820-00165-A - Turn on, but no chime

[menatwork]

dukefawks Can u give another hint?

 

[dukefawks]

Crap under SMC?

 

[menatwork]

No Title

 

[dukefawks]

Yes a low resolution picture of U1950.

 

[menatwork]

Just for you check: No corrosion
That part u ask me before to check and i replaced that.

 

[menatwork]

U5000 looks clean!

 

[menatwork]

dukefawks I can measure another component if you want.
Just guide me, please.

 

[dukefawks]

I really have no more ideas. No mouse light now and Vcore present?

 

[menatwork]

Yes, i get light on the mouse
C1037 - PPVCC_SO_CPU - 1.5v

 

[dukefawks]

Come on man, this machine is alive then. Do a PRAM reset and it must chime again.

 

[menatwork]

dukefawks I tried before!
I will keeping working on it.

 

[menatwork]

I just order a new U1950. Today i just put back and the CPU get really hot and then Shut down.
I get chime and everything, but back that point to shutdown.

 

[menatwork]

One thing i notice, usually this board the fan stop 2 times and then start.
But this board, i don't get that.
Do you have any idea why?

 

[dukefawks]

I don't know some of them don't do it. Put a heat sink on the CPU.....

 

[menatwork]

Yes, i did, but keeps really hot and shutdown

 

[dukefawks]

Yeah just like that 3437. I dunno man....

 

[menatwork]

What else i can check?
We are close to fix this board and i don't wanna give up.

 

[menatwork]

larossmann Can u help me?
I get the OS but after 5 seconds shutdown.
Can u guide me? Bc i really don't know what to do in this case.

 

[dukefawks]

Total shutdown or does it go into sleep?

 

[menatwork]

Total shutdown