Electical Troubleshooting Guide - LG XB12 Service Manual

SECTION 3. ELECTRICAL

ELECTICAL TROUBLESHOOTING GUIDE

SMPS PART
No .5.6VA
YES
Is the F901
Normal?
YES
Is the BD901
Normal?
YES
Is the R901
Normal?
YES
Is Vcc
(9V - 18V) supplied
to IC911
Pin5?
YES
IS the D953
normal?
YES
Is there
about 2.5V at the
IC950 Pin1?
YES
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Only for training and service purposes
NO
Replace the F901.
(Use the same Fuse)
NO
Replace the BD901.
NO
Replace the R901.
NO
Is the D911 normal?
NO
Check or Replace the
D911.
NO
Replace the D953.
NO
Replace the IC950.
Is the PC901
normal?
YES
Is the D952
Normal?
YES
Is the D955
Normal?
YES
Power Line of Main
PCB is short.
- 3-1 -
NO
Replace the PC901.
NO
Replace the D952.
NO
Replace the D955.
LGE Internal Use Only