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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Computer power supply compatiility
I had a Soyo computer which didn't work: All it did was turn on, light up
a few lights on the CD-ROM, start the fan whirring and I got some very minor clicking. Nothing whatsoever got transmitted from the computer to the monitor which would stop the light on the monitor from flashing as if there was nothing connected Soyo eventually told me that the mobo was probably at fault so I replaced it with an Asus P3V133 which I am now using with the 450 Mhz Pentium 11. Which (when I THINK I got all the processor and voltages/bus speeds and multiples correct) does exactly the same thing So I am wondering if it might actually be a problem with the power supply, a problem Soyo didn't consider. So I bought a Compaq one for a munificent $3 at a local flea market. Does anyone know if all ATX power supplies will work with Asus mobos? I found out (not the hard way) that apparently all Dell ones are different and if you plug a Dell one (which helpfully has exactly the same ATX plug) into a non-Dell mobo, it may well fry the circuits. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it and when I tried testing the voltages to see if they went with the voltages cleverly set out in the ASUS manual, nothing is measured: Apparently unless you plug it in to place a load on it (the fan doesnt even go on when you plug the power supply into the mains) "Brothers and Sisters Have I None But That Man's Father is My Father's Son" |
#2
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Computer power supply compatiility
Does anyone know if all ATX power supplies will work with Asus mobos?
As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart |
#3
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Computer power supply compatiility
Well having bought it I kinda wanted to know if it would work rather than
having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) "LASERandDVDfan" wrote in message ... Does anyone know if all ATX power supplies will work with Asus mobos? As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart |
#4
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Computer power supply compatiility
"My father's son" wrote in
: Well having bought it I kinda wanted to know if it would work rather than having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) I'm fairly positive that Compaq power supplies ARE standard in regards to their power output. The only problem I've experienced regarding Compaq power supplies is that a standard ATX power supply will not mount correctly in a Compaq case. Aside from the mounting problem, however, a standard ATX power supply will power a Compaq motherboard just fine. Given that, I assume the two are giving the same output, unless Compaq has made their motherboards compatible with a proprietary power supply and the standard power supplies, which I doubt. |
#5
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Computer power supply compatiility
On Mon, 29 Dec 2003 00:40:10 -0500, "My father's son"
wrote: Well having bought it I kinda wanted to know if it would work rather than having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) "LASERandDVDfan" wrote in message ... Does anyone know if all ATX power supplies will work with Asus mobos? As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart If it is a true ATX power supply (monolithic plug), the power switch on the front of the case plugs into the motherboard which sends a power up (and then a supply good signal) to the power supply. The rocker switch on the back turns off power to the PSU and thus to the whole computer. Your motherboard (Asus P3V133) has this connector in the 6th and 7th position (from the ISA slot) of the panel connection closest to the edge of the board. If you want to test your PSU without a motherboard, you should connect pin 7 to 6 ( green and black ). eg: H --------------------------------- |O|O|O|X|X|O|O|O|O|O| u -- -- u u -- -- u u -- --------------------------------- |O|O|O|O|O|O|O|O|O|O| -- u u -- u u -- -- -- u The H is the clip for the plug, the u's mark the rounded pins on the connector. I have tried this and it does work. Here is a URL for this: http://modtown.co.uk/mt/article2.php?id=psumod Rocky -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#6
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Computer power supply compatiility
Thanks guys: That pretty much answers my questions although I wish someone
