Gateway 1995 P5 power supply specs

[vjp...@at.biostrategist.dot.dot.com]

It's under another (KVM'd) computer and I don't really have the space to
leave it open a week, so I'm trying to guess how/if to replace the power supply.

(how)

Amazon sells a cheap one as Apevia ATX-VS450W Venus 450W ATX It seems the
specs are GATEWAY POW0016A01 145 WATT POWER SUPPLY P5-75 P5-120 ASTEC
SA145-3435 and that (I guess) my main issue is the bus. The cheapest exact
match I've found sells for five times the one on Amazon. Is there such a
thing as a "universal" power supply?

(if)

Now, what seems to be wrong? I hadn't touche dth emachine all summer. THen it
went on but couldn't find the hard drive. Evetually after about ten times it
did. It worked daily for about ten days. I didn't use it for about a month,
after which it refuses to turn on. So I'm GUESSING it's the power supply.


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---{Nothing herein constitutes advice. Everything fully disclaimed.}---

[tabb...@gmail.com]

On Monday, 27 November 2017 21:42:28 UTC, vjp...@at.biostrategist.dot.dot.com wrote:
> It's under another (KVM'd) computer and I don't really have the space to
> leave it open a week, so I'm trying to guess how/if to replace the power supply.
>
> (how)
>
> Amazon sells a cheap one as Apevia ATX-VS450W Venus 450W ATX It seems the
> specs are GATEWAY POW0016A01 145 WATT POWER SUPPLY P5-75 P5-120 ASTEC
> SA145-3435 and that (I guess) my main issue is the bus. The cheapest exact
> match I've found sells for five times the one on Amazon. Is there such a
> thing as a "universal" power supply?
>
> (if)
>
> Now, what seems to be wrong? I hadn't touche dth emachine all summer. THen it
> went on but couldn't find the hard drive. Evetually after about ten times it
> did. It worked daily for about ten days. I didn't use it for about a month,
> after which it refuses to turn on. So I'm GUESSING it's the power supply.

probably bad caps in either PSU or on the mobo. A component tester could probably tell you their ESR.


NT

[jurb...@gmail.com]

They are standardized but Gateway doesn't use a standard one usually.

I agree on the caps.

Companies like Gateway skimp on the power and make the power supply smaller. Nothing else will fit. They will usually work but they would have to be outside the case. And some of them use the power supply fan to cool the microprocessor. That really stickies up the wicket.

The only thing you can't get usually is the transformer. But be careful if you have to replace the main chopper. Generally it will be a MOSFET and the ratings not really all that critical, but you need at least like a 700 volt part because they use a line doubler for 110 volts and simply turn it into a regular rectifier for 220 volt operation.

[mrob...@att.net]

vjp...@at.biostrategist.dot.dot.com wrote:
> Amazon sells a cheap one as Apevia ATX-VS450W Venus 450W ATX

A machine that old probably won't use an ATX supply; it will use an AT
supply. The main difference is in the connector(s) to the motherboard -
an AT supply has two or three 6-pin connectors (1 row x 6 pins), while
an ATX supply has one 20 or 24-pin connector (2 rows x 10 or 12 pins).
(And no, you can't cut up an ATX connector to make it fit on a
motherboard that expect an AT connector.)

Pretty much all AT supplies have two of those 6-pin connectors to
deliver +5, -5, +12, -12, and ground. Later AT supplies, approximately
once 3.3 V PCI happened, had a third 6-pin connector to deliver +3.3
and ground. I have a Gateway P5-100 of that same era that had the
motherboard connector for +3.3 V, but no corresponding plug on the
power supply; if you aren't running any PCI cards that need +3.3 V,
you don't *need* the +3.3 V connection. If you see an empty 6-pin
connector on the motherboard, that looks like the two connectors that
do have plugs from the power supply, then you don't need the +3.3 V.
(IIRC the +3.3 V connector is near the PCI slots, away from the other
two.)

The ATX supply will also have some other connectors that an AT supply
won't have, like +12 V for fancy video cards and +12/+5/+3.3 V for SATA
hard drives, but the motherboard connector is the main difference.

Newegg still sells a couple of AT supplies, one for $37 shipped
https://www.newegg.com/Product/Product.aspx?Item=N82E16817707002
and one for $60 shipped
https://www.newegg.com/Product/Product.aspx?Item=N82E16817103051
. The $37 one is rated 230 W, so it should replace your 145 W power
supply easily. It doesn't have the +3.3 V connector, though. The
+3.3 V status of the $60 one is unclear, but it's safest to assume
that it doesn't have it.

I looked at Micro Center, but they don't seem to stock AT power supplies
anymore. There probably is a store in NYC where you could buy one if
you want to have it today, but I don't know where that store is.

