LG LWC101GGMK1 Service Manual page 22

ELECTRICAL PARTS TROUBLESHOOTING GUIDE
Possible Trouble 1
Is the Trans input power
the same as specified?
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 PCB Ass'y.
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Only for training and service purposes
The unit does not operate.
NO
NO
Is shorted the Trans. output?
NO
NO
NO
NO
NO
- 22 -
NO
YES
• Check the Fuse.
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
• Check the Main
PCB pattern.
• Exchange the Trans.
• Exchange D02D~D05D.
• Exchange IC01D.
• Exchange IC02D.
• Exchange IC01A, C02A.
• Connect connector
exactly.
• Check the PCB
pattern.
LGE Internal Use Only