LCD TelevisionRepair Guide Handbook
2
Woofer Speaker
Power Board
Main Board
Driver Board
T con Board
Local Key
IR WiFi
Board RF Board
General 1. ‘13 LCD TV layout structure Overview
3
Power LEDOn?
Y
N Y
N
Check Power cordwas inserted properly
Replace Power B/D
Measure voltage for each output of Power B/D
N
Y Replace Main B/D
Y
N
Replace Main B/D
N
Y
Replace Power B/D
N
Replace Power B/D
Y
- Stand-By: Red light or Turn Off - Power on Condition: Turn Off
※
inserted properly
OK?
OperationOK?
Voltage OK?(3.5V)
Voltage OK?(12V,3.5V)
Voltage OK?(3.3V)
Close
☞Page 6~7
☞Page 6~7
-DC Power on: Switch on the TV with local key or remote controller-AC Power on: Switch on the TV with power supply(outlet)
Measure voltage “Power On” line with Tester
“DC Power on”by pressing Power Key with Remote controller
Check Front Display LED light Status
☞Page 5
Check ST-BY 3.5VMeasure votage 3.5V pin with Tester
<Power Pin Voltage Spec>
OutputVoltageVariable
range3.5V
(ST-BY)3.325V~3.67
5V12V 11.4~12.6V24V 21.6V~27V
Repair Method by Symptoms 3-1. No Power Check(Flow Chart)
4
Check the ST-BY(3.5V) and Power on(3.3V)
24 Pin (Power Board ↔ Main Board)1 Power on(3.3V) 2 24V
3 24V 4 24V
5 GND 6 GND
7 GND 8 GND
9 ST-BY (3.5V) 10 ST-BY (3.5V)
11 ST-BY (3.5V) 12 ST-BY (3.5V)
13 GND 14 GND
15 GND 16 GND
17 12V 18 Inverter On/off
19 12V 20 Lamp : A-DimLED : N.C
21 12V 22 PWM Dim #1
23 N.C • Lamp SCANNING Model: PWM Dim #2
24 Error-out
Direct LEDPower Board
Edge LEDPower Board
<Check Power on (3.3V) and ST-BY(3.5V)> 1. Power Sequence : AC IN→ST-BY3.5V→P-ON→12V,24V→INV ON2. ST-BY3.5V: Power Board → Main Board Micom IC/Power LED /IR Voltage3. 24V: Power Board → Main Board Sound IC /LED Driver Voltage4. 12V: Power Board → Main Board /Module Voltage
The “LED” refers only to the type of lighting source used to illuminate the LCD pixels in the television1. Direct LED: Direct type term refers to televisions that use a full panel of LEDs to illuminate the pixels.2. Edge LED: Edge LED,means the LEDs that illuminate the pixels are located only on the edges of the set.
