Electrical Troubleshooting Guide; Smps Part Check - LG HB954WA Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS PART CHECK

No power
Check the AC
line pattern
YES
Check the F901 fuse
YES
Check the C968
volt(3.9V)
YES
Check the IC911
Vcc volt (14~18V)
YES
Change the SMPS assy
No sound
Check the IC912
Vcc volt (12~16V)
YES
Check the C950 volt
(35 or 32V)
YES
Change the IC912 or
the SMPS assy
NO
Connect the open line
NO
Replace the fuse
Check a BD901 "+"
to "-" pin impedance
NO
Check a SMPS second part lines short
Check a main or AMP assy short
NO
Replace PC901, IC960 all
Check around IC911's components
(Short, Open)
NO
Check no power list, AC input voltage
NO
Check the AMP module short
Replace PC903, IC950 all
2-30
Low impedance
change IC911, BD901