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1. Power-up boot check
Check stand-by Voltage.
P700 8pin : +5V_ST
OK
Check X100 clock
12MHz
OK
Check P700 PWR_ON.
2pin : 5V
OK
Check Q706 output level
5V
OK
Check Multi Voltage.
P700 13pin : 12V, 18pin : *20V
OK
Check inverter control & error
P700 22pin : Low
P700 20pin : high
OK
Check IC704 output voltage
3.3V
OK
Check Mstar LVDS output
R812, R813,..., R821
Copyright
LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING
No
Check Power connector.
and AC S/W on?
No
Replace X100.
No
Re-download software.
No
Replace Q706
No
Replace Power board.
No
Check Power board or Module.
No
Replace IC704.
No
Replace Mstar(IC100) or Main board.
- 16 -
OK
OK
Check Fuse.
OK
Replace Mstar(IC100) or Main board
*20V Voltage is dependent on model.
32/36LH20, 32LH30 => 24V
19/22LH20 => 15V(pin1 or 2)
Replace Power board.
LGE Internal Use Only
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