3.5V
3.3V
Repair Method by Symptoms 3-2. No Power Check(check method)
5
`13 Model LA Series 24 Pin (Power Board ↔ Main Board)
1 Power on(3.3V)
2 Inverter On/off(3.3V)
3 ST-BY(3.5V) 4 PWM Dim #1
5 ST-BY(3.5V) 6 PWM Dim #2
7 GND 8 GND
9 24V 10 24V
11 GND 12 GND
13 12V 14 12V
15 12V 16 24V
17 GND 18 GND
19 GND 20 GND
21 GND 22 L/DIMO_VS
23 L/DIM0_MOSI 24 L/DIM0_SCLK18 Pin (Power Board ↔ Main Board)
1 Power on(3.3V) 2 Inverter On/off
3 ST-BY(3.5V) 4 PWM Dim #1
5 ST-BY(3.5V) 6 PWM Dim #2
7 GND 8 GND
9 24V 10 24V
11 GND 12 GND
13 12V 14 12V
15 12V 16 24V
17 GND 18 GND
<Check Power on (3.3V) and ST-BY(3.5V)>
Direct LEDPower Board
Edge LEDPower Board
3.3V
3.5V
Repair Method by Symptoms 3-2. No Power Check(Check method)
6
Pin No. Items Description of service and functions
24 ERROR The Inverter or HV signals whether the Lamp Turn-on functions normally
23 NC Null terminals
22 P-DIM The CPU automatically adjusts the brightness, based on the wave pattern of elements communicated (for each picture mode)
20 A-DIM The CPU customizes the brightness of Lamp as to each different brightness of picture (a serial current wave)
18 INV ON/OFF Signals for Inverter, controlled by MICOM
17,19,21 12V Power Supply to Main Board/Module
15,16 GND
13,14 GND
11,12 3.5V ST-BY
9,10 3.5V ST-BY
7,8 GND
5,6 GND
2,3,4 24V Sound IC B+ Voltage
1 Power On A Voltage required to turn Multi Voltages ON, Input by MICOM(Voltage: 3.3V)
Repair Method by Symptoms 3-3. No Power Check(Power Pin Description)
7
Y
N
Y
N
Y
N
Replace module
Repair Power Board or parts
Check Power Board 24v output
Y Replace Inverter or module
N
Repair Power Board or parts
End
First of all, Check whether all of cables between board are inserted properly or not.(Main B/D↔ Power B/D, LVDS Cable, Speaker Cable, IR B/D Cable,,,)
Y
Replace Power Board
N End
Case1. No Picture with audio working conditionCase2. No Picture with audio not working condition
☞Page 10~12
☞Page 10~12
SoundWorkingproperly
Back light“On”
CheckVoltage
12V, 3.5V
VoltageOK?
Check Back Lightwhether “On ”or off with naked eye
Check Power Board 12V, 3.5V line
No Picture
Check Power Board 3.5V,12V,24 line
Check and replace MAIN B/D
VoltageOK?
Case 1
Case 2
No Picture with Sound not working conditon
<Power Pin Voltage Spec>
OutputVoltageVariable
range3.5V
(ST-BY)3.325V~3.67
5V12V 11.4~12.6V24V 21.6V~27V
Repair Method by Symptoms 4-1. No Picture Check(Flow Chart)
8
<LK Series>
<LW Series>
24 Pin (Power Board ↔ Main Board) - 공통
1 Power on(3.3V) 2 24V
3 24V 4 24V
5 GND 6 GND
7 GND 8 GND
9 ST-BY(3.5V) 10
ST-BY(3.5V)
11 ST-BY(3.5V) 12
ST-BY(3.5V)
13 GND 14
GND
15 GND 16
GND
17 12V 18
Inverter On/off
19 12V 20
A-Dim
21 12V 22
PWM Dim
23 N.C (only Lamp
SCANNING Model : PWM Dim #2)
24
Error-out
