Re: After replacing bad capacitors, still nothing
I forgot to say that when testing the power supplies in a tower the only things plugged in were the 20 pin and the 4 pin plugs. Nothing else (harddrive, cd-rom, etc.) were attached. So, these won't power up even on a very light load (motherboard only).
thanks,
gkirby
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Last Activity: 12-18-2008, 08:34 PM
Joined: 09-08-2007
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Re: After replacing bad capacitors, still nothing
After getting away from these power supplies for a few days, I'm ready again to try to figure them out.
After replacing the bad capacitors in 23 Dell power supplies, they all are acting the same.
1. They will not power up a good tower.
2. When checked with a LED tester, all of them tested good.
3. While plugged into the mother board, I can momentarily jump from the green wire to a black and the processor fan starts running. (I then removed the jumper). Then fan continues to run, but the computer still...Leave a comment:
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Re: After replacing bad capacitors, still nothing
The motherboards I had been having problems with were in GX270's which are knows to have issues. When I get time, I'll try these power supplies in a GX260 which I know is in good working order. Thanks for all the help.
Gkirby
I NEVER WANT TO HEAR THE NAME GX270 AGAIN!!!!!!!!Leave a comment:
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Re: After replacing bad capacitors, still nothing
I received a Coolmax Deluxe ATX Power Supply tester today (LED model) and just finished testing the 21 Dell HP-P2507FWP power supplies which I have replaced swollen capacitors in. These ps's come with a 20 pin connector, and not a 24 pin. They ALL test exactly the same.
+3.3v
-12v
PG
+5VSB
+12v
-5v
+5v
All lights were green when testing all the power supplies except the -5v LED. The -5v led does not come on on any of them. What does the -5v control?? Do I have a problem...Leave a comment:
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Re: After replacing bad capacitors, still nothing
I just ordered a tester. Hopefully that will help when I get it in.
Thanks for all the help.
GeneLeave a comment:
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Re: After replacing bad capacitors, still nothing
O.K., I'm starting to pull my hair out.
I took a good power supply and tested it against two which would not power up the ps fan, computer, or processor fan.
I jumpered the green wire to a black ground to power up the ps's. All three power up. I tested all the pins and compared them, and they all had the same voltages on matching pins.
I then pulled the jumpers and check the green wire voltages. The good ps showed 3.3v on the green wire, the bad ps's showed 5v on this wire.
The ONLY difference I can...Leave a comment:
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Re: After replacing bad capacitors, still nothing
Thanks for all the help. I'm glad I found this forum. I've already learned a lot just reading everyone's posts.
Thanks again,
gkirbyLeave a comment:
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Re: After replacing bad capacitors, still nothing
These computers came from Austin-Peay University in Clarksville Tennessee. I bought them on Govdeal.net. I bought 1 lot of 5 GX260 towers, and 1 lot of 6 GX270 towers. When I went to pick them up the guy said that the gX260's were probably in good working order, but they would not have sold the GX270's unless there was a problem with them. I told him that they should have mentioned that on the auction. I'm not even sure that they know that they are covered by Dell, but I am going to tell them right now. I paid $130 each for these...Leave a comment:
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Re: After replacing bad capacitors, still nothing
The Rubycon's are black with a grey negative stripe. This 3300uf looks identical except that the stripe is silver.
Thanks,Leave a comment:
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Re: After replacing bad capacitors, still nothing
The 4700 uf is a Rubycon 4700uf@10v. PX and there is the number S0643
The 2200 is a Rubycon 2200uf@10v. MBZ T0543
The third one I got from Digi-Key. It is a 3300uf@10v the only thing I can find is: an M inside a square with rounded corners and CE NHG
I hope this helps,
Thanks,
GeneLeave a comment:
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Re: After replacing bad capacitors, still nothing
Do you mean what brand caps, or what size.
The sizes are:
1-4700uf@10v
1-3300uf@10v
1-2200uf@6.3vLeave a comment:
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Re: After replacing bad capacitors, still nothing
Do you mean what brand, or what size?
1-4700uf @10v
1-3300uf@10v
1-2200uf@6.3v\
thanks,Leave a comment:
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Re: After replacing bad capacitors, still nothing
I took a jumper wire and jumped the green and a black terminal on all of the power supplies and they all powered up. (I also attached a harddrive for a load). I put one of them in a tower and tried to power up the computer. The fans started slowly and I could hear the floppy drive clicking, but no boot. I checked the 5v/12v power, and it was only 8.6 volts/2.6volts. Not enough to power up the tower. After letting it run about 45 seconds, I heard a click and then the tower started booting up. When checking the power, I had 5v/12v....Leave a comment:
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After replacing bad capacitors, still nothing
I'm new to replacing capacitors, but the purchase of 30 Dell GX270 minitowers has made it necessary for me to try to learn. I have a few that have bad capacitors on the motherboard, but I have a bigger problem with the Power Supplies. I have opened up 12 of them that would not power up, and they all had swollen capacitors. After purchasing the correct capacitors I replaced all the swollen capacitors in the boards. They still will not power up. I paid a pretty good price for these towers and if I have to buy new power supplies I will come out in the hole. I know I did a good job replacing the capacitors,...
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