Troubleshooting Guide - LG 43LX340H Service Manual

1. Power-up boot check
Check stand-by Voltage.
P401 5, 6pin : + 13.2V
ok
Check stand-by Voltage
L403 : + 13. 2V
ok
Check X101 clock
24 MHz
ok
Check P401 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P401 7, 8pin : A13.2V
ok
Check IC405, IC404, IC400, Q406
Output Voltage
IC405 : 3.5V
IC404 : 1.5V
IC400 : 1.1V & 5V
Q406 : 3.3V
ok
Check LVDS Pow er Voltage
Q405 : 13.2V
ok
Check Mstar LVDS Output
ok
Check DRV ON Control
P401 11 pin : High
ok
Change Module
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Only for training and service purposes
TROUBLE SHOOTING
No
Check 12pin Pow er connector
No
Replace L403
No
Replace X101
No
Re-dow nload software.
No
Replace Power Board
No
Replace IC405, IC404, IC400, Q406
No
Replace Q405
No
Replace Mstar(IC101) or Main Board
No
Check Pow er Board
ok
Main B/ D 13.2V Line
Short Check
No
Replace Mstar(IC101) or Main board
- 10 -
ok
Replace Power board.
LGE Internal Use Only