820-3023 3 beeps


New member
Check DDRREG for corrosion or pry damage. Or shorted components. I fixed one with corroded resistors and caps on that line.
I've known someone who would reflow the RAM chips to fix possible broken balls.


Super Moderator
Staff member
Put the board in an oven at 250*F for 5 min... Then reflow the ram... If you don't have a good hot air station your screwed. Use lots of flux and a big nozzle.


Why do you put it in Oven for 5 minute?
To give the board an even heat.
Without preheating the board, a lot of the heat applied with the rework gun will be lost into the ground planes of the board resulting in "popcorning" the chips.


New member
Well, that I do is preheat it in rework machine and then remove them with hot gun. Much easier I think and much.


I second reflow RAM. The boards are long but not very wide, they are susceptible to flexing when abused. I have fixed several macbook airs with this issue from schools. Preheated board, used proper flux. They haven't come back.