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by dknute
Thu Nov 15, 2012 1:27 pm
Forum: Troubleshooting
Topic: Overheating problem with new 512MB model
Replies: 32
Views: 12366

Re: Overheating problem with new 512MB model

This might not be strictly temperature-related. Rather, a micro crack in one of the solder joints could be doing these. There is no common failure mode of so-called "cold solder joints". Even small temperature change can upset them and the electrical connection will be broken. Usually this is a good...
by dknute
Mon Nov 12, 2012 10:20 am
Forum: Troubleshooting
Topic: Fried HW?!
Replies: 8
Views: 1586

Re: Fried HW?!

Sorry to hear that. There's probably some internal damage inside the silicon structrure so there's very little you can do about that. I do have an idea to try though. Power up your RPi and then connect RUN (using P6 pin) to 3V3 via a 100 ohm resistor. Then measure the voltage on the pin. The point i...
by dknute
Sat Nov 10, 2012 3:15 pm
Forum: Troubleshooting
Topic: Fried HW?!
Replies: 8
Views: 1586

Re: Fried HW?!

According to schematics, there is a pull-up resistor R15 that should keep the P6 voltage at 3V3. To be sure I just measured it and it is indeed 3,265V on my device. You could try desoldering D18 to see if it helps, it's not a critical component. If this doesn't help I would also desolder C97 - it's ...
by dknute
Sat Nov 10, 2012 11:36 am
Forum: Troubleshooting
Topic: Fried HW?!
Replies: 8
Views: 1586

Re: Fried HW?!

There are protection diodes on pin 1 of P6 but the design is somewhat lacking - well, it was probably meant to protect the board from low energy transients rather than permanent short-circuit. What exactly happened to your RPi depends largely on the behaviour of the 3V3 regulator when it sees revers...
by dknute
Sat Nov 10, 2012 8:35 am
Forum: Troubleshooting
Topic: Overheating problem with new 512MB model
Replies: 32
Views: 12366

Re: Overheating problem with new 512MB model

IC2 is the RPi I'm afraid. It's the multi-layer chip that has CPU/GPU on the bottom and SDRAM on top. If it overheats while sitting there and doing nothing after boot, your RPi is inedeed faulty. But keep in mind that IC2 is allowed to get warm, even a bit hot during normal operation. It has an auto...
by dknute
Fri Nov 09, 2012 8:59 pm
Forum: Troubleshooting
Topic: Video on omxplayer - Possible to move it?
Replies: 2
Views: 1461

Re: Video on omxplayer - Possible to move it?

It seems omxplayer output is overlay-type surface, it just covers whatever there was under it. But in case the video size can't be rescaled to fit full screen (without stretching) some things will show through. I have the same problem, in fact I saw a similar thing reported on the forum but... that'...
by dknute
Thu Nov 08, 2012 9:45 pm
Forum: Troubleshooting
Topic: H.264 based TV stream
Replies: 0
Views: 748

H.264 based TV stream

I'm having some problems with omxplayer. I've upgraded to latest firmware boot files and that did fix that nasty chopping glitch that interlaced streams had, but I still can't play some files correctly. I have connected RPi to my LCD PC monitor via HDMI and I'm using 1920x1080 resolution without any...

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