Screen (LK, LW)
ERRORP-DIMA-DIMINV-ONGNDGND3.5V3.5VGNDGND24V24V
NC12V12V12VGNDGND3.5V3.5VGNDGND24VON/OFF
Check the DC 24V, 12V, 3.5V
Repair Method by Symptoms 4-2. No Picture Check(Check Power Pin)
9
24 Pin (Power Board ↔ Main Board) - 공통
1 Power on(3.3V) 2 24V
3 24V 4 24V
5 GND 6 GND
7 GND 8 GND
9 ST-BY(3.5V) 10
ST-BY(3.5V)
11 ST-BY(3.5V) 12
ST-BY(3.5V)
13 GND 14
GND
15 GND 16
N.C(Only LPB : V-
sync)
17 12V 18
Inverter On/off
19 12V 20
N.C(LPB, Lamp : A-
dim)
21 12V 22
PWM Dim #1
23 N.C (only Lamp
SCANNING Model : PWM Dim #2)
24
Error-out
Screen (LM)<Check power On(3.3V) and DC 24V, 12V, 3.5V>Check the DC 24V, 12V, 3.5V Direct LED
Power Board
3.5V
24V
12V
Repair Method by Symptoms 4-2. No Picture Check(Check Power Pin)
10
<Check power input voltage and DC 24V, 12V, 3.5V>
24 Pin (Power Board ↔ Main Board) 1 Power on 2 Inverter On/off
3 3.5V 4 PWM Dim #1
5 3.5V 6 PWM Dim #2
7 GND 8 GND
9 24V 10
24V
11 GND 12
GND
13 12V 14
12V
15 12V 16
24V
17 GND 18
GND
19 GND 20
GND
21 GND 22
L/DIMO_VS
23 L/DIM0_MOSI 24
L/DIM0_SCLK
18 Pin (Power Board ↔ Main Board)
1 Power on 2 Inverter On/off
3 3.5V 4 PWM Dim #1
5 3.5V 6 PWM Dim #2
7 GND 8 GND
9 24V 10 24V
11 GND 12 GND
13 12V 14 12V
15 12V 16 24V
17 GND 18 GND
Screen (LA)
Check the DC 24V, 12V, 3.5V
Direct LEDPower Board
Repair Method by Symptoms 4-2. No Picture Check(Check Power Pin)
11
Direct LED Power Board
Edge LEDPower Board
P203
1~5 12V
6~10 GND
P202
1~5 24V
6~10 GND
11 Error
12 Inverter ON( 3.3V)
13 A-dim
14 P-dim
Check the DC 24V and Inverter on
Repair Method by Symptoms 4-3. No Picture Check(Check LED Driver 24V )
12
No sound N
Y
Cancel OFF
Check audio B+ 24V of Power Board
Y
N
Replace Power Board
N
Y
Replace Speaker
End
<No Sound with Picture working condition>
SpeakerOff
CheckVoltage
(24V)
☞Page 15~16Check User menu speaker off
Check Speaker Cable Disconnection
Replace main BoardDisconnection
Repair Method by Symptoms 5-1. No Sount Check(Flow Chart)
13
‘13 LA Series
24 Pin (Power Board ↔ Main Board)
1 Power on 2 INV ON3 3.5V 4 PDIM#15 3.5V 6 PDIM#27 GND 8 GND9 24V 10 24V
11 GND 12 GND13 12V 14 12V15 12V 16 24V17 GND 18 GND
Checking method(direction) when there is no sound
①
②
<No Sound/Picture OK >
① Check the contact condition of or 24V connector of Main Board
② Measure the 24V input voltage supplied from Power Board (If there is no input voltage, check the connector)
Power BoardMain Board
Repair Method by Symptoms 5-2. No Sount Check(Troubleshooting)
14
ScreenOK?
N
YCheck external device connection condition
Y
N
Check and replace Link Cable
Good?
Y
NScreenOK? Replace Main B/D
Replace module
End
Vertical/Horizontal bar, residual image, light spot
Request repair for external device
☞Page 62
Y
N
ReplaceModule
ScreenOK?
