Page 23 of 30 FirstFirst ... 131415161718192021222324252627282930 LastLast
Results 221 to 230 of 297

Thread: Everything You need to know about your M4 ATX

  1. #221
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    879
    Quote Originally Posted by kasemodz View Post
    Well, i did more probing and I discovered the problem. The on/off headers come on but they are on for too long. So from the computer side, the computer receives the pulse to turn on and it turns on, but the "on" moment lasts forever, thus the computer shuts off. Its kind of like pressing the on button on a computer and holding the button. The computer will turn on, but then turn off as well.

    The “on pulse” time is programmable in the M4.
    Does it eventually release the line back to an open state?
    There may be a quick workaround you could try if it does, and all else fails.

  2. #222
    Low Bitrate
    Join Date
    Jan 2005
    Location
    Richmond, VA
    Posts
    95
    Quote Originally Posted by Mickz View Post
    The “on pulse” time is programmable in the M4.
    Does it eventually release the line back to an open state?
    There may be a quick workaround you could try if it does, and all else fails.
    Hmm, I just probed it and the voltage does drop fairly quickly, but I think the main problem is that for some reason if you connect a multimeter on the on/off headers, the resistance is 10 ohms at all times. So whenever I connect this to the computer, the computer thinks the on/off headers are constantly shorted.

  3. #223
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    879
    Resistance should be very high at the M4 and depending on the MB around 10k ohm as the cap across the input charges with the multimeter. Thats measured with the MB and wih the M4 unpowered.

  4. #224
    Low Bitrate
    Join Date
    Jan 2005
    Location
    Richmond, VA
    Posts
    95
    Quote Originally Posted by Mickz View Post
    Resistance should be very high at the M4 and depending on the MB around 10k ohm as the cap across the input charges with the multimeter. Thats measured with the MB and wih the M4 unpowered.
    Yes, I know. No matter what I try, I always get the "turn on for 3 seconds, computer fan turns on, led turns on, then just shuts off." What do you suggest I do? Its severely halting my carpc project.

  5. #225
    Newbie
    Join Date
    Oct 2010
    Posts
    6
    I have the same problems as you guys. I have 2 M4-ATX power supplies and i will try to narrow down the problem so if anyone can help us. Both of the units, if you connect the multimeter to the on/off pins of the power supply and you give power on the IGN then you can hear a beep on the multimeter for about half a second which means everything works normal. I have 2 motherboards. A new one and an older one. Everything applies to both power supplies. The new motherboard fires up just fine but the older one seems not to get the on/off pulse at all although i know that it should. If i short the motherboard pins myself the pc fires up fine. So i connected a relay and let 12 volt current to pass through the power supply's on/off pins to arm the relay and guess what. The relay armed but it stayed armed forever. While the psu was on i disconnected the power line from the relay and connected it back right away and the relay didn't arm again! So as you see i managed to reproduce the other problem, where on some motherboards the psu holds the on/off switch until the pc shuts down after 4 seconds.

    Now after long time and emails, i l found out from the man than built the M4-ATX that the unit uses a 1 bit bus switch which has an internal resistance of 5ohm, to turn on the motherboard and the max current is 50mA. I don't know what all that means, but i hope that someone in this forum is and he will help us. Maybe with a specific relay we all will manage to power up our car pc's.

  6. #226
    Low Bitrate
    Join Date
    Jan 2005
    Location
    Richmond, VA
    Posts
    95
    Quote Originally Posted by valantis544 View Post
    I have the same problems as you guys. I have 2 M4-ATX power supplies and i will try to narrow down the problem so if anyone can help us. Both of the units, if you connect the multimeter to the on/off pins of the power supply and you give power on the IGN then you can hear a beep on the multimeter for about half a second which means everything works normal. I have 2 motherboards. A new one and an older one. Everything applies to both power supplies. The new motherboard fires up just fine but the older one seems not to get the on/off pulse at all although i know that it should. If i short the motherboard pins myself the pc fires up fine. So i connected a relay and let 12 volt current to pass through the power supply's on/off pins to arm the relay and guess what. The relay armed but it stayed armed forever. While the psu was on i disconnected the power line from the relay and connected it back right away and the relay didn't arm again! So as you see i managed to reproduce the other problem, where on some motherboards the psu holds the on/off switch until the pc shuts down after 4 seconds.

