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Topic: Dead board (Read 520 times) previous topic - next topic

thripper

May 22, 2013, 01:08 am Last Edit: May 22, 2013, 01:11 am by thripper Reason: 1
Hello,

So today I found that I can't flash the due anymore.

Background:
The board is recognized when connecting to the PC (programming port) and there is some LED flashing when I try to program it but that fails.
Native port programming also does not work.
There was never any peripheral connected to this board, just some LED L sample blinking programs.

I tried so find the source of the issue, here's what I have so far:

Onboard 5V is OK (L4 output)
Onboard 3v3 is OK ( output of IC4)
"ON" LED is On
L LED is on ( pullup somewhere ?)
VDDOUT is ~ 0.2 V ( Should be 1.8V) - This is not OK
VDDIN, VDDIO1 - VDDIO4 are 3.3V
The µC is overheating really fast - can't touch it in about 1 minute.

Current drawn ~ 550mA - This is way too much.
Resistance between 3.v3 pin and GND is ~5 ohm (unpowered board) - BAD  but consistent with current

Any hints ?
For the moment it looks like a shorted µC
Can someone reproduce these measurements (after erasing flash) ?

Thank you !



Graynomad

Quote
VDDOUT is ~ 0.2 V ( Should be 1.8V) - This is not OK

Quote
The µC is overheating really fast - can't touch it in about 1 minute.

Quote
Current drawn ~ 550mA - This is way too much.


I would say you've cooked the CPU.

_____
Rob
Rob Gray aka the GRAYnomad www.robgray.com

thripper



I would say you've cooked the CPU.

_____
Rob


I agree.

Anyway, this should not happen with nothing connected to the board. Supply seems stable (USB or external)
Well, I'll leave this post here in case anyone else has the same issue.

cowasaki

I'd return it to be honest.  That really shouldn't happen. 

I bought one of the clones and hadn't used the native port at all then plugged a lead into it and about ten minutes later found the lead detached with the usb port still on it!  looks like the usb port and pads was just ripped off the board because the solder tangs were bent over and had attached physically so the only thing holding the port on was the pads!  Looks like the genuine one I bought is FAR better built that the alternative.  I will email them and see if they swap it before I name and shame them though!

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