Trouble Shooting - LG 39LY340H Service Manual

1. Power-up boot check
Check stand-by Voltage.
P401 3, 5pin : +3.5V_ST
ok
Check stand-by Voltage
L400, L401 : +3.5V
ok
Check X101 clock
24 MHz
ok
Check P401 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P401 9, 10pin : 24V
/ 13, 14, 15pin:12V
ok
Check IC403/404/Q406
Output Voltage
IC403 : 1.1V
IC404 : 1.5V
Q406 : 3.3V
ok
Check LVDS Power Voltage
Q405 : 12V
ok
Check Mstar LVDS Output
ok
Check DRV ON Control
P401 2 pin : High
ok
Change Module
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Only for training and service purposes

TROUBLE SHOOTING

No
Check 18pin Power connector
No
Replace L400, L401
No
Replace X101
No
Re-download software.
No
Replace Power Board
No
Replace IC403, IC404, Q406
No
Replace Q405
No
Replace Mstar(IC101) or Main Board
No
Check Power Board
- 15 -
ok ok
Main B/D 3.5V Line
Short Check
No
Replace Mstar(IC101) or Main board
Replace Power board.
LGE Internal Use Only