Hot Pi


20 posts
by booysenc » Wed Dec 12, 2012 6:11 am
Hi,

Finally got my Pi and installed raspbmc using the windows installer, after that the pi booted but I didn't plug in any network cable, following morning I installed another image which did not work, tried the first one and also did not work, red light comes on but no picture.
Sometimes the colours are displayed but doesn't go further, other times the green light stays on but hangs, lately nothing happens, no colour display, no green light nothing...

tested the PSU which was fine (4.9V when tested on the test points), but the IC2 gets very hot, left it for a bit and all of a sudden the red light went out too, unplugged and plugged in but nothing, tested the PSU which is fine, tested the supply before the fuse and only gave1.9V so something is pulling the power down, fiddled around on the board, little but pushing here jiggling there and the led came back on but still refuses to boot!

tried 3 sd cards but doubt it's this, why did it work initially and now no more?
is the heat normal
also tried the steps in the troubleshooting wiki, tried other bootcode.bin as er the wiki but nothing

What's wrong?!
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by dknute » Wed Dec 12, 2012 3:25 pm
Could you please elaborate on this bit: "tested the supply before the fuse and only gave1.9V"? It's too low for the PCB to work but too high to think the fuse has tripped. Somewhat weird in other words.

IC2 might get somewhat hot but should not burn your fingers. It might be a problem with the Pi but before you send it back make 100% sure your PSU is working as it should be.
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by toysareforboys » Thu Dec 13, 2012 12:59 am
Test the voltage of F3 to D17 (touch the probes to the sides of the chips closest to the edge of the board). They are located on the bottom of the Pi board close to the microUSB jack.

My friend reported a similar issue, and his power supply was putting out a Pi cooking 5.78v :( After checking the specs (it was a cell phone charger) we found out it was a 5.5v supply.

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by booysenc » Thu Dec 13, 2012 9:30 am
Havent tested F3 to D17 but did test TP2 to F3 to test the supply voltage which was fine, or seemed to be...will test again

suspected the SD card so I bought one with raspberry pi OS preloaded, figured that will show if it is my SD card or the PI, still doesnt boot up, PWR led is lit with no ACT light coming on, dont have it connected to anything at this point (ACT has a feint glow but not really on)

Tried a few other power supplies and no one seems to get the ACT light going.

When I do connect it to the screen nothing happens either

Called RS components which is the supplier for South Africa and they indicated they don't do technical support, only sell it, had to send an email to raspberrypi@rswww.com and received an email to say that they are busy and expect a delay in response.

Now suspecting that the pi might be faulty, just doesnt seem as if there is support in south africa, now what!?
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by toysareforboys » Thu Dec 13, 2012 7:49 pm
booysenc wrote:When I do connect it to the screen nothing happens either
You will get NO display from the Pi unless it successfully boots from the SD card, no display at all!

I've created a new diagnostics boot image you can load onto your SD card. All it's designed to do is test if your SD card will boot in your Pi and give you display. No network, no usb, just display over HDMI (never tested composite but should work).

In IMG form, you can use Win32DiskImager to write it to the card (for Windows): http://ecuflashking.com/2012-12-06-Rasp ... g_boot.img

In ZIP form, you can just format your SD card FAT32, and unzip these files to the root of the SD card and it should boot: http://ecuflashking.com/2012-12-06-Rasp ... otcode.zip

When using either image, it's super important that if you're using HDMI, that your TV is turned on and selected to the correct HDMI input either before, or right as you power up the Pi. The Pi will look for the HDMI connection to the TV right when it powers up, if it doesn't see it, it'll default to composite output. Sometimes getting the timing right is tricky, because your TV might go to sleep before the Pi boots and recognizes it :(

Let me know if it boots with either of those images.

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by booysenc » Thu Dec 13, 2012 7:58 pm
Thanx, busy downloading, will test in a few minutes. Just a question, shouldnt the act led come on when it boots regardless of screen connected?
My pi doesnt light any other leds other than power even with the original OS SD card.
Got a mail to say I can return the pi and they will pay the postage, think it might be cheaper to send the new pi than to ship it from south africa to UK...
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by toysareforboys » Thu Dec 13, 2012 8:11 pm
booysenc wrote:shouldnt the act led come on when it boots regardless of screen connected?
The Pi only lights the ACT light once it's successfully found an OS and is booting it.

The problem with my images is that they boot in a tenth of a second, so it's hard to see the act light even if it's working properly ;)

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by booysenc » Thu Dec 13, 2012 8:53 pm
Nope doesnt work, didnt want to format the sd card I got today that has got the OS preloaded but used 4 others, one of which was working waaaaaaaaaaaaay back in the beginning. Formatted sd card and used win32disk to prepare the sd cards using external card reader, also used internal sd card reader in laptop on a second round of trying... still no picture.
Used blackberry charger and another 2A rated supply so that shouldnt be a problem.

PWR led stays lit and nothing on tv or ACT led.

Dont want to send it back because expected delivery is now only in april next year, scared i will go back in the queue, ordered this one i got on monday in july already! Obviously i also dont have a use for a busted one.

Help!

Anything else i can do?
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by toysareforboys » Thu Dec 13, 2012 11:41 pm
If your pi dun boot those images, not much hope for it :(

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by rudiel » Wed Dec 19, 2012 6:30 pm
Same problem here. I am also in SA. My RPi boots but shuts down ('crashes') after a while 1-5 min. Then I am stuck. This is really a powerful and fun thing to play with at ZAR 300 but frustrating if it shuts and you don't know the reason. Please can anyone help ?
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by toysareforboys » Wed Dec 19, 2012 6:50 pm
rudiel wrote:Same problem here. I am also in SA. My RPi boots but shuts down ('crashes') after a while 1-5 min. Then I am stuck. This is really a powerful and fun thing to play with at ZAR 300 but frustrating if it shuts and you don't know the reason. Please can anyone help ?
Best thing to do is check your TP1-TP2 voltages DURING the bootup of the Pi. Pay attention to the lowest number you see. Ideally you want 4.9ish and over, but most people using crappy microUSB cables won't get that. If you can do 4.85 and over you should be fine, but 4.8 or under is gonna cause you problems.

