Electronic Parts Troubleshooting Guide - LG LS-B0760CM/B0760HM Service Manual

Electronic Parts Troubleshooting Guide

Possible Trouble 1
Is the trans input power
AC240V?
YES
Is the trans
output power about
AC15V?
YES
Is input voltage of IC2
DC16V?
YES
Is output voltage of IC2
DC12V?
YES
Is output voltage of IC3
DC5V?
YES
Is the reset circuit all
right?
YES
Is output voltage of
IC1 PIN3.51 DC5V
YES
Exchange IC1.
: The unit does not operate.
NO
NO
Is shorted the
trans output?
NO
NO
NO
NO
NO
- 52 -
NO
YES
Check the fuse check
the wiring diagram.
Check the main
P.C.B pattern.
Exchange the trans.
Exchange BD01.
Exchange IC2.
Exchange IC3.
Check and exchange IC4
Check the DC 5V
P.C.B pattern