Read Sharp LC-20M4E (serv.man3) Service Manual online
LC-20M4E
14
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Check all the settings microprocessor's adjust process menu.
Is source GND
normal?
Is CSCOM
waveform
normal?
Check R1212
and its
peripheral parts.
Check IC1109,
Q1101, Q1102,
D1101, R1120,
R1130 and their
peripheral parts.
Check R1231
and its
peripheral parts.
Yes
No
No
Becomes
dark
No
Time passes,
becomes
dark
Is gate GND
normal?
Is gate clock
(GCK) normal?
Is output at pin
(3) of IC1205
normal?
Yes
No
Check D1201
and its
peripheral parts.
No
Is B-5.5V being
outputted?
Is VCC being
outputted?
Check T701's
secondary +5V
outputs line.
Yes
No
Is GSP
waveform
normal?
Check R1223
and its
peripheral parts.
Yes
No
Check R1223
and gate aray
peripheral parts.
Becomes
white.
Is 3.3V VSH
being
outputted?
Is source clock
(CK) normal?
Check +3.3V
outputs line of
IC781.
Check R1210,
R1211 and their
peripheral parts.
Check FB1203
and gate aray
peripheral parts.
Is output of
LBR and HG
normal?
Yes
Yes
No
No
No
Vertical line
output
TROUBLE SHOOTING TABLE
(Continued)
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