Read Sharp LC-22SV2E (serv.man8) Service Manual online
23
LC-22SV2E
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is source GND
normal?
Is CSCOM
waveform
normal?
Check FB4901,
FB4902 and its
peripheral parts.
Check IC4702,
IC4701, Q4701
and their
peripheral parts.
Check FB4562
and its
peripheral parts.
Yes
No
No
Becomes
dark
No
Time passes,
becomes
dark
Is gate GND
normal?
Is gate clock
(GCK) normal?
Check FL4572,
R4582 and gate
aray peripheral
parts.
Yes
No
Check IC4568
and its
peripheral parts.
No
Is VEE-6V being
outputted?
Is VGH+34V
being
outputted?
Check IC4565
and its
peripheral parts.
Yes
No
Is GSP
waveform
normal?
Check R4578
and its
peripheral parts.
Yes
No
Becomes
white.
Is VSH+3.3V
being
outputted?
Is source clock
normal?
Check IC4713
and its
peripheral parts.
Check R4563,
IC4561 and
their peripheral
parts.
Check IC4907
and gate aray
peripheral parts.
Is output of LBR
normal?
Yes
Yes
No
No
No
Vertical line
output
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