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Thread: Having issues... *loads shotgun sound*

  1. #1
    Low Bitrate ph7ryan's Avatar
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    Having issues... *loads shotgun sound*

    (ALL COMPUTER WORK WAS DONE WITH ESD BRACELET CORRECTLY GROUNDED)

    so I decided to organize some wires behind my screen a few days ago, using zip ties etc, and I didn't realize that my carpc was still running... well I heard a shoring noise, a fuse blowing and a fan stopping within a fraction of a second, so I knew I would have to replace the fuse... I went ahead and finished tidying up, and replaced the fuse, (yes it was blown) and turned the key on the ignition, and only my amps boot up... hmmm....

    So I take the carpc out and inspect the internals... nothing seems wrong... I look at the fuse on my M2-atx 160 watt dc-dc, and the stock 15 watt fuse looks untouched, so I try it in the car and nothing... Well I decided to take it up to my bench, and plug in an atx desktop power supply, the little green light turns on, but when I activate the switch, nothing... no fans, or anything... after trying everything I could, I decided I probably blew something on the mobo, so I found an exact replacement (http://cgi.ebay.com/ws/eBayISAPI.dll...#ht_3459wt_937)...

    It got here today, so I unplugged all the original wires, and plugged them into the new mobo, according to the diagram in the manual. Brought it down to the car... same exact problem... green light shows up, but no action at all.... Bring it up to my desktop power supply... nothing.... plug my power supply into another known working computer... the other computer works great... I unplugged everything except for ram, and 4pin power and mobo power, and still nothing... not even a fan twitch... yes I am using the correct switch pins on the mobo... neither power on nor the reset switch will do anything for me... I thought it may be the ram, so I unplug the ram, hoping it would turn on, post and then turn off... NOTHING.... I am all out of ideas... any help would be EXCELLENT....

  2. #2
    MySQL Error soundman98's Avatar
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    just to make sure i understand completely.

    refastened some wires while pc was on.. pc shorted, turned off.

    appeared to be d945 motherboard bad, ordered replacement d945 motherboard, the m2 will not power up with either the current, or new d945 motherboards.

    connected m2 to another known good motherboard, works fine..

    according to what i understood, i would say that you have 2 bad d945 boards...

    otherwise, it might be a bad m2-- have you measured any voltages off of it when it is supposed to be running?

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    Low Bitrate ph7ryan's Avatar
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    good until you go to the m2... I used a desktop power supply (from a working computer) to *attempt to* power mycarpc... like, unplug the 4 pin, and the mobo plug (24 pin i think lol, i don't remember) and put the desktop ones in... this is how I powered it to install windows...

    wall----Desktop power supply-----carpc mobo = nothing...

    car-----m2-----carpc mobo = nothing....

    It popped into my mind that it was a dead mobo as well, but the chances of both mobo's doing the EXACT same thing, while still showing the green ok light, is pretty bad... I'm usually a very lucky person too.... if it comes down to it, I return it... I hate having to pay for return postage :/


    also, the amp's are hooked up to the same remote/acc wire as the carpc, and the amps work fine, so I know it is not the acc line that is bad...

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    Sooo....the one thing you haven't replaced is the M2. You've tried the SAME M2 with the 'bad' mobo and the 'good' mobo. If so, I'd say the culprit appears to be the M2.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
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    Confusion Master
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    It looks like there is now a fault on your M2, and plugging it into the new board caused it to fry as well. (possibly)



    Could be you are just not connecting something properly

  6. #6
    Low Bitrate ph7ryan's Avatar
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    I COULD possibly be forgetting to connect something ill check... I probably should have tried the new mobo in the desktop power supply first... I have a digital volt meter, where should I measure, and what should the power be? probably 13-14 volts at the input, and then 12 at the +12 of the 4 pin would mean that the whole 12 volts of the system would be working correctly right?

    attatched a picture of how I have it plugged in.... both the 4 pin and mobo plugs are coming from the pc case psu.... the red switch cable on the right top corner is a contact switch (originally for reset) on the case... it won't work with the switch nor a jumper quickly making contact.... the green light you see just above the ram is the mobo ok light... nothing else is plugged in...
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    MySQL Error soundman98's Avatar
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    the 4 pin molex connector(red,black,black,yellow) is the easiest place to measure--just power up the m3 in dumb mode:

    i always get it backwards, but i think the red and nearest black wire should be 12v, and the yellow, and other black wire should be 5v.(or vice-versa)

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    Confusion Master
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    Quote Originally Posted by soundman98 View Post
    the 4 pin molex connector(red,black,black,yellow) is the easiest place to measure--just power up the m3 in dumb mode:

    i always get it backwards, but i think the red and nearest black wire should be 12v, and the yellow, and other black wire should be 5v.(or vice-versa)

    Yellow= 12v
    Red=5v
    Black=Gnd


    Also if you want to power the PSU in 'dumb mode' you will need to GND the PWOK pin on the 20/24 pin connector. (ie jump the green wire to any black on the 20/24 pin connector)

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    Low Bitrate ph7ryan's Avatar
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    ok... I am busy right now, but I will check tomorrow morning, and update before noon... thanks for the help guys... its times like this that make me wonder why I ever paid 1000+ to deal with such issues... and then when it all turns back on and works like it did is when I finally realize... but right now its not working so I'm still about to rip my hair out....

  10. #10
    Low Bitrate ph7ryan's Avatar
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    alright. I don't know how to hook the psu into "dummy mode" so I plugged it into the car today, and I got a real quick processor twitch as soon as I plugged it in... I guess thats good, but I still was unable to boot it...

    I unplugged the molex from the screen power plug, and tested voltage and only was able to get like .11 out of the 5V, and 0 from the 12 volt, but I don't think it was hooked up right, because doesn't one of the pins on the mobo plug tell the psu that the computer is on... If the computer won't turn on, it can't put a signal on that wire, and thus there wouldn't be full voltage on any wire....

    how would I hook up the psu into "dummy mode"...

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