Sharp LC-20B4M Service Manual download pdf (Page 19)

19

LC-20B4M

TROUBLE SHOOTING TABLE (Continued)

Check all the settings on the microprocessor

’s adjust process menu.

Are inputs

and outputs

of IC801 as

specified?

Does the DPS

test pattern

appear?

Does the

video decoder

test pattern

appear?

Check IC3401

and its

peripheral

parts.

Check

IC1201, its

peripheral

circuits and

the LCD

panel.

Check IC801

and its

peripheral

circuits.

Are inputs

and outputs

of IC3401 as

specified?

Check

IC3401 and

its peripheral

parts.

Is input at Pin

(73) of IC801

as specified?

Check IC801,

AV1 line and

their

peripheral

parts.

Are inputs and

outputs of

Q1602, Q1604

and Q1606 as

specified?

Check Q1602,

Q1604, Q1606

and its

peripheral

parts.

Is output at

pins (57)~(59)

of IC1601

normal?

Check the R,

G and B line.

Is input at

pin (21) of

IC1601

normal?

Check V2V0

line and its

peripheral

parts.

Check IC1601

and its

peripheral

parts.

Are inputs at

Pins (71) and

(72) of IC801

as specified?

Check

SC3405, SY

line, SC line

and peripheral

parts.

Is input at

Pins (4), (5),

(6) and (75)

of IC801 as

specified?

Check J3404,

DVD-Y line,

PB line, PR

line and

peripheral

parts.

Are voltages

at Pins (6),

(7) and (9) of

tuner as

specified?

Check the

power line.

Is output at

Pin (19) of

tuner as

specified?

Check the

tuner and its

peripheral

parts.

Is input at Pin

(16) of

IC3401 as

specified?

Check the

line in

question.

Check IC3401

and its

peripheral

parts.

Are Pins (3)

of IC3401 at

H?

Are Pins (48)

of IC2001 at

H?

Check the

line in

question.

No picture

No picture

at all

No VIDEO

1 or 2

output

No TELE

TEXT

output

No S

VIDEO

output

No

COMPONENT

output

No TV

output

Yes

No

Yes

No

No

No

Yes

No

No

Yes

Yes

No

No

Yes

No

No

Yes

No

Yes

No

No

Yes

Yes

No

Yes

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