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820-00840 backlight but no picture

I

ielectron

Member
I dont have the schematics and boardview for this, can please someone send it to me?

It had a light water damage, around the wifi area and the lcd connector, i cleaned it and it powers on but there is only backlight no picture.

The water damage was pretty small area.

I got a usb-c hdmi adapter and there is picture on the tv, though it wont boot to osx but the emergency? menu, where it say it could not boot, maybe i forget my password.... anyway i think that part is just osx reinstall, the trackpad and keyboard works and i can connect to the wifi (in that limited menu, maybe i will try to boot from usb enclosure later). so the only issue is the that is no picture on the screen. I suspect it needs new lcd, but what can i check before i order it? (lcd connector had bit water on it, i cleaned it and looks good now, even on the board, i dont see corrosion, i see a bit around the wifi area on both side, but very small corrosion)
 
I

ielectron

Member
the small board which is directly attached to hte lcd is water damaged, i removed the shield, there loads of BGA chips there, so im pretty sure it is the screen now,

Do you think it is possible to desolder the 2 large ribbon cable, so i can throw the small board into a ultrasonic cleaner? or its too much hassle?
 
I

ielectron

Member
on the small board on the lcd 820-00452-05 there is a sliver looking BGA, there was loads of water on it, cleaned it, removed it, one of the leg is burnt and missing, thats it, there is backlight but no picture. Will order new top part
 
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