DOWNLOAD LG 55LK520 (CHASSIS:LA01U) Service Manual ↓ Size: 4.8 MB | Pages: 64 in PDF or view online for FREE

Model
55LK520 (CHASSIS:LA01U)
Pages
64
Size
4.8 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55lk520-chassis-la01u.pdf
Date
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Trouble shooting guide
1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
Check Power connector
Main B/D 3.5V Line
Short Check
Check X1002 clock
32 KHz
Replace X1002
Check P403 PWR_ON.
1pin : 3.3V
Replace Micom(IC1002) or Main board
Check Multi Voltage
P403 2pin:
20V
or 24V ,17pin:12V
Replace Power Board
Check Inverter Control & Error Out 
P403 18 pin : High
P403 24 pin : low
Check Power Board or Module
Check IC402/3/5/
6
/7/
10 
Out Voltage
IC402 : 2.5V
IC403 : 1.26V
IC405 : 3.3V
IC406 : 6V
IC407 : 1.5V
IC410 : 5V
Replace 
IC402/3/5/6/7/10
Re-download Micom software.
Check Micom Voltage
IC1002 pin 48 : +3.5V
Replace L404
Check LVDS Power Voltage
Q409 : 12V
Replace Q409
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
No
No
No
No
No
No
No
No
Replace X201
ok
No
Replace Power board.
ok
Check X201 Clock
24 MHz
※ When the PCB is EAX63529602
IC406 : 5V
IC410 : N/A
Trouble shooting guide
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.2V Power 
IC3703  2 pin : 1.2V
Check IF_P/N Signal
TU3702 17/18 Pin
Replace IC3703 
Check Tuner 5V Power
L3702
Check 
IC411
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
No
Replace 
IC411
No
Bad Tuner. Replace Tuner.
Replace L3702
ok
※ When the PCB is EAX63529602
IC411 is not available.           
In this case, check IC406 is 5V or not
Trouble shooting guide
3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.2V Power 
IC3703 2 pin : 1.2V
Check CVBS Signal
TU3702 11 Pin
Replace IC3703 .
Check Tuner 5V Power
L3702
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Check 
IC411
No
Replace 
IC411
No
Replace L3702
ok
※ When the PCB is EAX63529602
IC411 is not available.           
In this case, check IC406 is 5V or not
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