Electrical Troubleshooting Guide; Power Supply On Smps Board - LG LAB550H Service Manual
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Also See for LAB550H:
- Simple manual (2 pages) ,
- Owner's manual (2 pages) ,
- Owner's manual (75 pages)
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ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD
No 22.2 VA
Is the F900 normal?
Is TH900 normal?
Is BD900 normal?
Is the VCC
(12 V) supplied to IC901
pin4?
Power line of MAIN board is short.
YES
YES
YES
YES
YES
NO
Replace F900 (same fuse).
NO
NO
NO
Is D921 normal?
Check or replace D921.
2-41
Replace TH900.
Replace BD900.
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