Raspi main chip getting very hot.


10 posts
by kumen » Sun Jan 06, 2013 5:53 pm
I turn on my Raspi today. It worked well. I went to do something else on pc and when I turn round and look to raspberry only red LED was shining and main chip was very hot. I unplug my ATX PC supply from Raspi GPIO and check voltage on it. It was OK(5,2V) I unplug LAN, TV via composite cable and 3.5 audio jack, USB nonpowered hub(keyboard, mouse, flash memory) and SD card. I was plug android charger to microUSB. Main chip began to heat up. I measure voltage between tp1 and tp2 -> cca 3V.
How could this happen?

Thanks for replies and sorry for my bad english.
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by redhawk » Sun Jan 06, 2013 7:03 pm
Main chip?? is this the IC at the centre of the board or next to the USB ports??

Richard S>
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by kumen » Sun Jan 06, 2013 9:11 pm
It is IC2 at the centre of the board on the 512MB version.
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by kumen » Tue Jan 08, 2013 5:41 pm
does anyone have any idea?
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by pluggy » Tue Jan 08, 2013 6:06 pm
If theres nothing connected to GPIO or USB and its heating up with the test point voltage at 3 volts from a micro-USB power supply. It sounds like something is fried.....

If you've been powering it from GPIO, you haven't connected to the wrong pins at any time ?
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by Burngate » Tue Jan 08, 2013 6:07 pm
I think you may have a broken Pi.

With nothing plugged in, measuring only 3v across TP1 / TP2 would indicate that something is very wrong.
By now, the poly-fuse will have "blown", trying to protect the Pi, but the damage has already happened.

You were powering it through the GPIO? then there was nothing to protect the Pi.

However, in all probability the SoC was already dying before any protection could have kicked in, and nothing you could have done could have prevented it

I've no idea if this could be claimed under the warranty
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by kumen » Tue Jan 08, 2013 9:45 pm
Yes I power Pi through the GPIO. Voltage on fuse is 0.3V -> looks like a good.
I bought it on Farnell. How can I enforce warranty?
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by pluggy » Tue Jan 08, 2013 11:22 pm
Send it back and plead ignorance ?

If you cooked it by misconnecting the power to the GPIO pins, its not going to be an official return....
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by gelfling6 » Wed Jan 09, 2013 9:38 pm
Almost kind of wonder, if someone were to mount a small aluminum block w/fins with a thermally conductive epoxy? (shades of some of the really OLD CPU's)
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by Burngate » Thu Jan 10, 2013 11:29 am
gelfling6 wrote:Almost kind of wonder, if someone were to mount a small aluminum block w/fins with a thermally conductive epoxy? (shades of some of the really OLD CPU's)

In normal circumstances, if it gets so hot that a heatsink makes a useful difference, then it's broken
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