Macbook 820-02935 No Backlight

[Instafixx]

Device came in with no backlight. Some corrosion under UP800. Cleaned and reballed the same ic and it started working.
it worked for 10 days but again backlight gone. I replaced the ic but when I am replacing the ic the bird gets stuck at 5v. the ic is fine as installed that chip on another machine with no backlight issue and it is working.

What can be the issue here ?

 

[Instafixx]

I think since we used the old IC. PPLUXE_LX1 is shorted. I suspect bad QP800/2.

Where do I find these mosfets. Will chips from M1 air and pro A2337/8 work ?

 

[2informaticos]

You can remove the MOSFETs and test them out of board.
Any backlight MOSFET with same layout should serve; all these LCDs have the same backlight voltage.

Remove them one by one and check if short disappear.
There may be a bad filter cap instead.

 

[Instafixx]

Bad Mosfets. Replaced. Device works now.