LG L1804R - Manual (Page 25)

Service Manual 25
Troubleshooting Guide
• Check the Fuse.
• Check the wiring diagram.
Is the
Trans input power AC 115V?
(208/230V for LWL1230WAL)
Is the Trans output power
about AC 14V?
Is shorted the Trans. output?
Is output Voltage of IC01D
DC 12V?
Is output Voltage of IC02D
DC 5V?
Is the voltage No.18 of Micom
DC 5V?
Replace AC PCB Ass'y.
Is the
connection between
AC and DC
OK?
Is the reset circuit OK?
(The No.14 of
Micom is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the Main
PCB pattern.
• Replace the Trans.
• Replace D02D~D05D.
• Replace IC01D.
• Replace IC02D.
• Replace IC01A, C02A.
• Connect connector
exactly.
• Check the PCB
pattern.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
Possible Trouble 1 The unit does not operate.
Electrical Parts Troubleshooting Guide