End
☞ Page 31
Check Test pattern
6. Picture Error
Check color condition by input-External Input-Component-RGB-HDMI/DVI
Board Check method
Repair Method by Symptoms 6. Picture Error Check(Flow Chart)
15
Category Items Failure Cause Conditions
MainB/D
ICPicture
distortionFailure in I2C communication between MICOM and Main IC
MainB/D
ICPicture
distortionPicture occasionally cracked by the soldering on Main IC
MainB/D
ICPicture
distortionPicture cracking due to poor soldering on Main IC
MainB/D
ICPicture
distortionR-color noise caused by poor soldering on Main IC
Repair Method by Symptoms 7-1. Sysmptoms List(Main Board)
16
Category Items Failure Cause Conditions
MainB/D
ICPicture
distortion Mosaics generated from poor inside Main IC
MainB/D
ICPicture
distortionPicture cracking from poor service of an element inside Main IC
MainB/D
IC Static screen Screen frozen from a poor feature in Main IC
MainB/D
IC No sound No sound due to a poor feature in Audio IC
Repair Method by Symptoms 7-1. Sysmptoms List(Main Board)
17
Category Items Failure Cause Conditions
SpeakerCable
Poor processing
Noise in sound
A “woong ~” sound from the right Speaker caused by a speared damage in Sound Cable
Speaker System
Poor processing
Noise in sound
A noise and vibration produced from influx of alien materials into Speaker System
Speaker System
Poor processing
Noise in sound
A noise and vibration produced from influx of alien materials into Speaker System
FFCCable
Poor contactPicture
crackingPicture cracking around the contour from poor contact between FFC Cable PINs
Repair Method by Symptoms 7-1. Sysmptoms List(Main Board)
18
Category Items Failure Cause Conditions
Module Panel Vertical barsVertical bars caused by a irregular feature in the Panel
Module Panel Vertical barsVertical bars caused by a irregular feature in the Panel
Module Panel Vertical barsVertical bars caused by a irregular feature in the Panel
Module Panel Dark screen Screen getting partially dark by a defect inside the Panel
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
19
Category Items Failure Cause Conditions
Module Driver B/D Dark screenScreen getting partially dark by a failure in MODULE DRIVER B/D
Module Panel Vertical barsVertical bars caused by a poor feature in the Panel
Module Driver B/D1/3 part of
Screen getting dark
1/3 part of Screen (left/center/right) getting dark due to a defective feature in Driver B/D
Module Panel Alien materialsInflux of alien materials into the Module during the assembling process
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
20
Category Items Failure Cause Conditions
ModuleConnector
s1/2 of Picture
crackingPicture cracking from contamination by foreign materials inside a connector
Module Panel Dark screen Screen getting dark from a defect in LED unit inside the Panel
Module Panel Vertical barsVertical bars caused by a defective feature in the Panel
Module Panel Vertical barsVertical bars caused by a defective feature in the Panel
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
21
Category Items Failure Cause Conditions
Module PanelScreen partially
too brightScreen partially getting too bright from a failure in LED inside the Panel
Module PanelAlien materials
insideMoisture inflow into the product
Module Panel Film separation Film separation from defective processing
Processing failure
Processing failure Shipment
setting failure With the Shipment setting inapplicable, Shipment is made only in a control mode
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
22
Category Items Failure Cause Conditions
T-ConB/D
EOSVertical bars
evenly spacedDamage in Electrical Over Stress
T-ConB/D
EOSVertical bars
evenly spacedDamage in Electrical Over Stress
T-ConB/D
EOSPicture
distortion Poor features in T-CON
T-ConB/D IC Picture
distortion
Picture cracking from a poor feature in T-CON IC
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
23
Category Items Failure Cause Conditions
T-ConB/D
ICPicture
distortionPicture cracking from a poor feature in 3D Formatter IC
T-ConB/D
ICPicture
distortionPicture cracking from contamination around 3D Formatter IC
T-ConB/D
ICPicture
distortionPicture cracking from an error in Boot Data
T-ConB/D
ICPicture
distortionPicture cracking from an error in Boot Data
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
24
Category Items Failure Cause Conditions
T-ConB/D IC Picture
distortionPicture cracking due to desquamation of FRC IC
T-ConB/D IC Picture
distortionPicture cracking due to desquamation of FRC IC
Repair Method by Symptoms 7-2. Sysmptoms List(Module)
25
Category Items Failure Cause Conditions
LVDSCable
Poor contact
Picture distortion
Picture cracking along the contour from poor contact between LVDS Cable PINs
LVDSCable
Poor contact
Picture distortion
Picture cracking from poor contact between LVDS Cable PINs
LVDSCable
Poor contact
Picture distortion
Picture cracking along the contour from poor contact between LVDS Cable PINs
Repair Method by Symptoms 7-3. Sysmptoms List(LVDS Cable)
26
Category Items Failure Cause Conditions
FFCCable
Poor contact
Picture distortion
Picture cracking along the contour caused by poor contact between FFC Cable Pins
Processing failure
Processing failure
Shipment setting failure
With the Shipment setting inapplicable, Shipment is made only in a control mode
Cabinet ICM Filter Desquamation of ICM Filter
Some space made Inside from tear-off of ICM Filter caused by a external shock
Cabinet DamageVibration and
noise in Speaker System
Speakers shaking from some damage in the Cabinet Speaker Boss
Repair Method by Symptoms 7-3. Sysmptoms List(FFC Cable, Cabinet, etc)
27
Mosaic Patterns Picture Distortion
Picture Smear
Repair Method by Parts 8. Main Board Check (Symptoms)
28
Color smearing
1. Symptoms : Screen color smearing intermittently
2. Cause of failure : Link cable contact fault
<Check Point> <Repiar method> 1. Check RGB pattern with ‘ADJ Key through SVC Remote
