH3000/LH4000
Analog TV Audio OK
YES
Check the SCART Cable
YES
Check MAIN B’D JK1100Replace MAIN B’D JK1100
YES
MAIN B’D
R239 (Right Sound)
R240 (Left Sound)
signal ?
YES
Replace MAIN B’D
IC1103
NO
NO
NO
Check the Trouble Shooting Guide
Analog TV No video
Replace MAIN B’D IC 100
Page 68
LCD TV
Symptom
AV2 No Audio Out Problem
Making
Revision
2009. 2 . 1
28/34
26~42LH2000
32~47LH3000/LH4000
Speaker Audio OK
NO
YES
Check the SCART Cable
YES
Check MAIN B’D JK1101Replace MAIN B’D JK1101
NO
YES
MAIN B’D
R250 (Right Sound)
R251 (Left Sound)
signal ?
YES
Replace MAIN B’D
IC1103
NO
Check the Trouble Shooting Guide
Related to Audio Problem
Replace MAIN B’D IC 100
Page 69
LCD TV
Symptom
Headphone No Audio Problem
Making
Revision
2009. 2 . 1
29/34
26~42LH2000
32~47LH3000/LH4000
Speaker Audio OK
YES
Check the Headphone Cable
YES
Check MAIN B’D JK700 or JK701Replace MAIN B’D JK700 or JK701
YES
MAIN B’D
R237 (Right Sound)
R238 (Left Sound)
signal ?
YES
Replace MAIN B’D
IC700
NO
NO
Check the Trouble Shooting Guide
Related to Audio Problem
NO
Replace MAIN B’D IC 100
Page 70
LCD TV
Symptom
SPDIF No Audio Problem
Making
Revision
2009. 2 . 1
30/34
26~42LH2000
32~47LH3000/LH4000
Speaker Audio OK
NO
YES
Check the SPDIF Cable
YES
Check MAIN B’D JK403Replace MAIN B’D JK403
NO
YES
Check MAIN B’D R230
PWM Signal ?
NO
Replace MAIN B’D IC 100
Check the Trouble Shooting Guide
Related to Audio Problem
Page 71
LCD TV
Check that the USB Memory & HDD are supported by Spec
(Refer to User Manual’s USB cautions)
YES
Symptom
USB No Connect Problem
Making
Revision
2009. 2 . 1
31/34
32~47LH4000
Check MAIN B’D
JK405 OK ?
YES
Check MAIN B’D
JK405 Pin #1 5V ?
NO
Check MAIN B’D
R801 5V ?
NO
Check MAIN B’D
R848 12V ?
Replace MAIN B’D JK405
NO
Replace MAIN B’D IC 100
YES
Replace MAIN B’D IC402
YES
Replace MAIN B’D IC808
YES
Page 72
LCD TV
Symptom
Remote Control Problem
Making
Revision
2009. 2 . 1
32/34
26~42LH2000
32~47LH3000/LH4000
Check MAIN B’D P1304
Wafer & Connector
YES
Check IR B’D P1 Wafer
& Connector
Replace it
NO
Replace IR B’D
YES
Page 73
LCD TV
Symptom
Remote Control Problem
Making
Revision
2009. 2 . 1
33/34
19~22LH2000
Check MAIN B’D P1305
Wafer & Connector
YES
IR B’D IC1 Pin #3
Voltage 4V
Check IR B’D P1 Wafer
& Connector
?
NO
NO
YES
NO
Replace it
Replace IR B’D IC1
Replace MAIN B’D IC100
Replace MAIN B’D IC100
NO
Page 74
LCD TV
Symptom
Intelligent Sensor Problem
Making
Revision
2009. 2 . 1
34/34
32~47LH4000
Check MAIN B’D P1304
Wafer & Connector
YES
Check IR B’D P1 Wafer
& Connector
Replace it
NO
Replace IR B’D
YES
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