LG LWJ0515PCW Svc Manual page 20

ELECTRIC PARTS TROUBLESHOOTING GUIDE:
Possible Trouble 1
Is the Trans output power
AC 115V?
YES
Is the Trans output power
about AC 14V?
YES
Is output Voltage of IC01D
DC 12V?
YES
Is output Voltage of IC02D
DC 5V?
YES
Is the reset circuit all right?
(The No.14 of Micom
is 5V.)
YES
Is the
connection between
Main and Display
all right?
YES
Is the voltage No.18 of Micom
DC 5V?
YES
Exchange Main P.W.B Ass'y.
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Only for training and service purposes
• The unit does not operate.
NO
NO
Is shorted the Trans. output?
YES
NO
NO
NO
NO
NO
- 20 -
• Check the Fuse.
• Check the wiring diagram.
NO
• Check the Main
P.W.B pattern.
• Exchange the Trans.
Exchange D02D~D05D.
•
• Exchange IC01D.
• Exchange IC02D.
• Exchange IC01A.
• Connect connector
exactly.
• Check the P.W.B
pattern.
LGE Internal Use Only