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presario 4764 power supply start up ?



 
 
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  #11  
Old November 26th 03, 07:16 PM
DEJ57
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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  
Old November 27th 03, 09:39 PM
Kevin Childers
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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.

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  #13  
Old November 28th 03, 05:03 AM
Kevin Falconer
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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  
Old November 28th 03, 05:20 AM
Kevin Falconer
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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  
Old November 28th 03, 05:52 PM
Kevin Childers
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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  
Old November 28th 03, 08:47 PM
BFriedl
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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  
Old November 30th 03, 12:42 AM
Kevin Falconer
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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  
Old December 1st 03, 02:07 AM
Kevin Childers
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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  
Old December 4th 03, 03:03 AM
Kevin Falconer
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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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