Read Sharp LC-15A2E (serv.man2) Service Manual online
LC-15A2E
11
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC802 normal?
Is in/output of
IC1201 normal?
Check IC802
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check IC402
and its
peripheral parts.
Check IC802,
AV1 line and its
peripheral parts.
Check LCD
panel voltages
and waveform.
Yes
Yes
No
No
No picture
at all
Is in/output of
IC402 normal?
Is input at pin
73 of IC802
normal?
Yes
No
No
No TV and
VIDEO 1
output
Is voltages at
pin 3 of W7 and
pins 3, 4, 5 of
W14 tuner
normal?
Is output at pin
2 of W7 tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
3 of IC402
normal?
Is the pins 2
and 4 of IC402
at "H" and "L"
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pins 65
and 66 of
IC2001 at "H"
and "L" state?
Yes
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is input at pin
1 of IC402
normal?
Is the pins 2
and 4 of IC402
at "L" state?
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is the pins 65
and 66 of IC2001
at "L" state?
Yes
Yes
No
No
No
No VIDEO 1
output
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