iMac 27" 2011 - no backlight - turns on for 1 second on boot

[quasimodo]

Hey,

any idea for this problem?

iMac 27" 2011 Backlight not working.

Graphics good, iMac boots, externally fully functional.


The backlight turn on for 1 second when i press the power button - then shuts off.

LED driver board is replaced. Same problem.



Any ideas?

 

[2informaticos]

Can you post 820-xxxx code of your board?
Any history fault available?

Confirm if image is present, only missing backlight.

 

[quasimodo]

dont know the 820 code..

27" 2011

machine of a strong smoker...

image is present - only backlight is missing. backlight turns on for 1 second on boot, then shuts off..

 

[2informaticos]

It should be 820-2828, but you should post correct code when open new thread!

Check VIDEO_ON and BL_EN, with LCD connected.