Internal display not working (not showing anything but backlight work)

I suspect video display cable damage or defect 0r HD in the one with no display. Are you swapping inverter boards? Bring the bad to the good, vice versa.. any change in the working machine would verify the source.

Try swapping HDs or booting the problem machine from some other source to verify/eliminate.

It might be the GPU but generally when they fail there's no external video.

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2 Comments:

Dear machead3,

As i wrote in details at apple discussion, please check link http://goo.gl/d8hFb1.

I have replaced display, also display from this laptop is working fine at similar laptop and display from working laptop showing same issue at first laptop. There is no any problems with HD. Also i did NVRAM reset, it not helped me.

Maybe you mean some other inverter that is not inside of monitor?

Mar 20, 2014 by vangol

Nope - that's the one. Some things are beyond A DIY repair. About all you can do at this point is replace the logic board… or while it's out send it off someplace that can perform a test… there's probably a bad component on the logic board - what that is I couldn't guess.

Mar 20, 2014 by originalmachead

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Dear machead3,

As i wrote in details at apple discussion, please check link http://goo.gl/d8hFb1.

I have replaced display, also display from this laptop is working fine at similar laptop and display from working laptop showing same issue at first laptop. There is no any problems with HD. Also i did NVRAM reset, it not helped me.

Maybe you mean some other inverter that is not inside of monitor? — vangol
Nope - that's the one. Some things are beyond A DIY repair. About all you can do at this point is replace the logic board… or while it's out send it off someplace that can perform a test… there's probably a bad component on the logic board - what that is I couldn't guess. — originalmachead