[SOLVED]820-2530 white screen

[Gmorb]

So i have a macbook which only boots up to a white screen, tried smc, nvram, pram reset and swapped ram all i get is a white screen cannot boot to recovery mode no apple logo. What could be the issue where should i start? Bad smc?

 

[dukefawks]

No 3V to LCD. Check L9004 and voltage there.

 

[Gmorb]

No voltage on l9004

upon further inspection noticed a tiny bit of corrosion on the board. Ran it through ultrasonics and mac is working again.