Sharp LC-20S2U Service Manual download pdf (Page 43)

LC-20S2U-S

43

TROUBLE SHOOTING TABLE (Continued)

Check all the settings on the microprocessor s adjust process menu.

No picture

No picture

at all

Yes

No

Check

IC1201, its

peripheral

circuits and

the LCD

panel.

Check IC801

and its

peripheral

circuits.

Yes

No

No

No VIDEO

1 or 2

output

Yes

No

Are input and

output of

IC3401, IC3402

as specified?

Check IC3401,

IC3402 and its

peripheral

parts.

No

Are inputs at

Pins (116)

and (118) of

IC801

Check IC801,

V1_V line and

their

peripheral

parts.

Yes

No

Are input and

output of

IC8201 as

specified?

Check IC802,

IC803 and its

peripheral

parts.

Yes

No

Are inputs and

outputs of

IC802, IC803

as specified?

No

Check pin

(48), (47)

and (54) of

IC2001.

No S

VIDEO 1 or

2 output

Yes

Yes

Yes

Yes

Are input and

output of

IC3402 and

IC3401 as

specified?

No

No

No

Check SC3411,

SC3412, SY

line, SC line

and peripheral

parts.

No

COMPONENT

output

No

Are inputs at

pins (108),

(116) and (118)

of IC801 as

specified?

Check J3404,

Y-I, Pb-I, Pr-I

and

peripheral

parts.

No TV

output

Yes

No

Are voltages

at Pins (6),

(7) and (9) of

tuner as

specified?

Check the

power line.

Yes

No

Is output at

Pin (19) of

tuner as

specified?

Check the

tuner and

its

peripheral

No

Is input at Pin

(5) of

IC3402

as specified?

Check the

line in

question.

No

Yes

No

Is Pin (4) of

IC3402

at H?

Is Pin (48)

IC2001 at

H ?

Yes

Check the

line in

question.

Check pins

(51), (88) of

IC2001 or

the SSW,

SSW2 line.

Are inputs

and outputs

of IC801 as

specified?

Does the LCD

controller test

pattern

appear?

Does the

video decoder

test pattern

appear?

No

Are inputs at

Pins (131),

(132) and (133)

of IC1201 as

specified?

No

No

Check P1201

YP line, Pb-P,

Pr-P line and

peripheral

parts.

Check C815

Check J3404, Y-P, Pb-P, Pr-P

and peripheral parts.

Check

QCNW-

B535WJZZ

Is input at Pin

(6) of IC804 as

specified?

Is an error

message

displayed?

Is the

progressive

input

coming?

Out-of-support

message "Yes"

Check

IC3402 and

its peripheral

parts.

Check

IC3402 and

its peripheral

parts.

Are inputs at

Pins (116) and

(118) of IC801

as specified?

Check IC8201,

and its

peripheral

parts.

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