Troubleshooting - LG 26LS3500 Service Manual

1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
ok
Check Micom Voltage
L404 : +3.5V
ok
Check X201 clock
24 MHz
ok
Check P403 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P403 2pin:24V ,17pin:12V
ok
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.1V
IC407 : 1.5V
Q403 : 3.3V
ok
Check LVDS Power Voltage
Q409 : 12V
ok
Check Mstar LVDS Output
ok
Check Inverter Control & Error Out
P403 18 pin : High
P403 24 pin : low
ok
Change Module
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Only for training and service purposes

TROUBLESHOOTING

No
Check Power connector
No
Replace L404
No
Replace X201
No
Re-download software.
No
Replace Power Board
No
Replace IC402/3/7, Q403
No
Replace Q409
No
Replace Mstar(IC101) or Main Board
No
Check Power Board or Module
ok
Main B/D 3.5V Line
Short Check
No
Replace Mstar(IC101) or Main board
- 13 -
ok
Replace Power board.
LGE Internal Use Only