Image

What a crappy MicroUSB cable does for your Pi: http://www.youtube.com/watch?v=lNDeQMNCOiw

The best MicroUSB cable: http://www.monoprice.com/products/produ ... 1&format=2

Also remember, there were a ton of bad Pi's shipped out that were under cooked at the factory. Your only option may be to either re-cook it in your oven (upside down, on tinfoil, on baking pan, 2 mins at 500f preheated seems about perfect for most) or send it back for a replacement. Obviously cooking it in your oven would void the warranty: http://gough.ath.cx/?p=160

My undercooked Pi :( http://www.youtube.com/watch?v=SsMPBcVCw10#t=215s

Good luck.

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by rudiel » Wed Dec 19, 2012 7:00 pm
Hi Guys
Yes it looks like the power may be a problem. It drops as low as 4.33 V during boot (connected to my PC's USB port). I am not sure if my Multimeter is very accurate though. I will however try different USB cables as well as PSU's 5V to get a proper 5 V supply. Thanks for the comments !!!
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by toysareforboys » Wed Dec 19, 2012 7:07 pm
rudiel wrote:It drops as low as 4.33 V during boot
Sounds like crappy microUSB cable ;)

4.33v will cause you nothing but headaches!

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by rudiel » Thu Dec 20, 2012 1:35 pm
Thanks everyone! My problem was solved by using a proper 5V supply that I took from and old router that I had lying around. Connected the microusb cable and voila, I had generous uptime on the RPi. I left it on last night however it still seems to have shut again when I looked this morning. But as you guys suggested, make sure you have a good USB power cable as well as a good 5V supply....

Thanks again
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by -rst- » Thu Dec 20, 2012 5:14 pm
rudiel wrote:... I left it on last night however it still seems to have shut again when I looked this morning....


Did it shut down or just go to sleep mode (turn display signal off)?
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by rudiel » Fri Dec 21, 2012 9:09 pm
I am not sure about the display going into sleep ? How do I check this. I am not running a connected HDMI or RCA Display.. Only running it as a networked host. But now I found something else though. The RPi started shutting intermittently every now and again. I removed the large Capacitor (which seemed to be loosely soldered), close to the Micro USB power connector. Now so far I have 5 hrs 27 min uptime. Could this capacitor be the main source of the problem.

Anyway I am happy with the uptime so far. Will monitor it overnight again ...
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by toysareforboys » Fri Dec 21, 2012 11:08 pm
rudiel wrote:I removed the large Capacitor (which seemed to be loosely soldered), close to the Micro USB power connector.
The C6 capacitor? It's not required for the operation of the Pi. It's primary purpose is to prevent the Pi from rebooting when plugging in USB devices.

They used a pretty low quality C6 cap, and probably undersized for the job at hand, the Pi reboots when you plug in some USB devices even with it.

Image

If you want to improve on their design, replace C6 with this: http://www.digikey.com/product-detail/e ... -ND/564001

That unit has bigger capacitance, reacts faster (tantalum), and is better for the Pi because you won't knock it off accidentally like you do with C6!! When I install them on peoples Pi's I lay it on top of the very inefficient linear voltage regulator RG2 (which I usually replace for people with a switching buck regulator, but that's for another thread). Super solid and no more rebooting when hot plugging USB devices :)

-Jamie M.
Seagate GoFlex Home, 1.2GHz ARM (kirkwood), 128MB RAM, Gigabit Ethernet, SATA2. Sandisk Extreme 120GB SSD running Arch ARM Linux 3.6.11-0. nginx + php-fpm = LIVE STATUS hosted right on the SGFH!! http://tafb.yi.org
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by rudiel » Tue Dec 25, 2012 7:16 pm
Me again.
Thanks for the great info on the C6 cap.

However still getting my Pi to shut (hang) by itself every now and again. I manage to get it running for several hours sometimes, sometimes several minutes, sometimes only for a few seconds. What could be wrong ? Is it the SD Card, the hardware, the PSU I don't know.

I am so impressed with the whole Raspberry Pi concept. I am just saddened by the fact that the hardware quality seems to have been somewhat compromised when they built the unit. I truly belive that this one's a dud. I surely hope so because if I have to get another one, it will have to give me decent uptime. Once I get this, I will be satisfied. Then the sky is the limit. Just imagine, GPIO, C / Python Programming / MySQL / Webserver.

Please guys at the RPi Foundation - Make the hardware more reliable and resilient!!!
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by malakai » Tue Dec 25, 2012 7:20 pm
The C6 isn't even needed many threads and discussions it's put there out of form but if your powersupply already has one and now a days they should it is just there for looks.

As to uptime go over the wiki and the troubleshooting steps it is possible it has a flaw it's rare but does occur.

http://elinux.org/R-Pi_Troubleshooting
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by rudiel » Tue Jan 01, 2013 10:14 am
Hi Guys,
I seem to be getting better uptime on my Pi now. I just hope the hardware holds out !!! Its been running for 14 hrs now without shutting.

But as far as the rest goes I am very impressed. I am running an MySQL database and manged to connect to it using Python. My only problem so far still is getting the backed up image to be written to an SD card. There is a script called rpi-wiggle which seems to do the job I will have a look.

Anyways the originator of this post. You are also in SA ? Have you got your Pi hardware sorted out ?
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