A1398 U7310 820-00163-A

[hgoncalves]

Hi,

I have an A1398 820-00163-A, with a burnt U7310, and I have no other equal board to use other one. Only have 820-3332-A boards...

Can I use one from any other board?

 

[2informaticos]

Why would you want to solder FDMF6808N?
Didn't read many threads on the forum about its problems???
Get FDMF6708/3030 from reliable store; avoid any chinese seller!

First be sure CPU core power rail is not shorted to ground.
High chance U7310 killed CPU.

 

[hgoncalves]

Hi,

PPVCC_S0_CPU = 0.0018 in diode reading
I've replaced U7310 with a new FDMF6708, but I have no power. It pulls 0.24A from bench PSU, but no power.

 

[2informaticos]

Resistance to ground looks good.
But this doesn't mean CPU was not damaged...

 

[hgoncalves]

Hi,
In the morning the behavior was a bit different.
It puls 0.284 A in bench PSU, and i get 0.670V on L7310, but still no power on and no fan spin.

 

[hgoncalves]

Hi,
on PPVCC_S0_CPU it only has 0.68V from start. I starts and stays steady with 0.68V

 

[2informaticos]

Compare coils voltage with good board.

 

[hgoncalves]

Hi,
I don't have any known good board to compare it. Is there any other way?

 

[2informaticos]

Do you have any other A1398 working board?

 

[hgoncalves]

HI,

I don't have any other working board or working A1398 mac...

 

[2informaticos]

I suspect bad CPU, damaged by overvoltage...

 

[hgoncalves]

OK. Tks

 

[2informaticos]

The CPU core drop doesn't apply here; only valid for newer machines.
Very likely damaged CPU.

Please, open new thread when needed...

 

[GfilipeZ]

Yes, i should started a new thread. Sorry!

Thanks!