2. Link cable by gently tapping the contact area on the symptoms of hand Checked
3. Link cable disassembly and re-assemble
4. Check whether the screen display is normal.
Repair Method by Parts 8. Main Board Check (One-Point Repair)
29
1. Symptoms : Auto Power On/Off
2. Cause of failure : Main board failure
<Check Point> <Repiar method>
1.Press Button ‘In-Start Mode’ Key2.Enter ‘Power Off Status’
1.If there are “POWER_OFF_BY_NO_ POLLING” message
2. Replace the main board
3. Check the condition of Screen
*POWER_OFF_BY_NO_POLLING :If there are no communications between micom and Host CPU for 15second → Micom will reboot all system
Repair Method by Parts 8. Main Board Check (One-Point Repair)
30
Output voltage of US1
PANEL VCC : F1 or C1(12V) VGL : C251 (-6V) VCC : C215 (3.3V)VGH : R271 (28V)VDD : C239 (16V)
A failure condition
P VCC
VGH
VCC
VGL
VDD
* P-VCC: A standard voltage to activate the LCD VCC: Usually 3.3V power required to activate Digital IC VDD: A voltage supplied to Source Drive IC for activation of LCD VGL/VGH: Voltages required to turn TFT Gate on/off -VGL: TFT Gate on -VGH: TFT Gate off
1.Title: No Display (Only BackLight or multiple vertical bars)
- Sound Normal/CH Volume Control Normally
2. Applied to: LK, LW57, and 65
3. Troubleshooting: As shown below, inspect the P-VCC(12V) B/D inside T-CON
and US1 output voltage.
Upon an abnormal voltage, open and re-check the FFC leading from T-CON to the Module.
Upon recurrence of a same failure, change T-CON or the Module if the voltage is normal.
(Refer to below Normal Voltage)T-Con Board
Repair Method by Parts 9. Module Check(One Point Repair)
31
Input voltage of LVDS Output voltage of IC 401 output
P VCC : P701 48~51 PIN (12V)
P701
P VCCVCC
VDD
VGH VGL
VCC : D403 (3.3 V) VDD : D402 (16V) VGH : D400 (27V) VGL : C450 (-5V)
A failure condition
No picture (Only backlight)
* P-VCC: A standard voltage to activate the LCD VCC: Usually 3.3V power required to activate Digital IC VDD: A voltage supplied to Source Drive IC for activation of LCD VGL/VGH: Voltages required to turn TFT Gate on/off -VGL: TFT Gate on -VGH:TFT Gate off
1.Title: No Display (Only BackLight)
- Sound Normal/CH Volume Control Normally
2.Applied to: LW9500, LW9600, andLW9800
3. Troubleshooting:
Check if Back Light is ON and, if it’s ON, re-check T-CON as the following sequence.
Change the Module if the voltage is normal. Change T-CON if voltage abnormal.
T-Con Board T-Con Board
Repair Method by Parts 9. Module Check(One Point Repair)
9. Wi-Fi Operating Checking(Flow Chart)
32
Wi-Fi operating error
Check the INSTART menu
Wi-Fi Mac value is “NG”?
