Flow Chart No.1; The Power Cannot Be Turned On; The Fuse Blows Out; When The Output Voltage Fluctuates - Sharp LC-15AV1U Service Manual

1. POWER SUPPLY SECTION

FLOW CHART NO.1

The power cannot be turned on.

Is the fuse (F601) normal?
Is the AL +3.3V 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.

FLOW CHART NO.5

AL-8V is not outputted.

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.
(Q601,Q603.T601,D605,D606,D607,D608,C605,
No C606,C610,C654)
No
Check IC601,D646,D649 and their periphery, and
service it if defective.
No
Check D631 and the periphery circuit, and service
it if defective.
6-2
L0370TS