I don't get money or other consideration from any companies mentioned.

Matt Roberds

[vjp...@at.biostrategist.dot.dot.com]

Much obliged to all

[jurb...@gmail.com]

Quickest way to see if it is AT or ATX is that the AT type has a hard power switch, that is it actually turns off the AC going to the power supply. The ATX type has a soft power switch which connects to the motherboard.

[vjp...@at.biostrategist.dot.dot.com]

Funny outcome:

mention of capacitors made me think,
"What if I leave it on a long time?"

Indeed, After like six hours, it turned on (the GW2k P5).

I'm using it now to dialup to unix
Now, I'm afraid to shut it off.

What cause dit to "die" in the first place
was I hadn't used it in a long while

[Michael A Terrell]

Some of those old Gateway win 95 computers used the ATX connector,
with non standard wiring. A lot of angry people scrapped the computers,
because of the cheap, non standard power supplies. I picked up couple
truckloads of them where I worked, as they died.

[whit3rd]

On Sunday, December 3, 2017 at 9:06:13 PM UTC-8, vjp...@at.biostrategist.dot.dot.com wrote:
> Funny outcome:
>
> mention of capacitors made me think,
> "What if I leave it on a long time?"
>
> Indeed, After like six hours, it turned on (the GW2k P5).
>
> I'm using it now to dialup to unix
> Now, I'm afraid to shut it off.
>
> What cause dit to "die" in the first place
> was I hadn't used it in a long while

Yes, one sees this a lot on the (Apple II type) early switchmode supplies.
The startup sequencing is critically dependent on some part of the (presumably)
capacitor impedance, and good but stale-on-the-shelf capacitors make
the startup fail. You just hear tick...tick...

I've tried replacing the big output filter capacitors (usual culprits for high-ESR
failure mode) with no success, it's presumably NOT those, but one of
the 'minor' parts. And, in at least three cases, let it tick overnight, and
the next morning it's working. Will work for years. Use and enjoy.

[vjp...@at.biostrategist.dot.dot.com]

I don't want to jinx myself,
but it turns on every day since I left it on for
a few hours (and it finally revived) on Sunday.

[Percival P. Cassidy]

On 11/27/2017 04:42 PM, vjp...@at.BioStrategist.dot.dot.com wrote:
> It's under another (KVM'd) computer and I don't really have the space to
> leave it open a week, so I'm trying to guess how/if to replace the power supply.
>
> (how)
>
> Amazon sells a cheap one as Apevia ATX-VS450W Venus 450W ATX It seems the
> specs are GATEWAY POW0016A01 145 WATT POWER SUPPLY P5-75 P5-120 ASTEC
> SA145-3435 and that (I guess) my main issue is the bus. The cheapest exact
> match I've found sells for five times the one on Amazon. Is there such a
> thing as a "universal" power supply?
>
> (if)
>
> Now, what seems to be wrong? I hadn't touche dth emachine all summer. THen it
> went on but couldn't find the hard drive. Evetually after about ten times it
> did. It worked daily for about ten days. I didn't use it for about a month,
> after which it refuses to turn on. So I'm GUESSING it's the power supply.

As with many other brands of off-the-shelf computers, the power supply
may be non-standard in many different ways, including a non-standard
physical format and non-standard wiring. Other parts may be non-standard
as well.

That's why I build my own computers from standard parts.

Perce

[Ralph Mowery]

In article <ovi0ru$8qk$1...@reader2.panix.com>,
vjp...@at.BioStrategist.dot.dot.com says...

>
> It's under another (KVM'd) computer and I don't really have the space to
> leave it open a week, so I'm trying to guess how/if to replace the power supply.
>
> (how)
>
> Amazon sells a cheap one as Apevia ATX-VS450W Venus 450W ATX It seems the
> specs are GATEWAY POW0016A01 145 WATT POWER SUPPLY P5-75 P5-120 ASTEC
> SA145-3435 and that (I guess) my main issue is the bus. The cheapest exact
> match I've found sells for five times the one on Amazon. Is there such a
> thing as a "universal" power supply?
>
> (if)
>
> Now, what seems to be wrong? I hadn't touche dth emachine all summer. THen it
> went on but couldn't find the hard drive. Evetually after about ten times it
> did. It worked daily for about ten days. I didn't use it for about a month,
> after which it refuses to turn on. So I'm GUESSING it's the power supply.
>
>

A computer that old should be replaced with a used one off ebay unless
you need it to run some old programs. They can be had for about the
price of the power supply.

It may be the capacitors on the motherboard are bad. Look at them ,
especially around the processor. If they are not flat on top,but domed
shape, they are most likely bad. Sometimes if you can heat them up, it
will let the computer start up. Sure indication they are bad. lots of
computers around that time had a bad run of capacitors.