Acer LCD-S243HL User Manual download pdf (Page 54)

2. Backlight can’t be turned on

No raster?

LED

orange

?

Yes

Yes

Yes

Backlight can’t

be turned on.

No

Check adapter

Is there high-level voltage

on pin

1

of IC501

,IC503?

No

Is R5

0

1 OK?

Check I/F

board

Yes

R501open

No

Yes

Is Pin24 of IC501,IC503(VREF) 5V?

No

Is IC501,IC503 ok?

No

IC501,IC503 fail

Yes

Is ok L501,L502?

L501,L502 fail

Are CN511 and CN512

connected rightly?

No

Connecting the

output connector

again

No

Check feedback circuit

Yes

END

Is there 19V

voltage on pin23

of IC501,IC503

Yes

Yes

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