Read Sharp LC-22SV2E (serv.man8) Service Manual online
21
LC-22SV2E
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC801 normal?
Is in/output of
IC4101 normal?
Check IC801
and its
peripheral parts.
Check IC4101
and its
peripheral parts.
Check IC3402
and its
peripheral parts.
Check IC801,
AV1 line and its
peripheral parts.
Is in/out of
IC4561 normal?
Yes
Yes
No
No
No picture
at all
Check IC4561
and its
peripheral parts.
No
Check LCD
panel voltages
and waveform.
Yes
Is in/output of
IC3402 normal?
Is input at pin
(73) of IC801
normal?
Yes
No
No
No TV and
VIDEO 2
output
Is voltages at
pins (6), (7)
and (18) of
W14
tuner normal?
Is output at pin
(13) of tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
(3) of IC3402
normal?
Is the pins (2)
and (4) of
IC3402 at "H"
and "L" state?
Yes
Yes
No
No
Yes
No
Yes
No TV output
Check the pins
(65) and (66) of
IC2001 at "H"
and "L" state.
No
Check the its
line.
Check IC3402
and its
peripheral parts.
Is input at pin
(1) of IC3402
normal?
Is the pins (2)
and (4) of
IC3402 at "L"
state?
Check the its
line.
Check IC3402
and its
peripheral parts.
Check the pins
(65) and (66) of
IC2001 at "L"
state.
Yes
No
No
Yes
No VIDEO 2
output
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