820 00840 no video

[LetsFix]

the macbook turns on , fan spins, click on keyboard, cpu gets hot. but i dont have any video on display. where do i start to to check?.

 

[2informaticos]

First confirm USB activity.
Also check for external video.
Any history, liquid damage?

 

[LetsFix]

already tested for usb activity, a connected mouse, blinks once and thats all. ill check for external video. no idea what happened, but i can see some green stuff at wifi controller.

 

[LetsFix]

well ive checked for external video and nothing. so no usb activity. it seems water damaged, corrosion at backlight caps and tripped water seals. ive cleaned the corrosion but the issue persist: cpu gets hot, fan spin, and nothing more...

 

[LetsFix]

got it, ill try that...else this is a piece of crap then?