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42LH260H (CHASSIS:LA96B) - LG TV Service Manual (repair manual). Page 17

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- 17 -
TROUBLESHOOTING
1. Power-up boot check
Check stand-by Voltage.
P700 8pin : +5V_ST
Check X100 clock
Check Power connector
and AC S/W on?
OK
No
OK
Check Q706 Output.
12V, 5V
Replace Power board.
Replace X100.
OK
Check Fuse.
OK
No
Check P700 PWR_ON.
2pin : 5V
OK
Re-download software.
No
OK
Check Multi Voltage
P700 13pin : 12V, 18pin : 24V
Replace Power board
No
Replace Mstar(IC100) or Main board
OK
Replace Q706
No
Check inverter control & error
P700 22pin : Low
P700 20pin : high
OK
Check Power board or Module
No
Check Mstar LVDS output
R812, R813,..., R821
Replace Mstar(IC100) or Main board
No
OK
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