Re-Cap and No Post

**MisterGank** · 05-23-2006, 02:49 PM

Re: Re-Cap and No Post

Oh, and yes, I've tried 3 power supplies... and none of them can get it power up...

**tiresias** · 05-23-2006, 04:06 PM

Re: Re-Cap and No Post

Welcome MisterGank

First thing you'll want to do is to try to narrow down the problem a little. There's a few things you can investigate to gain some insight into where the problem actually lies - often it can be an easy-to-fix issue which you may have overlooked.

1. With the PSU attached and powered up, is there a 5Vsb at the ATX connector?

2. Can you measure any potential between the two pins on the motherboard leading to the system 'on' front panel button?

3. Short these two pins for a second or so - have the PSU's other output "appeared" at the ATX connector now?

These are just three extremely simple initial steps, and yet you'd be surprised how often a seemingly "dead" motherboard turns out to be the result of a loose wire leading to the chassis' power button!

Let us know.

PS. Have you tried starting up the motherboard outside the chassis? With only CPU's installed but no RAM, cards, or anything else (it should at least beep).

**Rainbow** · 05-23-2006, 04:07 PM

Re: Re-Cap and No Post

Have you checked board traces for damage? Mainly around the replaced caps but also near CPU sockets.

**MisterGank** · 05-23-2006, 06:20 PM

Re: Re-Cap and No Post

Right now there is no board trace damage. I tested the 5v and they were not active. Both acted as a ground... I had my father-in-law look over it, he did soldering boards for a job once. He said there were a few bad joints, and he suggested just to re-do them all just to be sure. I'm going to do that tomorrow night. I'll update then and let you know if it posts...

**MisterGank** · 05-24-2006, 09:09 PM

Re: Re-Cap and No Post

I de-soldered every cap, and re-soldered them all, they are all shiney and look perfect now. I ran through with Ohm meter again, and all check out. With power supply on, I still get nothing. With power supply on I flipped the board over, and wanted to test the 5v from supply to see if it was going to any caps with board off. None of the caps have power. Is this normal?

As for the terminals for the power switch, both are a ground... Neither have a 5v to them...

I then tested the green wire from PS (PS says this is the "PS-ON" & "REMOTE") to make sure 5v was coming from the unit with my voltage meter, and it stuttered and all four sys fans flickered on for a sec. I tried it again, and I can not replicate what I did. If the board is not turning on, is there a way to "hot wire" the power supply to kick on so that I can even see if my board will post? Would this NOT be suggested?

Anybody have any ways of testing other than what I have stated?

**triplelatte** · 05-24-2006, 10:27 PM

Re: Re-Cap and No Post

You could try a ATX power supply tester. You can find them cheap a most comp stores. Also check your ATX connector on your Mobo to make sure no gunk or something is in there. check all wires on the PSU for breaks as a hidden bad wire can make you want to drink and check your caps in the PSU since its all apart anyhow.

**MisterGank** · 05-24-2006, 11:50 PM

Re: Re-Cap and No Post

I've got 4 power supplies, tested all on other boards... PS is ok...

**Per Hansson** · 05-26-2006, 03:06 AM

Re: Re-Cap and No Post

If you ground Pin14 on the ATX connector the powersupply will turn on

If you can not start the powersupply this way (with it connected to the mainboard but alone is fine) then you probably have a short somewhere

**kevthegerbil** · 06-15-2006, 03:46 PM

Re: Re-Cap and No Post

Have you fitted them the right way in ???? AMD M/B sometimes will not work again the faulty caps damage the north or south bridge ics & the AMD cpu????

**tazwegion** · 06-21-2006, 08:26 PM

Re: Re-Cap and No Post

I've purchased motherboards before (both used & new) that behaved in a similar manner, quite simply all they needed was a reset BIOS

BTW I don't think the board will POST without RAM in the first memory slot, additionally in some unfortunate cases... too much heat during cap extraction/soldering can damage surrounding components

**arneson** · 06-21-2006, 09:11 PM

Re: Re-Cap and No Post

Taz is right, I also have a board that needs a special keyboard hold to tell it not to monitor the cpu fan, otherwise it does nothing.

**davmax** · 06-23-2006, 01:07 AM

Re: Re-Cap and No Post

If 5 volts does not appear this is very often due to a short circuit, the power supply self protects and will not start. If the board had 5 Volt before you recapped the most likely suspect is that one or more of the cap soldered joints that is surrounded by the earth plane is shorted. Look very carefull with a magnifying glass and make sure each cap has a small insulating ring around one terminal ( for the major VRM caps usually). Very difficult to check this with an ohmeter, the resistances are too low in the circuitry.

Re-capping the motherboard is not enough. The power supply caps must be checked and if necessary replaced. Often faulty PS caps can take out Mb caps.

Hope this is helpful.

**MisterGank** · 06-28-2006, 03:24 PM

Re: Re-Cap and No Post

Oh well... board, CPUs and HeatSinks going up for sale... I got a new board, CPU, and ram...

Re-Cap and No Post

Re-Cap and No Post

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