A1932 820-01521 no USB activity

[hgoncalves]

Hi.

I have an A1932 820-01521 that seams to power on, but has no USB activity.

It puls 20V from bench PSU, reaches 0.8A and than stabalizes at 0.570A (without battery connected).

CPU gets hot, fan spins but no image.

L7410, L7430 have 0V. and 0.008 on diode reading.

Can you help?

 

[2informaticos]

Bad CPU, if gets hot without core voltage.

 

[hgoncalves]

Hi.

But on CPUCORE_PHASE1 and CPUCORE_PHASE2 (L7210 / L7230) I have 1V.

Only L7410 and 7430 have 0V.

Do you still think that it is a bad CPU?

 

[2informaticos]

You've edited your pot.
First time L7210 was listed too...

Try turning on with good battery connected.
Also test disconnecting audio flex.

Did you try DFU?

 

[hgoncalves]

Hi.

Yes, I'm sorry. I made an error and when I noticed it, I edited the post, thinking that you had not sean it yet. Sorry.

I already tried without the audio board connected, with a known good battery, and did DFU restore but with no success. Still no power on.

 

[2informaticos]

"did DFU restore but with no success"
Got error?

 

[hgoncalves]

DFU went until the end without errors, and at the end just shows the lock icon.

 

[2informaticos]

Caps Lock LED not reacting?

 

[hgoncalves]

No, Caps is not working.

 

[2informaticos]

Possibly bad CPU...