Raspberry Pi 2, blown fuse...

[alex1403ia]

Hello this is my first post, I've been reading but there's not many información about Pi 2, so, this is my problem.

I was working on my Pi 2 and I blown the fuse, the symtoms are:
- green led infinite blinking, the red never turns on
- no video
- overheating F1 fuse in less than 10 secs smells burn
- the resistance on the fuse is 1ohm before power up the Pi, after connect to the USB power port the fuse resistance go higher immediately
- p3 and p7 pins give me ~3V with power connected
- p3 and one fuse pin give me 5V, and p3 and the other fuse pin gives ~3V with power connected

I've tried power up the Pi with 5V by GPIO pins 2 and 3, same result, just green led flashing in an infinite loop


I have another Pi of the same model but with burn SOC, so I can get its fuse, but I tried to desolder it but I can't, I don't know if there's a trick to get it out...

Any help, please!!

[alex1403ia]

Extra comment, I've not connected the Pi to power by two days, and when connected the result is the same

Please, any help, I've heard about putting a resistance in the fuse, I just want to know if the Pi is dead

[GTR2Fan]

I've tried power up the Pi with 5V by GPIO pins 2 and 3, same result, just green led flashing in an infinite loop

If it wasn't dead before then it probably is now. Pin 3 is GPIO2. It's not a power pin...

http://i.stack.imgur.com/Ct2JG.png

[alex1403ia]

I've tried power up the Pi with 5V by GPIO pins 2 and 3, same result, just green led flashing in an infinite loop

If it wasn't dead before then it probably is now. Pin 3 is GPIO2. It's not a power pin...

http://i.stack.imgur.com/Ct2JG.png

Was alive... In that picture I powered by pins 04 and 06.

[GTR2Fan]

Was alive... In that picture I powered by pins 04 and 06.

Ah. OK. Is the red power light on the Pi lit when you power it up via pins 4 and 6?

[alex1403ia]

Was alive... In that picture I powered by pins 04 and 06.

Ah. OK. Is the red power light on the Pi lit when you power it up via pins 4 and 6?

No, nothing, just blinking green light

[GTR2Fan]

No, nothing, just blinking green light

That's bad news I'm afraid. It's almost certainly dead then.

[alex1403ia]

No, nothing, just blinking green light

That's bad news I'm afraid. It's almost certainly dead then.

There's no way yo bypass the fuse??, or some last test??, when the red led turns off the Pi was connected by USB, not directly...

[klricks]

No, nothing, just blinking green light

That's bad news I'm afraid. It's almost certainly dead then.

There's no way yo bypass the fuse??, or some last test??, when the red led turns off the Pi was connected by USB, not directly...

Powering by GPIO 4 & 6 does bypass the fuse. Fuses blow for a reason. If the polyfuse is increasing in resistance then it is working as it should (reacting to a downstream fault). Note it takes several hours (overnight) without power for the resistance to go down. Does diode D2 get hot? If so remove it and try again. If any other parts get hot especially the SOC then the RPi is beyond repair.