Read Sharp LC-20B2EA Service Manual online
14
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No picture (1/3)
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC801 normal?
Is in/output of
IC1201 normal?
Check IC801
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check IC402
and its
peripheral parts.
Check IC801,
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 IC801
normal?
Yes
No
No
No TV and
S-Video
output
Is voltages at
pins (6), (7) and
(18) of tuner
normal?
Is output at pin
(13) of tuner
normal?
Check their
power line.
Check tuner
and its
peripheral parts.
Is input at pin
(3) of tuner
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
(75) of IC801
normal?
Check V1 IN
line and its
peripheral parts.
No
No
No VIDEO 2
output
Check the SY-line,
SC-line and their
peripheral parts.
Is input at pin (1)
of IC402 and pin
(71) of IC801
normal?
No S-VIDEO
output
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