MacBook Air with diode burnt

[modesto1993]

Good morning everyone, I've been dealing with a MacBook Air 820-01521 for two days that suddenly stopped working. After much research I found damaged D3321 and D3320. I replaced them but the computer won't turn on. I have 5V on PP20V_USBC and the CPU at 0.90V stable. But no sign of life.

 

[2informaticos]

First of all, welcome to the forum!

"CPU at 0.90V stable"
Is that L7210/30 voltage?

 

[modesto1993]

First of all, welcome to the forum!

"CPU at 0.90V stable"
Is that L7210/30 voltage?

Thanks for the welcome! L7210 and L7230 have 0V

 

[2informaticos]

Then which CPU coil get 0.9V?

BTW, write directly into bottom reply box, instead of clicking Reply button.
I don't see any reason to quote an entire post, visible few centimeters above; thanks.

 

[modesto1993]

I checked again, the line was PP0V9_SLPDDR at present I get a slight heating of the motherboard if left connected for more than 1 minute

 

[2informaticos]

Is the machine recognized into DFU mode?

 

[modesto1993]

I haven't tried honestly, can I do this with a MacBook with USB and not USB-C?

 

[2informaticos]

Yes, in theory.
I did that some time ago.
But you should get a quality cable fot this purpose.