LG 42LD465 Service Manual page 45

1. Power-up boot check
Check stand-by Voltage.
P403 or P404 9~12pin : +3.5V_ST
ok
Check Micom Voltage
IC1002 pin 48 : +3.5V
ok
Check X1002 clock
32 KHz
ok
Check P403 or P404 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P403 2 pin : 20V, 17 pin : 12V
P404 2 pin : *20V, 17 pin : 12V
ok
Check IC402/3/5/7 Output Voltage
IC402 : 2.5V
IC403 : 1.26V
IC405 : 3.3V
IC407 : 1.5V
ok
Check X201 Clock
24 MHz
ok
Check LVDS Power Voltage
Q409 : 12V
ok
Check Mstar LVDS Output
ok
Check Inverter Control & Error Out
P403 or P404 18 pin : High
P403 or P404 24 pin : Low
ok
Change Module
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Only for training and service purposes
No
Check Power connector
-. P403 : 37inch / 42inch Model
-. P404 : 26inch / 32inch Model
No
Replace L404
No
Replace X1002
No
Re-download Micom software.
No
Replace Power Board
No
Replace IC402/ 3 / 5 / 7
No
Replace X201
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 Micom(IC1002) or Main board
*20V Voltage is dependent on Model
26LD350 => 24V
ok
Replace Power board.
LGE Internal Use Only