2. Backlight can’t be turned on
No raster?
Yes
LED orange?
Yes
Backlight can’t be turned on.
Yes
Is there 19V
No
voltage on pin23 of IC501,IC503
Yes |
|
Is there | No |
on pin1of IC501,IC503? |
|
Yes
Are CN511 and CN512 connected rightly?
Yes
No
Is Pin24 of IC501,IC503(VREF) 5V?
Yes
No
Is ok L501,L502?
Yes
Check adapter
Yes
Is R501 OK?
No
No
Is IC501,IC503 ok?
No
Check I/F board
R501open
Connecting the output connector again
IC501,IC503 fail
L501,L502 fail
Check feedback circuit
END