820-3023 No damage, 3 RAM beeps

[Jay]

History unknown but no signs of liquid damage or drop damage to the case. 3 beeps on boot and fan goes 100% within 20 sec. No solder balls around RAM area or CPU area. From another post I read "I just know that 3 beep boards when L7330 has 1.5V are a nightmare." I get 1.5V on L7330...

smiba ​​Also another post from smiba "Lots of Macbook Air 13" 2011's with ram issues"​​​​​

I find no other posts with RAM beep issues apart from those two. Has this apparently common issue been resolved by a known fix or is this a "don't bother just go on to the next repair" kind of deal?

CPU gets hot, all RAM modules feel equally hot as well and power draw on PSU is just under 1 amp.

 

[Sykulski]

It is probably the Cougar Point PCH that's failing. The known permanent fix would be replace the PCH as reflowing it is temporary (because it is a FCBGA).

 

[Gurmon]

Memory is connected to the CPU.
Dont reflow the CPU or PCH, you need to rule out the RAM first, since you have already confirmed voltage to the RAM, Your looking at bad RAM chips or at least one with a cracked solderball.

 

[dukefawks]

Hopeless. Dead RAM, bad soldering, bad traces or dead CPU. Take your pick but any of them would be a write off.

 

[Jay]

Thanks for the replies gents, this one went into the no-fix bin. Case closed.