Electronic Parts Troubleshooting Guide - LG LV-B3620CL Service Manual

Electronic Parts Troubleshooting Guide

Possible Trouble 1
Is the input voltage
of transformer AC220V?
YES
Is the output voltage
of transformer about AC14V?
YES
Is the input voltage
of IC01D DC14V?
YES
Is the output voltage
of IC01D DC12V?
YES
Is the output voltage
of IC02D DC5V?
YES
Is the PIN 29 of
Micom DC5V?
YES
Is the PIN 55,64 of
Micom DC5V?
YES
Exchange Micom
: The unit does not operate.
NO
NO
transformer output?
NO
NO
NO
NO
NO
Is shorted the
NO
YES
–45–
Check the FUSE
and the wiring diagram
Check the RY-COMP PIN 3
and CN-4WAY PIN 1
Check the main P.C.B
pattern
Exchange
the transformer
Exchange D01D-D05D
Exchange IC01D
Exchange IC02D
Exchange IC01A
Check the 5V P.C.B
pattern