Sharp LC-10A3U Service Manual download pdf (Page 16)

16

LC-10A3U

SUPPLEMENT

TROUBLE SHOOTING TABLE (Continued)

No picture and sound

No color

No TV color

No S-VIDEO color

Yes

No

Do F3701 and F3702

function?

Check all the settings on the microprocessor

’s adjust process menu.

No

Are secondary outputs

(+38V, +16V, +9V, +5V, -8V)

of T701 as specified?

Yes

Are the oscillation waveform

at T701’s primary side as

specified?

Yes

No

Disconnect F3701 and

F3702. Is the load side

short-circuited?

Yes

No

Is any of T701’s primary side,

Q701, Q710 and S4701

short-circuited?

Check J3701, its peripheral

parts and connection cable.

Replace F3701 and F3702.

Check S4701 and

connection cable.

Check the secondary-side

load of T701.

Fluorescent lamp failure

Yes

No

Does F3751 function?

Yes

No

Is Pin (34) of IC1201 at

“H”?

Yes

No

Are the oscillation waveforms

at the primary side of T751

and T752 as specified?

Yes

Replace F3751.

No

Is input at Pin (71) of IC802

as specified?

Check J3301, SC line and

peripheral parts.

Yes

Check the line, IC1201 and

its peripheral parts.

Check Q751, Q752, T751,

T752, Q753 and their

peripheral parts.

Replace the fluorescent lamp

and check the oscillation

waveform again.

No VIDEO color

Check all the settings on the microprocessor

’s adjust process menu.

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