Troubleshooting - LG 37LH250H Service Manual

1. Power-up boot check
Check stand-by Voltage.
P700 8pin : +5V_ST
OK
Check X100 clock
OK
Check P700 PWR_ON.
2pin : 5V
OK
Check Multi Voltage
P700 13pin : 12V, 18pin : 24V
OK
Check Q706 Output.
12V, 5V
OK
Check inverter control & error
P700 22pin : Low
P700 20pin : high
OK
Check Mstar LVDS output
R812, R813,..., R821
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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 Power board
No
Replace Q706
No
Check Power board or Module
No
Replace Mstar(IC100) or Main board
- 17 -
OK OK
Check Fuse.
OK
Replace Mstar(IC100) or Main board
Replace Power board.
LGE Internal Use Only