On 18/08/2020 21:33, Martin Gregorie wrote:
> On Tue, 18 Aug 2020 21:22:55 +0100, druck wrote:
>
>> Hi,
>>
>> Looks like my Pi 4B died, red light only, no green flashes with no SD
>> Card, 5V and 3.3V ok, tried eeprom recovery to no avail. Any ideas
>> before I try to get it returned, as it was only bought in May.
>>
> Its a bit odd that swapping case and fan on a working board would kill
> it, so:

Yep.

> - Does the Pi come up if you switch back to the original case and fan?

Tried that.

> - I assume you've looked for debris/shorts etc in the new case, but have
>    you taken a multimeter to the new fan unit to look for wiring and/or
>    soldering errors? If not, that's probably worth doing.

Yes, tried just the bare board too.

I'd been using the fanshim for almost a year on my first Pi 4B, on which
I recently found the 2nd HDMI didn't work, where as the new on fired on
both ports, so decided to swap their intended roles. I got a large
passive heatsink case for the first one, and put the fanshim on the new
one, where its been working since May.

I had to put a very fine coating of solder on a couple of pins to get
the fanshim to work reliably on it's 2nd Pi, which literally took a
second to remove with an iron when I took off the fanshim, so I can't
believe that killed it. I used a magnifier to check there were no
whiskers, no solder had got under the shim.

---druck

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