Troubleshooting Guide - LG PFM42V1 Service Manual

TROUBLESHOOTING GUIDE(MAIN)
NO POWER
Check 5V-ST
CN9(Pin#3)
Pass
Check Ctrl signal
CN9 (Pin#2)
'RLY'
Pass
Check Ctrl signal
CN9 Pin#1
'ACD'
Pass
Check Ctrl signal
CN9 (Pin#5)
'VS07'
Pass
*Check the Power
Cable connection
1. OUT OF ORDER ON POWER
Check
Fail
Connector or
5V-ST Output
On Power B'd
Pass
Fail
Check
IC8 (Pin #6)
Pass
Fail
Check
IC2 (Pin #3)
Pass
Fail
Check
IC8 (Pin #9)
Pass
- 13 -
Fail
Replace
the Power B'd
High
Check Device
Q35, IC8, IC3
Connector or 'ACD'
High
Output On Power B'd
Check Device
IC2, IC3
High
Check Device
Q36, IC8, IC3