would have given me that advice before I changed the mobo if there IS something wrong with the original Soyo power supply and I neednt have gone to the bother of changing boards and figuring out all the connections, - which arent (exactly) the same on the Asus as on the Soyo. But I dont suppose the differences matter, - they all seem to involve connecting peripherals such as additional fans which are already internal to the power supply. And, yes, I WAS determined not to buy an ATX power supply which had one of those connectors to the power switch on the front panel (so that all I have to figure out is how to connect the 'jumper' to the pins on the mobo) "Rocky" wrote in message news On Mon, 29 Dec 2003 00:40:10 -0500, "My father's son" wrote: Well having bought it I kinda wanted to know if it would work rather than having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) "LASERandDVDfan" wrote in message ... Does anyone know if all ATX power supplies will work with Asus mobos? As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart If it is a true ATX power supply (monolithic plug), the power switch on the front of the case plugs into the motherboard which sends a power up (and then a supply good signal) to the power supply. The rocker switch on the back turns off power to the PSU and thus to the whole computer. Your motherboard (Asus P3V133) has this connector in the 6th and 7th position (from the ISA slot) of the panel connection closest to the edge of the board. If you want to test your PSU without a motherboard, you should connect pin 7 to 6 ( green and black ). eg: H --------------------------------- |O|O|O|X|X|O|O|O|O|O| u -- -- u u -- -- u u -- --------------------------------- |O|O|O|O|O|O|O|O|O|O| -- u u -- u u -- -- -- u The H is the clip for the plug, the u's mark the rounded pins on the connector. I have tried this and it does work. Here is a URL for this: http://modtown.co.uk/mt/article2.php?id=psumod Rocky -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#7
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Computer power supply compatiility
Uh-oh
Things not looking all that promising: none of the colours on the Compaq PS are the same as on the Soyo PS (on which the black and green ARE the same as on the http://modtown.co.uk/mt/article2.php?id=psumod site) On the Compaq those two pins are black and white (which is I suppose a 50% correct rate?) I suppose I had better both test the Soyo PS to see if the voltages match the Asus motherboard values when jumpered (ie if it is genuinely non- working) AND if the Compaq voltages are in fact the same despite all the colours being different when I jumper those two same pins? (a bit unlikely?) Then as a last resort I can cut off the plug from th eSoyo and find an ATX with those colours in all the same positions "Rocky" wrote in message news On Mon, 29 Dec 2003 00:40:10 -0500, "My father's son" wrote: Well having bought it I kinda wanted to know if it would work rather than having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) "LASERandDVDfan" wrote in message ... Does anyone know if all ATX power supplies will work with Asus mobos? As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart If it is a true ATX power supply (monolithic plug), the power switch on the front of the case plugs into the motherboard which sends a power up (and then a supply good signal) to the power supply. The rocker switch on the back turns off power to the PSU and thus to the whole computer. Your motherboard (Asus P3V133) has this connector in the 6th and 7th position (from the ISA slot) of the panel connection closest to the edge of the board. If you want to test your PSU without a motherboard, you should connect pin 7 to 6 ( green and black ). eg: H --------------------------------- |O|O|O|X|X|O|O|O|O|O| u -- -- u u -- -- u u -- --------------------------------- |O|O|O|O|O|O|O|O|O|O| -- u u -- u u -- -- -- u The H is the clip for the plug, the u's mark the rounded pins on the connector. I have tried this and it does work. Here is a URL for this: http://modtown.co.uk/mt/article2.php?id=psumod Rocky -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#8
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Computer power supply compatiility
Hey, look at it this way: you already have the makings of a second computer.
Buy a new case with power supply. Use the p.s. to swap-test your old one; then buy new drives/memory/cpu and you've got two computers...or sell the m.b./p.s. combo as a 'barebones' kit. If your old p.s. is bad, use the new one or replace it. A case w/p.s. doesn't cost all that much more than a p.s. alone. jak "My father's son" wrote in message ... Thanks guys: That pretty much answers my questions although I wish someone would have given me that advice before I changed the mobo if there IS something wrong with the original Soyo power supply and I neednt have gone to the bother of changing boards and figuring out all the connections, - which arent (exactly) the same on the Asus as on the Soyo. But I dont suppose the differences matter, - they all seem to involve connecting peripherals such as additional fans which are already internal to the power supply. And, yes, I WAS determined not to buy an ATX power supply which had one of those connectors to the power switch on the front panel (so that all I have to figure out is how to connect the 'jumper' to the pins on the mobo) "Rocky" wrote in message news On Mon, 29 Dec 2003 00:40:10 -0500, "My father's son" wrote: Well having bought it I kinda wanted to know if it would work rather than having to buy another which might well be the same (but at 83 times the price): Do you KNOW htat Compaq s are non-standard ATXs? (It IS A rocker switch on the back of the power supply module itself) "LASERandDVDfan" wrote in message ... Does anyone know if all ATX power supplies will work with Asus mobos? As long as it is a standard ATX supply with the correct pinouts for the ATX feed plug, it will work. Asus and