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Thread: Real live carputer temperatures

  1. #1
    Constant Bitrate
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    Real live carputer temperatures

    So in support of Scrouse Monkey, and jcdillians efforts to create a backlight upgrade , I've decided to contribute by keeping a log of my carputer's LCD temperature so they and others would have an idea of how hot an LCD can get while installed. Then I thought why not go ahead post all my system temps for others who may be wondering about harddrives CPUs and other component temperatures. So here it is. See my sig for system specs. There is no backing on the LCD panel (250 nits) and I have quite a bit of space behind the LCD to keep it cool.

    Now for a couple of notes:
    • Case temp is the motherboard sensor. It reads low.
    • Hard drive temp is measured by the sensor built into the drive
    • Regulator sensor is a max1989 remote sensor located in a custom regulator case
    • Monitor is a max1989 remote sensor located in the middle of the display
    • Ambient temp is about the same as the regulator temp. I'll add an air temp sensor soon...


    So most of the trips I've taken have been short ones so many of the components haven't reached a steady state temp yet. Each significant dip in temperature corresponds to the end of a trip and the beginning of a new one. As soon as I take a longer trip I'll update the post with new data. For those of you interested in adding temp sensors this is how I added sensors to my system.

    cheers,
    momanz
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  2. #2
    Maximum Bitrate Change's Avatar
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    Where's the PC located, and what cooling do you have with it?

    Ambient temperatures will definitely be helpful, I think.

  3. #3
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by momanz
    Scrouse Monkey and jcdillians
    hehe Scrouse and Dillian! hehe

    good work momanz. When you say located in the middle of the LCD where do you mean? on the front of the panel or behind the backlight? Ideally i am going to fit a temp sensor inside the backlight module permanantly so i can keep an eye on it and possibly link this into our dimming control for both heating and cooling purposes. ie in cold weather the CCFLs are not as bright so you need to add more current to warm them (something the inverters we are looking at can do) and also if the screen is getting to hoot we could do the reverse and dim the screen if the temp is critical or even shut it down to prevent damage.

    I would like to place a sensor between the diffusers and the panel or the panel and the TS to measure the panel temp but we would have to be very careful with this or use a blown LCD and it would just be for testing as you dont want a a temp sensor visable in the middle of the screen.

  4. #4
    MySQL Error Scouse Monkey's Avatar
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    Just another thing. 35deg is fine for the screen. I don;t have the datasheet but i am sure it is ok. I have a sharp automotive screen that can operate from -30 to 85 deg C and I am not saying the Xenacs or lilliputs can do this but they won't be far off. Probably in the region -5 to 60 deg C.

  5. #5
    Variable Bitrate HybridFox's Avatar
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    holy $}{!7 your cpu is reaching 50C....
    i just made my new comp and i remember reading that my cpu wont like going above 38C

  6. #6
    MySQL Error Scouse Monkey's Avatar
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    50deg C is fine for a CPU. 38 is a normal temp for my PC at idle.

  7. #7
    Constant Bitrate
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    Quote Originally Posted by Change
    Where's the PC located, and what cooling do you have with it?Ambient temperatures will definitely be helpful, I think.
    PC is under the passenger seat and is cooled by the 4500rpm CPU fan.

    Quote Originally Posted by Scouse
    hehe Scrouse and Dillian! hehe
    long day at work...
    The sensor is on the back of the LCD panel just about in the middle. I haven't had the guts to open this thing up yet, although I'm thinking I may soon, because I am getting fed up with how crappy the screen is. I think overheat protection is a good idea, although I'm not sure that dynamic control of the backlight based on temp may be a good idea. If I'm an end user and the backlight isn't working at full tilt during the brightest (and usually hottest) part of the day I'm not too sure I'd be happy. Better to fix any thermal issues in the design rather than limit the light output. (just my 2 cents you guys are in charge)

    Quote Originally Posted by HybridFox
    holy $}{!7 your cpu is reaching 50C....
    The C3chips have an on die temp sensor and the epia motherboards use this sensor to read temperature. Many older boards place a thermistor in close proximity to the cpu to give you a cpu temperature. Readings from these sensors tend to be quite a bit lower that the actual CPU temp. My particular C3 will run up to about 85C before it locks up. I have my system set to shut down at 78C to prevent damage. Be warned though not all CPUs are created equal and they may lock up at different temperatures.

    -momanz
    Carputer installed!!!
    Nlited XP+Minlogon, EpiaM10k, 512mb, Seagate 40 gig 2.5" HD, FM Dlink usb radio, DWL122 USB Wifi, XMD1000 tuner, PT5071 6 amp regulator, Xenarc 700TSV, and 1 ikea key box.

  8. #8
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by momanz
    I'm not sure that dynamic control of the backlight based on temp may be a good idea. If I'm an end user and the backlight isn't working at full tilt during the brightest (and usually hottest) part of the day I'm not too sure I'd be happy. Better to fix any thermal issues in the design rather than limit the light output. (just my 2 cents you guys are in charge)
    it would purely there as a safety cut in to stop your knackering your screen. I know exactly what you mean by the hotest time of the day being the brightest but i would rather have my screen go dim than blow. We don't have control over how people install their screens so the best we can do is build in a safe-guard (if we ever do it). I will have a fan behind the open back as it will be molded into my dash on my main screen (the other is a secret and will be nicely warmed up and cooled down by the car ). Keeping the air moving around the back will be important but I have seens ome people doing stupid things so i would like to design for the worst case scenario.

    Also, a lot of the time your car will be roasting hot when you get in then cools down as you put the aircon on or open windows.

    We are also getting a lot of requests from people wanting to fit this in the existing housing which is really gonna make cooling it a ***** (i envisage taking out the speakers and having a lot of cooling holes).

  9. #9
    FLAC strohj's Avatar
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    I just installed a fan behind my LCD.... it works wonders to cool it down...

    I found that i had trouble before during long road trips.. the screen would overheat after about 4-5 hours of use and shut down
    Pentium 4m 1.5GHz|MB896|Roadie Extreme|XM-Direct|Rikaline 6010|T-View 7"|Streetdeck|160gb Western Digital|1Gb DDR2-533 Ram

  10. #10
    Constant Bitrate
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    Thanks for the info, I'll watch for this behaviour. Is your LCD still in the case or is the panel exposed to open (or semi open) space in your dash? 250nit, 400nit?
    Carputer installed!!!
    Nlited XP+Minlogon, EpiaM10k, 512mb, Seagate 40 gig 2.5" HD, FM Dlink usb radio, DWL122 USB Wifi, XMD1000 tuner, PT5071 6 amp regulator, Xenarc 700TSV, and 1 ikea key box.

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