A1502 820-3476-A no boot

[hgoncalves]

Hi,

I have an A1502 820-3476-A that has green light, fan spin, CPU gets hot, but i don't get any image or boot.

Big coils have voltages, and it has no corrosion or liquid signs.

I'm not sure if it doesn't have image, or if it doesn't boot, but already tried with a known good lcd.

Can you help?

 

[2informaticos]

External video, USB activity?

 

[hgoncalves]

HI,

I forgetd to check USB activity...

It doesn't have any USB activity, nither external video

 

[2informaticos]

Try known good BIOS...

 

[hgoncalves]

With a clean ME, it's the same thing.

After updating the BIOS, on the first boot, it reboots twice (reading the clean ME I think), but then it has no usb activity.

I'm not sure if I missed before, but I don't get any voltage at L3095. All other big coils have voltages

 

[2informaticos]

Did you clean its BIOS, or flashed full new BIOS?
If suspect BIOS corruption, more than ME region, then need to test with different dump.

 

[hgoncalves]

I flushed with a full BIOS.
Do you have a known good one that can share?

 

[2informaticos]

820-3476-Working-CleanME.bin

drive.google.com

 

[hgoncalves]

TKS!

 

[hgoncalves]

Hi,

I've flashed it with the new file, but same result. Still no USB activity.

 

[2informaticos]

Then probably bad CPU...

 

[hgoncalves]

OK. tks.