Y
Check & Repair Wifi cable
connection
N Check the Wifi waferPin no.1
Change the Wifi assy
Y
Y
N ReplaceMain B/D
Wi-Fi Mac value is “NG”?
N
Close
PIN USB interface
1 Vcc(3.3V)2 DM3 DP4 GND5 WOW6 NC
Pin map
NormalVoltage
3.3V
Close
☞Page 34
Repair Method by Parts 10-1. Wi-Fi Check(Flow Chart)
33
1. Symptoms : Wi-Fi disconnection
2. Cause of failure : Caused by bad Wi-Fi Module
<Check Point> <Repiar method>
1. Check the Wi-Fi Version at INSTART menu - Wi-Fi MAC and IP Address to check an abnormal Inspection
1. Wi-Fi Module replacement2. Check the wi-fi Version at INSTART menu - Wi-Fi MAC and IP Address normal check connections from main to Wi-Fi module
Repair Method by Parts 10-2. Wi-Fi Check(One Point Repair)
10. Camera Operating Checking(Flow Chart)
34
Camera Operating Error
Check the INSTART menu
Camera Ver. is “NG”?
Y
Check & Repair Camera cable
connection
N Check the Camera waferP4200 (pin no.2)
Change the Camera assy
Y
Y
N ReplaceMain B/D
Camera Ver. is “NG”?
N Close
Close
CheckVoltage(3.3V)
Repair Method by Parts 11. Camera Check(Flow Chart/Troubleshooting)
35
Y
N
Check M-Remote
itself Operation
Y
Check & ReplaceBatterry of M-Remote
Press the ‘wheel’
N
N
N
Replace M4
Turn off/on the set
Press the ‘back’ and ‘home’ key at the same time
about 5secY
Check the INSTART menu
RF Receiver ver is “00.00”?
Y
N
Down load the Firmware
* INSTART MENU15.RF Remocon Test3. Firmware
download
Y
Check RF assy connection N
Close
Close
Close
NormalOperating?
NormalOperating?
Is it shown ‘ok’ message?
Is it shown ‘ok’ message?
Y
Press the wheel
☞Page 50
Close
Close
ReplaceRF assy Cable
Repair Method by Parts 12-1. Magic Remote Check(Flow Chart)
36
RF Pairing/Un-Pairing Method
Method Description
RF Pairing
1. Method 1 - If un-paired, just press "OK"button. - If paired, press "OK" button after un-pairing.2. Method 2(Repairing) - Press "BACK"button for 5 sec.
▶When pairing, the remote should make a pairing request IR signal to TV.▶When TV receive the IR signal, it should send “ pairing request packed" to the RF receiver.▶ After pairing success, the remote LED should blink for some time and TV sends "pairing success pack" back to TV.▶When remote try's to un-pair, it doesn't care about state of receiver(stand alone).
RF Un-Pairing
Depending on Magic remotePress "HOME/SMART" button and "BACK" button at the same time for 5sec.R/C LED blinks 3times after a few sec's.Then un-paired. To re-pair Press OK button.
▶When remote try's to un-pair, it doesn't care about state of receiver(stand alone).▶After un-pairing, all pairing information should be erased.▶After un-pairing, LED should blink 3times.▶The remote just becomes active only in IR mode control function.
Repair Method by Parts 12-2. Magic Remote Check(Pairing/Un Pairing)
37
‘13 models -Back/Smart keys
M4 Remote MR13P Remote
To Register Magic Remote
Press the Wheel(OK) button on the remote control
Pop-up message will appear on screen
When Registration completes, another pop-up message will appear.
To bring up cursor, simply move remote around.Maximum communication distance:10m or 32.8ft
Unregister Magic Remote Control
• Press the “Home” and “Back” on the remote fo 5 seconds• The Red LED at the top of the Remote will blink 3time• To re-register the Remote, follow first procedure
Repair Method by Parts 12-3. Magic Remote Check(Register/Unregister)
38
Y
N
Remote control(R/C) operating error
Check R/C itself Operation Operating
OK?
OperatingOK?