Soyo makes stuff that conforms to the industry standard, while Dell is far more proprietary than that. (One of the many reasons why I opted to build my own computer rather than buy one from Dell or Compaq.) Whether or not it will work reliably is a different story. Go get a new standard ATX power supply and try it out. If it doesn't work, you can always return it to the place of purchase. Unlike the original Soyo power supply the Compaq doesnt have a power switch on it And what kind of power switch are you talking about? A rocker switch on the back of the power supply module itself or a long black cord with a locking pushbutton switch on it? If it's a rocker swtich on the back of the module itself, then that's likely to be okay. Some ATX power supplies have this switch and others don't. If it's the latter, then are you sure it's ATX? - Reinhart If it is a true ATX power supply (monolithic plug), the power switch on the front of the case plugs into the motherboard which sends a power up (and then a supply good signal) to the power supply. The rocker switch on the back turns off power to the PSU and thus to the whole computer. Your motherboard (Asus P3V133) has this connector in the 6th and 7th position (from the ISA slot) of the panel connection closest to the edge of the board. If you want to test your PSU without a motherboard, you should connect pin 7 to 6 ( green and black ). eg: H --------------------------------- |O|O|O|X|X|O|O|O|O|O| u -- -- u u -- -- u u -- --------------------------------- |O|O|O|O|O|O|O|O|O|O| -- u u -- u u -- -- -- u The H is the clip for the plug, the u's mark the rounded pins on the connector. I have tried this and it does work. Here is a URL for this: http://modtown.co.uk/mt/article2.php?id=psumod Rocky -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#9
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Computer power supply compatiility
On Mon, 29 Dec 2003 15:48:48 -0600, jakdedert wrote:
Hey, look at it this way: you already have the makings of a second computer. Buy a new case with power supply. Use the p.s. to swap-test your old one; then buy new drives/memory/cpu and you've got two computers...or sell the m.b./p.s. combo as a 'barebones' kit. If your old p.s. is bad, use the new one or replace it. A case w/p.s. doesn't cost all that much more than a p.s. alone. The problem is that case/p.s. combinations almost invariably have a power supply that is a complete piece of ****. They might have triacs rated for an output of 450W, but they die all the time with less than a 200W load. Given the choice between a $39 case/P.S. (with an $8 power supply included) and a $39 power supply, I'll take the latter. |
#10
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Computer power supply compatiility
"My father's son" wrote in message ...
if there IS something wrong with the original Soyo power supply and I neednt have gone to the bother of changing boards and figuring out all the connections, - which arent (exactly) the same on the Asus as on the Soyo. Soyo PSUs are made by Key Mouse, www.kmepc.com, and aren't the very worst you can get, although mine caused a lot of radio inteference because it didn't contain a line filter, contrary to what the website said. My 300W managed 300W and also met its 190W combined +3.3V and +5V rating, at least for ten minutes (limit of my test). To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Compaq PSUs are supposed to be really good and made by Newton or somebody. |
#11
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Computer power supply compatiility
Yes, I was able to test the Soyo PS with this method but cannot interpret
the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. Does this mean that the power supply has failed or might it be OK when under load? Put another way, when power supplies go bad, do they TEND to go out in toto or can this type of behaviour be indicative of a PS which has in practice failed? The COmpaq has completely different pin colours and voltages despite having the same type of plug going into the MoBo. Otherwise I wish I could make another computer with a lousy 233 Pentium 1 Dimension I have here which works, a good Soyo Pentium 11 MoBo, numerous good hard drives and only a need for a Pentium 11 processor. But as it is, none of the parts work together in the first computer (not to mention any potential second one) "larrymoencurly" wrote in message om... "My father's son" wrote in message ... if there IS something wrong with the original Soyo power supply and I neednt have gone to the bother of changing boards and figuring out all the connections, - which arent (exactly) the same on the Asus as on the Soyo. Soyo PSUs are made by Key Mouse, www.kmepc.com, and aren't the very worst you can get, although mine caused a lot of radio inteference because it didn't contain a line filter, contrary to what the website said. My 300W managed 300W and also met its 190W combined +3.3V and +5V rating, at least for ten minutes (limit of my test). To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Compaq PSUs are supposed to be really good and made by Newton or somebody. |
#12
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Computer power supply compatiility
"My father's son" wrote in message ...
To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Yes, I was able to test the Soyo PS with this method but cannot interpret the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. I've found that the voltages will often be out of tolerance when a PSU is tested without the mobo because some PSUs need rails to be loaded with at least 1 amp, and I have a PSU that needs far more than that and when loaded with just a 466 MHz Celeron the +12V rail will be so low that the HD won't even spin. The Key Mouse website once listed a minimum current of 5A for the +5V rail of one of its PSUs. It's possible that the +5V wire that measures at only +3V is actually a signal line, like the Power-On signal (grey on standard ATX PSUs). One way to find out is by connecting it to a known good +5V wire through a 1K-2K resistor (do NOT connect it directly to +5V!!!), and if it increases to +5V then you know it's a signal output rather than a voltage supply line. Have you tried www.support.compaq.com to find the Compaq's pin specifications? Unfortunately it doesn't seem to be nearly as easy to use as Gateway's online help. |
#13
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Computer power supply compatiility
The Compaq really isnt in contention at the moment
Its purchase was probably a misake and it was probably intended for some old workstation but coincidentally has the same plug to a motherbaord. I think you are right about the PS There probably isnt a lot wrong with it as it CAN give the correct voltages so i assume it can give them under proper circumstnaces and through the proper pinouts But I have now excluded the mobo, the memory, the PS, the processor and the video card This is getting really baffling and the guys at the ASUS boards couldn't asssit in telling me what jumper settings I might have got wrong. But it also raises the possiblity that the SOyo mobo wasnt broken in any way and it didnt have any particualr jumper settings Baffled "larrymoencurly" wrote in message om... "My father's son" wrote in message ... To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Yes, I was able to test the Soyo PS with this method but cannot interpret the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. I've found that the voltages will often be out of tolerance when a PSU is tested without the mobo because some PSUs need rails to be loaded with at least 1 amp, and I have a PSU that needs far more than that and when loaded with just a 466 MHz Celeron the +12V rail will be so low that the HD won't even spin. The Key Mouse website once listed a minimum current of 5A for the +5V rail of one of its PSUs. It's possible that the +5V wire that measures at only +3V is actually a signal line, like the Power-On signal (grey on standard ATX PSUs). One way to find out is by connecting it to a known good +5V wire through a 1K-2K resistor (do NOT connect it directly to +5V!!!), and if it increases to +5V then you know it's a signal output rather than a voltage supply line. Have you tried www.support.compaq.com to find the Compaq's pin specifications? Unfortunately it doesn't seem to be nearly as easy to use as Gateway's online help. |
#14
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Computer power supply compatiility
Start at the beginning: mobo and p.s. hooked up with only processor
installed. Listen for beeps. If you get them, add in memory--beeps again, add video card...and so on until the process fails. That's where your problem lies. jak "My father's son" wrote in message ... The Compaq really isnt in contention at the moment Its purchase was probably a misake and it was probably intended for some old workstation but coincidentally has the same plug to a motherbaord. I think you are right about the PS There probably isnt a lot wrong with it as it CAN give the correct voltages so i assume it can give them under proper circumstnaces and through the proper pinouts But I have now excluded the mobo, the memory, the PS, the processor and the video card This is getting really baffling and the guys at the ASUS boards couldn't asssit in telling me what jumper settings I might have got wrong. But it also raises the possiblity that the SOyo mobo wasnt broken in any way and it didnt have any particualr jumper settings Baffled "larrymoencurly" wrote in message om... "My father's son" wrote in message ... To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Yes, I was able to test the Soyo PS with this method but cannot interpret the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. I've found that the voltages will often be out of tolerance when a PSU is tested without the mobo because some PSUs need rails to be loaded with at least 1 amp, and I have a PSU that needs far more than that and when loaded with just a 466 MHz Celeron the +12V rail will be so low that the HD won't even spin. The Key Mouse website once listed a minimum current of 5A for the +5V rail of one of its PSUs. It's possible that the +5V wire that measures at only +3V is actually a signal line, like the Power-On signal (grey on standard ATX PSUs). One way to find out is by connecting it to a known good +5V wire through a 1K-2K resistor (do NOT connect it directly to +5V!!!), and if it increases to +5V then you know it's a signal output rather than a voltage supply line. Have you tried www.support.compaq.com to find the Compaq's pin specifications? Unfortunately it doesn't seem to be nearly as easy to use as Gateway's online help. |
