LG LW1200PR Service Manual page 22

ELECTRICAL PARTS TROUBLESHOOTING GUIDE: LW1200PR
Possible Trouble 1
Is the
Trans input power AC 115V?
(208/230V for LWL1230WAL)
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
AC and DC
all right?
YES
Is the voltage No.18 of Micom
DC 5V?
YES
Exchange AC PCB Ass'y.
The unit does not operate.
NO
NO
Is shorted the Trans. output?
NO
NO
NO
NO
NO
YES
—22—
• Check the Fuse.
• Check the Fuse.
• Check the wiring diagram.
• Check the wiring diagram.
NO
• 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.