Power - LG FH2 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE
2. NO POWER
Turn ON/OFF Switch on (ON).
Check voltage 11~15 V
in JACK4 pin5(AC/DC).
YES
Check voltage over 11 V
in JACK4 pin4(BATT).
Check L29(over 5 V).
Check L33(1.2 V), L34(3.3 V).
Check IC104 status.
Check Y2 crystal operation.
Check L341(133 MHz).
Press STANDBY(SW5) button,
check JACK2 pin4(0 V).
END
YES
YES
YES
YES
YES
YES
YES
YES
Check SMPS board.
1. Check connection Status on SMPS board CON1
and MAIN board JACK4.
NO
2. Check connection Status on SMPS board CON4
and MAIN board JACK8.
NO
1. Check SMPS board CN1 output.
2. Check Battery damage.
NO
NO
NO
NO
NO
Check IC103, IC105.
NO
Check SW5, JACK2.
3-12
NO
YES
Check IC11.
Check IC9.
Check IC104.
Check Y2.