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Board is too hot

posted in Uncategorized
Thursday, March 17 2011, 12:49 PM
kgreg
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I have two IGEP2 revC boards. One of them
[color="#BF0000"]gets extremely hot (> 60°C)[/color]
after a while. I cannot hold my finger on most of ICs. :( The other board is fine, I can hold my finger there. I\\\'m afraid the board will break or its life time will be shorten drastically. Does anybody know what can be the reason of such an extreme warming up and how to reduce it :?:
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  • Accepted Answer

    mcaro
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    Thursday, March 17 2011, 05:16 PM - #permalink
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    Do you\\\'ve the audio pre-drive amplifier enabled¿? Manel
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    kgreg
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    Friday, March 18 2011, 09:24 AM - #permalink
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    How can I find out ?
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    mcaro
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    Friday, March 18 2011, 02:35 PM - #permalink
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    You can execute alsamixer Manel
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    epaillet
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    Monday, March 21 2011, 11:04 AM - #permalink
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    I have also remarked this problem a while ago. If the preamplifier is enabled in alsamixer, the TPS65950 gets very very hot in a few seconds. Is this a hardware bug, can this destroy the board, or is there some sort of thermal protection?
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    mcaro
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    Wednesday, March 23 2011, 12:29 AM - #permalink
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    Is this a hardware bug
    No, this board it\\\'s not designed for use it.
    can this destroy the board
    Yes, it can up to 110ºC ...
    or is there some sort of thermal protection?
    Some devices has a thermal protection but it not protect the rest ... in fact the most located heat source it\\\'s near the audio input connector pad (the head source come from the GND plane). Manel
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    kgreg
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    Thursday, March 24 2011, 12:44 PM - #permalink
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    I tried to mute everything with alsamixer, but the board is still hot. I measured the current consumption and it is 1300 mA ! The power supply drops to 4.8 V. I will try to turn off WiFi module.
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    mcaro
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    Thursday, March 24 2011, 12:57 PM - #permalink
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    What kernel and rootfs do you\\\'ve installed ? Due 1.3A consumption it\\\'s not normal .... DO you\\\'ve any USB device connected? Manel
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    kgreg
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    Thursday, March 24 2011, 02:46 PM - #permalink
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    I tested with Poky Sato as provided from ISEE (kernel 2.6.28) and Angstrom dist. from BeagleBoard community (kernel 2.6.37, our own build). The results are the same. The board takes 1.3 A at startup and it drops to 1.16 after the linux is booted. I tried the original u-boot loader because I was using our own which setups some of GPIO signals and the results are still the same.
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    kgreg
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    Thursday, March 24 2011, 05:27 PM - #permalink
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    It\\\'s definitely not related with kernel. I blocked the boot process at u-boot level and the heating is still there. TPS65960 and CPU get hot very fast (< 10 seconds). One of these has the problem. I suppose the core reason is in CPU. Overheating of TPS is the 2nd effect of too much current flowing to CPU. What can be the reason for CPU to be so hot ?
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  • Accepted Answer

    mcaro
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    Thursday, March 24 2011, 11:07 PM - #permalink
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    Did you used the GPIO signals or other signals connected directly to the CPU? Manel
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    kgreg
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    Thursday, March 24 2011, 11:38 PM - #permalink
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    Yes I did use some signals in GPIO mode from J990 connector. Do you think that I maybe shortcuted some of them by chance and it broke CPU but didn\\\'t damage it fully ? I will try to test all of them.
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    mcaro
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    Thursday, March 24 2011, 11:50 PM - #permalink
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    Yes it\\\'s possible :( We\\\'ve some experiences with this case, the OMAP it\\\'s not completely destroyed only be damaged a internal pulldown or pullup but enough for get a internal short circuit. Manel
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    fmartens
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    Friday, July 29 2011, 11:52 AM - #permalink
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    Hi, I would like to use this thread to post some findings also: I am running QNX and the audio predriver has been switched off using: twl4030_i2c_write( 0x49, 0x25, 0x0); twl4030_i2c_write( 0x49, 0x26, 0x0); Still the CPU and TPS65950 are warm/hot. I also noticed that the screen blanks when the temp op the CPU and TPS are high. Putting my thumb on the IC or cooling the CPU and TPS by air seems to solve the screen blanking. I am using WIFI on the board, might that be a problem? I am also running the Android image which does not use WIFI. The CPU and TPS temperatures are acceptable. Is there anyone who could give me some pointers to investigate further? Regards, Freddy
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    fmartens
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    Monday, August 01 2011, 12:43 AM - #permalink
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    Ok, this is what i also tried: 1) disabled WIFI driver and used SMC --> no change, still hot 2) disconnected USB hub from board --> no change, still hot Is there more I can try to run the board cooler?
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    fmartens
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    Tuesday, August 02 2011, 07:24 PM - #permalink
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    Same with the latest android image. CPU and TPS65950 are getting hot after 20 minutes or so (can touch it for a few seconds but then I need to let go). The system is idle. I still need to measure the current, did not had the time to do that.
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  • Accepted Answer

    mcaro
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    Wednesday, August 03 2011, 11:37 AM - #permalink
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    Do you know the board temperature? Manel
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    fmartens
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    Thursday, August 04 2011, 09:27 AM - #permalink
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    Nope, I need to find a digital thermometer. The ones we have stop at 44 degrees celcius :-)
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  • Accepted Answer

    mike_haben
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    Friday, August 05 2011, 12:11 PM - #permalink
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    In case it\\\'s useful... I\\\'ve been making some 5V supply-current and board-temperature measurements on an IGEPv2 running the as-supplied Poky Linux: At login prompt, with green LED flashing: 575mA With green LED disabled: 542mA DVI chip disabled (nPD line pulled down): 439mA WiFi/Bluetooth module disabled (nPD pulled down): 358mA Ethernet IC held in reset (GPIO64 pulled down): 295mA In all cases, the TPS65950 chip is the hottest device on the board; its temperature varies from ~50C at maximum current down to about 42C in the 295mA case. Mike H.
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    Tuesday, August 23 2011, 10:13 PM - #permalink
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    I don\\\'t know whether it is related to this topic or not, but in last few days my igep board occasionally hangs... only solution then is reboot. CPU on board is very hot, hardly I can touch it. It\\\'s warm weather now (over 30 degrees), but I don\\\'t know if it is normal... I hope it is not, I don\\\'t want to use some fan or so. My board is IGEPv2 Board - OMAP3530 - RC Series 720Mhz NOWIFI
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  • Accepted Answer

    mcaro
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    Wednesday, August 24 2011, 11:04 AM - #permalink
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    30 deg or 40 deg, it\\\'s normal
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