LG LAS350B Service Manual page 22

ELECTRICAL TROUBLESHOOTING GUIDE
FRONT CIRCUIT
1
Check
if the power part of the front
is ok?
Check if CON303 is ok?
Check if R306~R309 ok?
Refer to MICOM circuit.
2
Check
if thepower part of the front
is ok?
Check if the remote
control waveform of CON301
pin3 is ok?
Check if REM
voltage is ok(3.3 V)?
Resolder or Replace IR301.
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Refer to power(SMPS).
Replace R306~R309.
Refer to power(SMPS).
Refer to MICOM circuit.
3-9
Reconnect it.
Check REM circuit