Read Sharp LC-20M4E (serv.man3) Service Manual online
13
LC-20M4E
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
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 voltage
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 VIDEO 1
and VIDEO 2
output
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
No
No
Yes
Yes
No VIDEO 1
output
Is input at pin
(5) of IC402
normal?
Is the pin (4) of
IC402 in the
"H" state?
Check the its
line.
Check the its
line.
Yes
Yes
No
No
No VIDEO 2
output
Check IC402
and its
peripheral parts.
Is input at pins
(71) and (72) of
IC801 normal?
No S-VIDEO
output
Check the
SC401, SY-line,
SC-line and their
peripheral parts.
Is the pin (68)
of IC2001 in the
"H" state?
No
Click on the first or last page to see other LC-20M4E (serv.man3) service manuals if exist.