820-4924-a backlight

[wirelessplanet]

Liquid damaged board. I cleaned it out, but the blacklight will randomly start flickering. It maybe does it for 30-60 seconds an hour. Don't know where to start.

 

[dukefawks]

Check corrosion around U7700 and LCD connector. Make sure the LCD is known good too.

 

[wirelessplanet]

I changed the LCD still same issue. I don't have a schematic for this logic board. Where is the U7700? There was no corrosion near lcd connector. Only on the back around thunderbolt connections.

 

[dukefawks]

Did you use an LCD assembly for 2015 model, only those will work. Schematic can be found with Google.

 

[wirelessplanet]

Yes I used my shops macbook lcd (which is a 2015). I was hoping to save the $20 to buy the schematic but no worries. I found the u7700, no corrosion around that area.

On a side note: the 2013/2014 lcd works as well. they are the same lcd for future reference.

 

[dukefawks]

You can find the schematics for free too. 4924 is everywhere if you look.
Could also be the lid sensor, check corrosion around J5250

 

[wirelessplanet]

J5250 was really pretty corroded. I reflowed that part but it hasn't helped. I'll replace that and let you know.