Sharp LC-15AV7U User Manual

7-2
A7121TS
1. POWER SUPPLY SECTION
Check IC601,D613,D614 and their periphery,
and service it if defective.
The power cannot be turned on.
The fuse blows out.
FLOW CHART NO.1
FLOW CHART NO.2
Is normal state restored when once unplugged
power cord is plugged again several seconds?
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,C610,
C611)
Ye s
No
Ye s
Is the fuse (F601) normal?
See FLOW CHART No.2 <The fuse blows out.>
No
Ye s
Is the AL +12V line voltage normal?
No
Check each rectifying circuit of the secondary
circuit and service it if de
fective.
Check the prese
nce that the primary component
is leaking or shorted and service it if defective.
Check the prese
nce that the rectifying diode or circuit
is shorted in each r
ectifying circuit of secondary side,
and service it if de
fective.
After servicing, replace the fus
e.
When the output voltage fluctuates.
FLOW CHART NO.3
Does the photocoupler circuit on
the
secondary side operate normally?
No
Ye s
Check IC601,Q913,D909,D933 and their periphery,
and service it if defective.
When buzz sound can be heard in the vicinity of power circuit.
FLOW CHART NO.4
Check if there is any short-circuit on the rectifying diode and the circuit
in each rectifying circuit of the secondar
y side,
and service it if defective. (IC901,IC90
4,IC905,IC906,D901,D902,D903,D906,D909,D911)
Check if there is
any leak or short-circuit on
the loaded circuit, and service it if def
ective.
+35V is not output.
FLOW CHART NO.5
Is approximately 35V voltage supplied to the
cathode of D909?
No
Ye s
Check D909, C907 and their periphery circuit, and
service it defective.

Sharp LC-15AV7U Specifications

General

Brand	Sharp
Model	LC-15AV7U
Category	TV
Language	English