Trouble Shooting Table - Sharp LC-20S1M Service Manual

LC-20S1M

TROUBLE SHOOTING TABLE

No or Wrong
Picture
Does the IC801
No
test pattern appear
properly?
Yes
Does the IC1201 test
pattern appear
properly?
Yes
Check the IC801 signal
output line, IC801 itself
and its peripheral
circuits.
Check IC1201 and its
peripheral circuits as
well as the LCD panel
voltage and waveform.
Are the waveforms at the signal
input pins of IC801 as specified?
TV/Composite Pin (73)
S Video Pins (72) and (73)
Component Pins (1), (2), (3)
and (75)
Yes
Check the IC801 signal
input line.
Check IC801 and its
peripheral circuits.
No
Are the waveforms at
pins (8), (9), (26) and
(27) of IC1201
as specified?
Yes No
Check the related lines,
IC801 itself and its
peripheral circuits.
No
18