The Mother Board

jimmy-j · Posted: Tue May 13, 2008 2:03 pm Post subject:

Bad caps in other computer equipment:-
Belkin Wireless Cable/DSL Gateway Router Model # F5D6231-4 ver 1000

Gloria 1500uF 6.3V
Gloria 1000uF 6.3V

GeorgeCCarter · Pilgrim Joined: 08 Feb 2003 Posts: 2

Add to that the ASUS K8N8X-LA motherboard (a motherboard made for HP machines) specifically HP Pavallion A640N, also referred to as the Diablo UL6E.

jimmy-j · Posted: Thu May 15, 2008 1:32 pm Post subject:

Karlsweldt · Posted: Fri May 16, 2008 1:10 pm Post subject:

If properly manufactued, the mobo will have small icons where the capacitors are to go, to indicate the (+) or (-) terminals. Easier to see than tiny characters.
Per the design "flavor" of manufacturers, the labels may be different. But always look for those positive and negative symbols for orientation! If you found a unit that was installed backwards, likely it would have blown apart within a few minutes or seconds of getting power!
The safe rule concerning voltage is to stay at least 20% above circuit designs.
With audio output coupling capacitors, it is best to go with a 2x higher rating than circuit voltage.

It is safe and acceptable to replace a capacitor with one of a higher voltage rating.. but never lower! But always use the same capacitance value, unless additional filtering is needed on power circuits. The value of the capacitor is otherwise critical with timing circuits and DC isolation.
With AC capacitors, they are just two standard DC capacitors.. in series, but with two like terminals mated.. such as positive to positive. If voltage flows in reverse to the polarity, then a simulated dead short would be present. Hence the pairing of two identical caps that present "no" polarity.
_________________
F@H.. to solve mankind's maladies.. in our lifetimes!

jimmy-j · Posted: Sun May 18, 2008 4:23 pm Post subject:

Well, the capasitor that I thought was in backwards blew again and I replaced it with one of the same size but the other way round, (The way I thought it should have been done in the first place) Now it is running again and been fine for the last few hours, Going to leve it pluged in through the night to check it out but I feel confident it will run witrhout any further trouble.

Mr T · Posted: Sat Nov 15, 2008 11:45 pm Post subject:

Now add the ASUS A8N-SLi deluxe....
_________________
I have been programming on computers since the ZX81.
I am an apprentice trained Electronics Engineer with qualifications to back it up.
I have been repairing computers since 1996.
Yet to some people I still know nothing...

evasive · Posted: Sun Nov 16, 2008 3:53 am Post subject:

Is it me or is the entire socket754/socket939 line of Asus boards showing up here? That would be NO fun at all...
_________________
We hate rut, but we fear change.

System error, strike any user to continue...

evasive · Posted: Sat Jan 17, 2009 6:56 am Post subject:

asrock p4vm890, the one near the northbridge. I see a strip of green/gold ones that I spotted on other bad boards too... I wonder when they will go... crying

_________________
We hate rut, but we fear change.

System error, strike any user to continue...

Karlsweldt · Posted: Wed Jan 28, 2009 2:11 pm Post subject:

Not sure if the problem is common, but my second system has developed the 'bad caps' affliction! It is an ECS 848P-A, Socket 478. Worked perfectly for a few years, then the past few days it would lock up with no reason. Only a hard reboot got it working again. I reset the device cards and memory, and happened to spot three domed caps just behind the CPU!
It will be down until I replace the caps. No sense in running it and causing any permanent damage. The caps were 1500 mfd, 16 volt.. branded "Ost" with a '+' on the top. Will be monitoring my other system, with a similar Chaintech mobo.
_________________
F@H.. to solve mankind's maladies.. in our lifetimes!

evasive · Posted: Thu Jan 29, 2009 2:11 am Post subject:

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