    Now after long time and emails, i l found out from the man than built the M4-ATX that the unit uses a 1 bit bus switch which has an internal resistance of 5ohm, to turn on the motherboard and the max current is 50mA. I don't know what all that means, but i hope that someone in this forum is and he will help us. Maybe with a specific relay we all will manage to power up our car pc's.
    Yours seems to be a timing problem, which can easily be resolved. I believe you can program that timing variable via usb interface. At least you are lucky enough to hear the beep on the multimeter for about a second. If I do the same thing of what you just did, and provide ignition, I will hear a beep (from the on/off headers) the whole time while the ignition is on. Its just driving me crazy.

    Oh btw, is it possible for you to give the contact info of the guy who made the m4-atx?

  7. #227
    Newbie
    Join Date
    Oct 2010
    Posts
    6
    Quote Originally Posted by kasemodz View Post
    Yours seems to be a timing problem, which can easily be resolved. I believe you can program that timing variable via usb interface. At least you are lucky enough to hear the beep on the multimeter for about a second. If I do the same thing of what you just did, and provide ignition, I will hear a beep (from the on/off headers) the whole time while the ignition is on. Its just driving me crazy.

    Oh btw, is it possible for you to give the contact info of the guy who made the m4-atx?
    I have allready sent an email and asked him if he can join this thread to give some answers, so lets just wait and see if there will be an answer.

  8. #228
    Low Bitrate
    Join Date
    Jan 2005
    Location
    Richmond, VA
    Posts
    95
    Quote Originally Posted by valantis544 View Post
    I have allready sent an email and asked him if he can join this thread to give some answers, so lets just wait and see if there will be an answer.
    Can you do me a favor? Can you turn on your m4, do not connect the ignition line, stick the two multimeter probes to the on/off header pins on the m4, and tell me if it keeps beeping, or doesn't beep, etc. Then, connect the ignition line and tell me if it stops beeping momentarily, etc. I'm trying to debug my m4, so if you can, I will really appreciate it, thanks.

  9. #229
    Newbie
    Join Date
    Oct 2010
    Posts
    6
    Quote Originally Posted by kasemodz View Post
    Can you do me a favor? Can you turn on your m4, do not connect the ignition line, stick the two multimeter probes to the on/off header pins on the m4, and tell me if it keeps beeping, or doesn't beep, etc. Then, connect the ignition line and tell me if it stops beeping momentarily, etc. I'm trying to debug my m4, so if you can, I will really appreciate it, thanks.
    I put the mode on the p0 which is the only mode i think the m4 goes on without ignition and i gave power to the main line. The psu turned on and gave me a short beep as it should. After that i connected the ignition line but there was no beep.

  10. #230
    Newbie
    Join Date
    Oct 2010
    Posts
    6
    Quote Originally Posted by kasemodz View Post
    Yours seems to be a timing problem, which can easily be resolved. I believe you can program that timing variable via usb interface. At least you are lucky enough to hear the beep on the multimeter for about a second. If I do the same thing of what you just did, and provide ignition, I will hear a beep (from the on/off headers) the whole time while the ignition is on. Its just driving me crazy.

    Oh btw, is it possible for you to give the contact info of the guy who made the m4-atx?
    I tried 700ms on the on/off pulse delay and then 1000 and then 2000 and nothing happened. Then i tried 1500ms and the pc now works!!! Pc powers on and off. I hope it stays that way.
    Now i am trying to solve the problem with the amp remote. One psu is turning on the amps right after the psu goes on and turns them off about one minute after i cut the ignition line but thats ok for now because that pc doesnt produce a pop from the speakers. The other psu turns on the amps only in p0 mode and thats a problem because the pop is so loud that i think it will destroy the speakers and my ears so i have a little switch for now to turn on the amps myself.

Similar Threads

  1. M4 ATX USB connection
    By Arby in forum M4-ATX
    Replies: 24
    Last Post: 08-10-2009, 10:24 PM
  2. M4 ATX Turn On Problem
    By Fox_Mulder in forum Power Supplies
    Replies: 26
    Last Post: 12-31-2008, 08:43 AM
  3. miniITX power supply for ATX motherboard?
    By uldics in forum Power Supplies
    Replies: 4
    Last Post: 09-26-2007, 01:17 PM
  4. Replies: 13
    Last Post: 07-19-2007, 02:57 PM
  5. morex 80wpsu and reg ATX cable dilema!!
    By surfy in forum Power Supplies
    Replies: 1
    Last Post: 08-16-2005, 09:06 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •