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#11
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Compaq also sold some systems (don't recall model
numbers) with AT power supplies, having a rocker switch on the back for the AC input and a switch on the front bezel but the switch on the front wasn't actually a power switch, was a sleep switch. My 4112 was like that, built in 1996. Dale |
#12
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Yes, but from the sound of it the original poster is referring to a AT,
not ATX board. On those, the fan is wired to the main power circuit and comes on when the power is turned on at the front of the machine. Later ATX models had the power managed through the board. KC "Sam Goldwasser" wrote in message ... kony writes: On 26 Nov 2003 08:30:12 -0500, Sam Goldwasser wrote: A corrupted CMOS may inhibit power on. It can prevent the system from POSTing, but without a viable BIOS, even without the EEPROM in the board it should still be able to pull the PSU power-on pin low, turn on the power supply so at least it's fan would be spinning and voltage levels obtainable. Apparently not. I had a Compaq system which played totally dead and resetting the CMOS fixed it. The question at this point might be, "Which fan isn't turning?". Apparently some Compaq systems do use logic for the CPU fan control, it may not spin but the power supply fan should still be on. Nothing, dead as a door stop. --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. |
#13
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1. Swap out CPU if possible.
not possible, soldered in 2. Unplug switch from MB and try shorting out the 2 pins on the MB which two pins ? 3. Go get a new computer got one, just trying to get this one going for company to use, games and such thanks for the comments.... Kevin |
#14
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Compaq also sold some systems (don't recall model
numbers) with AT power supplies, having a rocker switch on the back for the AC input and a switch on the front bezel but the switch on the front wasn't actually a power switch, was a sleep switch. My 4112 was like that, built in 1996. Dale Dale, this was a 1996 model computer, it does have the sleep mode. I'll crap if all along i was shipped a bad PSU from compaq, I may just take the PSU to have tested but i hate to pay dollars to test something i just paid good money for....with everything disconnected I've applied a load to 5v circuit and shorted the green to ground and nothing. There does seem to be some uncertainty though that the green is the turn on wire for this PSU. With nothing running though I do get some voltage on a purple wire ? bios has been cleared and battery is good..... Kevin |
#15
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Kevin,
If this board is the one I think you have the power supply doesn't need an outside test, simply plugging it in and flipping the toggle switch on and then clicking the hardwired case switch should be enough. With the fan connected to the main power circuit it should immediately begin running without any load at all, even with a dead board. You can call Compaq tech support to verify this, but I am very certain that if I understand you correctly this is the case. Actually I don't know of any AT form factor power supply that will not do this. The higher functions did not come out until the advent of the ATX motherboard and the newer poser supplies supported by it. The third connector was and early attempt to in corporate these improvements, but it still was built within certain AT form factor limitations. KC "Kevin Falconer" wrote in message m... Compaq also sold some systems (don't recall model numbers) with AT power supplies, having a rocker switch on the back for the AC input and a switch on the front bezel but the switch on the front wasn't actually a power switch, was a sleep switch. My 4112 was like that, built in 1996. Dale Dale, this was a 1996 model computer, it does have the sleep mode. I'll crap if all along i was shipped a bad PSU from compaq, I may just take the PSU to have tested but i hate to pay dollars to test something i just paid good money for....with everything disconnected I've applied a load to 5v circuit and shorted the green to ground and nothing. There does seem to be some uncertainty though that the green is the turn on wire for this PSU. With nothing running though I do get some voltage on a purple wire ? bios has been cleared and battery is good..... Kevin |
#16
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what are the specs on this system? Im guessing its an AT computer. Does
the power switch stay in when you press it or is it a momentary switch? If it stays in, then you have a AT which makes it easier. You can just plug in a hard drive (to give it load) and turn on the psu. If that doesnt work,then its either your hdd or the psu. Kevin Falconer wrote: 1. Swap out CPU if possible. not possible, soldered in 2. Unplug switch from MB and try shorting out the 2 pins on the MB which two pins ? 3. Go get a new computer got one, just trying to get this one going for company to use, games and such thanks for the comments.... Kevin -- BFriedl A+ Certified Technician AIM: UACybercat ** Bear Down Arizona! ** ******* Go Cats! ******* |
#17
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what are the specs on this system? Im guessing its an AT computer. Does
the power switch stay in when you press it or is it a momentary switch? If it stays in, then you have a AT which makes it easier. You can just plug in a hard drive (to give it load) and turn on the psu. If that doesnt work,then its either your hdd or the psu. bfriendl, the switch on front is just a momentary switch, it's a sleepmode switch. The PSU has a rocker switch on the back for on/off I think. I'll probably call compaq. I thought I ordered this from compaq but I think it was PC/finder ? but the PSU has compaq on it. I suppose I'll try compaq but they charge also for their tech info. If i knew for a fact this PSU did not require a turn on signal from the board I would just call the shipper and tell them I'm sending it back, but if it's good I'd just be wasting more time. The p1 and p2 connectors are like this ------ ------ then one other connector in the middle of board ------ the green wire I was told to jumper to ground is in the 6 pin connector in the center of the board, i think this is p9 connector Kevin |
#18
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"Kevin Falconer" wrote in message om... what are the specs on this system? Im guessing its an AT computer. Does the power switch stay in when you press it or is it a momentary switch? If it stays in, then you have a AT which makes it easier. You can just plug in a hard drive (to give it load) and turn on the psu. If that doesnt work,then its either your hdd or the psu. bfriendl, the switch on front is just a momentary switch, it's a sleepmode switch. The PSU has a rocker switch on the back for on/off I think. Actually it covers all three functions, on/off/sleep. Usually it must be held down for 4 seconds to turn off the system. A good thing if you have a button pushing two year old wandering through your work area. I'll probably call compaq. I thought I ordered this from compaq but I think it was PC/finder ? but the PSU has compaq on it. I suppose I'll try compaq but they charge also for their tech info. If i knew for a fact this PSU did not require a turn on signal from the board I would just call the shipper and tell them I'm sending it back, but if it's good I'd just be wasting more time. You can also try www.power-on.com they have had simular PSUs in the past. The p1 and p2 connectors are like this ------ ------ then one other connector in the middle of board ------ the green wire I was told to jumper to ground is in the 6 pin connector in the center of the board, i think this is p9 connector Make sure you have the two black leads on P1 & P2 side-by-side. The other connector is unique to only a few boards. It, I believe, is a control circuit allowing the basically AT board to perform some functions that later came out ass standard for ATX boards. KC |
#19
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Actually it covers all three functions, on/off/sleep. Usually it must
be held down for 4 seconds to turn off the system. A good thing if you have a button pushing two year old wandering through your work area. Thanks, the one thing i did not do is hold that front button in for anything longer than a quick push. I'll crap if i was just not holding this button in long enough to wake up the power supply, probably wishfull thinking, but i'll give it a try ! |
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