Troubleshooting - Sylvania LC427SSX Service Manual

[ Power Supply Section ]
( Inverter Power CBA )
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse (F1601) normal?
Is the AL+5V line voltage normal?
FLOW CHART NO.2
The fuse blows out.
FLOW CHART NO.3
When the output voltage fluctuates.
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of power circuit.

TROUBLESHOOTING

Yes
Yes
Yes
Yes
Yes
No
See FLOW CHART No.2 <The fuse blows out.>
No
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(D1205, D1206, D1207, D1208, Q1203, Q1204,
No
T1201)
No
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(D1601, IC1401, IC1702, Q1601, Q1602, Q1701,
Q1702, T1701)
No
Check D1213, D1720, IC1202, IC1704 and their
periphery circuit, and service it if defective.
8-1 A91H1TR