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Thread: DSATX 5v line failing

  1. #1
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    DSATX 5v line failing

    The computer freezes while booting. It’s always at the Windows boot screen, with the green bar at the bottom.

    First of all, if I boot with a 300w generic brand AC PSU, it works every time.

    If I boot with the DSATX PSU, if freezes every time, on the same screen. Right as it freezes, I can hear the hard drive click. So, I got out my Fluke 179, set I it to measure DC, and record minimums, and got to testing. The 179 beeps each time a value lower than the lowest so far recorded, is detected. Measuring 12v, the 179 reports about 12.04, and never beeps once the POST is completed, indicating stable 12V through the freeze. If I set to record 5v, it stays at a steady ~5.01v all the way up to the freeze, and right before it freezes I hear about 5 beeps (indicating 5 steps downward) and the meter reports a lowest recordable value of about 4.8 volts. This doesn’t mean that 4.8v is the lowest spike, it means that the meter can only record so fast, if that makes sense. It can beep on a downward spike and not change the recorded reading, if the spike was too short.


    I do not own an oscilloscope, so this is the best I can do for you from the field.

    I even unplugged all devices but the motherboard and HD, and it doesn’t help. This has been going on for the past few days, but usually a reboot fixed it.

    Any help is appreciated.

  2. #2
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    Quote Originally Posted by greenman100
    The computer freezes while booting. It’s always at the Windows boot screen, with the green bar at the bottom.

    First of all, if I boot with a 300w generic brand AC PSU, it works every time.

    If I boot with the DSATX PSU, if freezes every time, on the same screen. Right as it freezes, I can hear the hard drive click. So, I got out my Fluke 179, set I it to measure DC, and record minimums, and got to testing. The 179 beeps each time a value lower than the lowest so far recorded, is detected. Measuring 12v, the 179 reports about 12.04, and never beeps once the POST is completed, indicating stable 12V through the freeze. If I set to record 5v, it stays at a steady ~5.01v all the way up to the freeze, and right before it freezes I hear about 5 beeps (indicating 5 steps downward) and the meter reports a lowest recordable value of about 4.8 volts. This doesn’t mean that 4.8v is the lowest spike, it means that the meter can only record so fast, if that makes sense. It can beep on a downward spike and not change the recorded reading, if the spike was too short.


    I do not own an oscilloscope, so this is the best I can do for you from the field.

    I even unplugged all devices but the motherboard and HD, and it doesn’t help. This has been going on for the past few days, but usually a reboot fixed it.

    Any help is appreciated.
    If you have an analog meter you will see the needle sweep up and down (something that digital units are just not good at doing). Also, is the voltage dropping (hence the beeping) and then rising again. If not, can you take "live" measurements of the 5 volt rail and see what the readings are. If the PS fails to power the computer, and you think it is the 5 volt line, 4.8 shouldn't make any difference to the MB.

    Also, make sure that you are not exceeding the amperage rating of the 5 volt rail. Drawing too many amps from a PS WILL cause the voltage to drop. If your fluke measure amperage in the 5 to 10 amp range, try and measure to see if there is an amperage spike.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    Quote Originally Posted by Wiredwrx
    If you have an analog meter you will see the needle sweep up and down (something that digital units are just not good at doing). Also, is the voltage dropping (hence the beeping) and then rising again. If not, can you take "live" measurements of the 5 volt rail and see what the readings are. If the PS fails to power the computer, and you think it is the 5 volt line, 4.8 shouldn't make any difference to the MB.

    Also, make sure that you are not exceeding the amperage rating of the 5 volt rail. Drawing too many amps from a PS WILL cause the voltage to drop. If your fluke measure amperage in the 5 to 10 amp range, try and measure to see if there is an amperage spike.

    Michael
    I don't have an analog meter.

    Its dropping below 4.8, I KNOW it. My meter just can't see the spike.

    If it's not the 5 volt rail on the PSU, then why's it boot fine with the AC PSU? I know it's not overloaded, all I have attached is a hardrive and the motherboard.

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    sound like a PSU issue to me. not that it should matter but what mobo / CPU are you using? no video cards or sound cars plugged in?
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    maybe another testing idea would be to disable the onboard sound / video, Windows is likey initializing it during that screen and maybe it has somthing to do with the drop. Although again if it works inside on the AC-DC 300 I dont see what the difference would be. What are the amps on the AC-DC 5v rail?
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  6. #6
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    Quote Originally Posted by alti
    maybe another testing idea would be to disable the onboard sound / video, Windows is likey initializing it during that screen and maybe it has somthing to do with the drop. Although again if it works inside on the AC-DC 300 I dont see what the difference would be. What are the amps on the AC-AC 5v rail?

    The last sentence is what I am talking about. And of course the MB and CPU being used matters, why would you think it doesn't. The motherboard/CPU or accessories may be drawing toooooo much amperage on the 5 volt line, dropping the voltage. Just because your 300 watt AC-DC PS is powering it fine, does not mean that a similar speced DC-DC will power it fine, because they may have (and in this case, since the DSATX I think is only 200 watts) the specs on the 5 volt rail WILL BE DIFFERENT.

    Next, what about USB devices. Does your fluke have Amp meter. Check Amperage draw of your MB to be sure it is not exceeding the specs.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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    All the USBs are unplugged, and I don't have onboard sound or video. It's a real old board, and a Duron 950 CPU.

    As I was out there working just now, the PSU pulled an Alti. won't boot, no LED. I have it inside and am working on it.

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    Quote Originally Posted by greenman100
    All the USBs are unplugged, and I don't have onboard sound or video. It's a real old board, and a Duron 950 CPU.

    As I was out there working just now, the PSU pulled an Alti. won't boot, no LED. I have it inside and am working on it.

    Any serial data?

    Michael

    P.S. I just found this site.http://users.erols.com/chare/elec.htm It list the Duron 950 at 25amps and 40 watts. Yes, that is at 1.5 volts, but that 1.5 volts is coming from someplace, and it is probably the 5 volt rail.

    Just keep that in mind.
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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  10. #10
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    I hit a snag, I dont have a serial cable I butchered the one i had to make my XM cable. I got it inside and plugged it in and the LED on the brainstem is on. so I know that the terminal reset should work

    Its already 9:00 pm est time stores will be closed i am going to have wait till the morning when i can go get a cable
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