#15
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Computer power supply compatiility
Unforunately it isnt that easy: I tried that and dont get any beeps at all
under any circumstances. (But I cant figure out if that is because the contact to the speaker is loose or not) "jakdedert" wrote in message .. . Start at the beginning: mobo and p.s. hooked up with only processor installed. Listen for beeps. If you get them, add in memory--beeps again, add video card...and so on until the process fails. That's where your problem lies. jak "My father's son" wrote in message ... The Compaq really isnt in contention at the moment Its purchase was probably a misake and it was probably intended for some old workstation but coincidentally has the same plug to a motherbaord. I think you are right about the PS There probably isnt a lot wrong with it as it CAN give the correct voltages so i assume it can give them under proper circumstnaces and through the proper pinouts But I have now excluded the mobo, the memory, the PS, the processor and the video card This is getting really baffling and the guys at the ASUS boards couldn't asssit in telling me what jumper settings I might have got wrong. But it also raises the possiblity that the SOyo mobo wasnt broken in any way and it didnt have any particualr jumper settings Baffled "larrymoencurly" wrote in message om... "My father's son" wrote in message ... To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Yes, I was able to test the Soyo PS with this method but cannot interpret the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. I've found that the voltages will often be out of tolerance when a PSU is tested without the mobo because some PSUs need rails to be loaded with at least 1 amp, and I have a PSU that needs far more than that and when loaded with just a 466 MHz Celeron the +12V rail will be so low that the HD won't even spin. The Key Mouse website once listed a minimum current of 5A for the +5V rail of one of its PSUs. It's possible that the +5V wire that measures at only +3V is actually a signal line, like the Power-On signal (grey on standard ATX PSUs). One way to find out is by connecting it to a known good +5V wire through a 1K-2K resistor (do NOT connect it directly to +5V!!!), and if it increases to +5V then you know it's a signal output rather than a voltage supply line. Have you tried www.support.compaq.com to find the Compaq's pin specifications? Unfortunately it doesn't seem to be nearly as easy to use as Gateway's online help. |
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Computer power supply compatiility
jakdedert wrote:
Start at the beginning: mobo and p.s. hooked up with only processor installed. Listen for beeps. If you get them, add in memory--beeps again, add video card...and so on until the process fails. That's where your problem lies. jak "My father's son" wrote in message ... The Compaq really isnt in contention at the moment Its purchase was probably a misake and it was probably intended for some old workstation but coincidentally has the same plug to a motherbaord. I think you are right about the PS There probably isnt a lot wrong with it as it CAN give the correct voltages so i assume it can give them under proper circumstnaces and through the proper pinouts But I have now excluded the mobo, the memory, the PS, the processor and the video card This is getting really baffling and the guys at the ASUS boards couldn't asssit in telling me what jumper settings I might have got wrong. But it also raises the possiblity that the SOyo mobo wasnt broken in any way and it didnt have any particualr jumper settings Baffled "larrymoencurly" wrote in message om... "My father's son" wrote in message ... To turn on a PSU without a mobo, connect its pin 14 (green wire, Power On) to a black wire, like pin 13 or 15 next to it. Some PSUs also need a load of 20 ohms or less (use 10 watt resistor -- could get hot otherwise) between red and black wires for the +5V. Yes, I was able to test the Soyo PS with this method but cannot interpret the results: The PS DOES seem able to give out 3.3 volts, 5 volts and 12 volts. But some (one?) of the pins which should give out 12 volts only gives out 10 and a 5 volt one only gives out 3 volts. I've found that the voltages will often be out of tolerance when a PSU is tested without the mobo because some PSUs need rails to be loaded with at least 1 amp, and I have a PSU that needs far more than that and when loaded with just a 466 MHz Celeron the +12V rail will be so low that the HD won't even spin. The Key Mouse website once listed a minimum current of 5A for the +5V rail of one of its PSUs. It's possible that the +5V wire that measures at only +3V is actually a signal line, like the Power-On signal (grey on standard ATX PSUs). One way to find out is by connecting it to a known good +5V wire through a 1K-2K resistor (do NOT connect it directly to +5V!!!), and if it increases to +5V then you know it's a signal output rather than a voltage supply line. Have you tried www.support.compaq.com to find the Compaq's pin specifications? Unfortunately it doesn't seem to be nearly as easy to use as Gateway's online help. you forgot to mention to hook up the small speaker to the mobo, otherwise you may not hear a diagnostic beep sequence |
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