Y
Replace R/C
If R/C operate,Explain the customer cause is interferencefrom light in room.
Check R/C OperatingWhen turn off light
in room
Check & ReplaceBaterry of R/C
Check & RepairCable connectionConnector solder
OperatingOK?
Check B+ 3.5VOn Main B/D
☞Page 52~55
VoltageOK?
N
N
Check 3.5v on Power B/DReplace Power B/D or
Replace Main B/D(Power B/D don’t have problem)
Check IROutput signal
NormalSignal?
N
Y
Repair/ReplaceIR B/D
N
ReplaceMain B/D
Y
YClose
Close
☞Page 52~55☞Page 52~55
☞Page 10~12
Repair Method by Parts 13. Remote Control Check(Flow Chart)
39
1.2. Check IR cable condition between IR & Main board.3. Check the st-by 3.5V on the pin no.44. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog Tester
needle moves slowly, and defective when it does not move at all.
P41011 GND2 KEY13 KEY24 +3.5V_ST5 GND6 LOGO/LED_R7 IR8 GND
②
③
④
①
Main Board
Repair Method by Parts 13-2. Remote Control Check(Troubleshooting)
40
Checking order
1, 2. Check Motion cable condition between Motion assy & Main board.3. Check the 3.3V on the pin no. 1.
P48001 3.3V2 GND3 RX4 TX5 RESET6 DC7 DD8 GND
①
②
③
<LM Series>
Main Board
Repair Method by Parts 13-2. Remote Control Check(Troubleshooting)
41
P40021 GND2 KEY13 KEY24 +3.5V_ST5 GND6 LED7 +3.5V_ST8 GND
Checking order
1, 2. Check IR cable condition between IR & Main board.3. Check the st-by 3.5V on the pin no 4,7.4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
Tester needle moves slowly, and defective when it does not move at all.
①②
③
④
<LA Series>
Main Board
Repair Method by Parts 13-2. Remote Control Check(Troubleshooting)
42
Error symptom ContentVideo Error Color error
Adjustment Test pattern - ADJ Key
You can view 6 types of patterns using the ADJ Key
Checking item: 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR, SCAN BAR)4. Video error (Classification of MODULE or Main-
B/D!)
Adjustments method after Repair 16. Tool option setting method after main B/D change(adjustment RGB Pattern)
43
Step 1. Check full model name of your TV(Select one)a. Check a label on TV(Side or Rear)
b. Check menu(Non-Smart TV model) - Press(MENU) key on remot
- Press((Red) “Customer Support” key on remote - Select “Produce/Service Info” - Check “Model/Type”
b. Check SETUP(Smart TV model) - Press(Home) key on remot
- Select “SETUP” - Move to “SUPPORT” - Select “Product/Service info”
Step 2. Upgrade TV
- Check “Model/Type”
a. Make a folder “LG_DTV” on USB driveb. Save the software in “LG_DTV” folder. Make sure file is unzipped before placing in Folderc. Insert USB memory drive into USB port on TV
d. Select “Start” if “TV Software Upgrade” Pop-up appearse. Save the software in “LG_DTV” folder. Make sure file is unzipped before placing in Folderf. Insert USB memory drive into USB port on TV
If current software on TV is same with or newer thanThat on USB drive, TV software Upgrade menu won’t be opend(Some USB memory devices may not be compatible with TV)
Note)
Please wait while the update is copied to TV ※ Don’t remove USB drive while this message is displayed ※ Don’t unplug TV power cord while this message is displayed
Software upgrade in on progress ※ Don’t unplug TV power cord while this message is displayed
After the upgrade is completed, this message is displayedTV will restart automatically in 5 sec, than TV is ready to use
Adjustments method after Repair 17. Software Upgrad method with USB Memory
Course title LCD TV Repair Guide HandbookCategory
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Published on 04/01/2014
Developed by HE CS Technology Support Team
Published by Yongsu kim(e-mail: [email protected])
Updated on 11/02/2014
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