Sharp LC-20B4M Service Manual download pdf (Page 18)

18

LC-20B4M

TROUBLE SHOOTING TABLE

No or Wrong

Picture

Does the IC801

test pattern appear

properly?

Does the IC1201 test

pattern appear

properly?

Check the IC801 signal

output line, IC801 itself

and its peripheral

circuits.

Are the waveforms at

pins (8), (9), (26), and

(27) of IC1201

as specified?

Check IC1201 and its

peripheral circuits as

well as the LCD panel

voltage and waveform.

Check the related lines,

IC801 itself and its

peripheral circuits.

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)

Check the IC801 signal

input line.

Check IC801 and its

peripheral circuits.

No

No

No

No

Yes

Yes

Yes

Yes

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