Trouble Shooting - No Power - LG 55G2 Service Manual

1. Trouble shooting - No power

Check stand-by Voltage.
P2301 9~12pin : +3.5V_ST
ok
Check Micom Voltage
IC3000 48 pin : +3.5V
ok
Check X3000 clock
32.768 KHz
ok
Check P2301 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P2301 2~4 pin : 24V , 17,19,21 pin : 12V
ok
Check IC2300/1/2/3/4/5/6 Output Voltage
IC2300 : 1.8V, IC2301 : 3.3V
IC2302 : 1.5V, IC2303 : 2.5V
IC2304 : 5V, IC2305 : 0.9V, IC2306 : 1V
ok
Check X101 Clock
24 MHz
ok
Check LVDS Power Voltage
Q2305 : 12V
ok
Check Inverter Control
P2301 18 pin : High
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Only for training and service purposes
No
Check Power connector
No
Replace L2303
No
Replace X3000
No
Re-download Micom software.
No
Replace Power Board
No
Replace 2300/1/2/3/4/5/6
No
Replace X101
No
Replace Q2305
No
Check Power Board or Module
Main B/D 3.5V Line
ok
Short Check
No
Replace Micom(IC3000) or Main board
ok
Replace Power board.
LGE Internal Use Only