Capacitors very hot

**tigreeireceltaid** · 01-31-2010, 01:14 PM

Re: Capacitors very hot

I forgot to mention that the capacitors and the cooper wired rings do not show any sign of damage. I have changed capacitor that area bout to pop, or the top is getting up, but these seem ok

**tigreeireceltaid** · 01-31-2010, 01:26 PM

Re: Capacitors very hot

the cooper wired rings I mentioned above are the toroidal core inductors od the motherboard (I juts found its proper name)

**willawake** · 01-31-2010, 01:29 PM

Re: Capacitors very hot

pls provide pics and details of system

**Pyr0Beast** · 01-31-2010, 02:54 PM

Re: Capacitors very hot

There might be problem with capacitors. Use bad ones and efficiency drops like a rock -> more heating for the same effect

**tigreeireceltaid** · 02-01-2010, 01:33 PM

Re: Capacitors very hot

Hi, Thanks for replies.
I am having difficulties to take a good picture. I noticed yesterday that there is some kind of brown liquid around few black squares (I think they're called vrm's) right beside the coils and the capacitors that are running hot. I have attached a picture that I found in this forum that shows these little black squares (mine aren't that bad, yet!)
Thanks for any help. I really want to know if this MoBo can be repaired or not.

Attached Files

**etnietering** · 02-01-2010, 02:01 PM

Re: Capacitors very hot

Yikes! I see 4 bad caps. The bottom one in the long line, and the 3 that are mostly visible at the top. That's not the only problem though. Some of the black squares appear to be dual diode packs (the ones with the ~ + ~ markings). I can't read the labels on the others, but they're most likely some sort of transistor. Some of these are quite well toasted, and they're probably all bad. They should all be lined up, solid dark black, with no discoloration on the board around them.
There's a chance the board would be fixable...you'd have to replace all 6 of those devices (they're SMD and this would be challenging if you're not experienced with it), and I'd replace all the caps visible in your picture. Even then though it may have damaged something else in which case the board wouldn't work properly again without a lot more work.
Running the board in this state is only making it worse, so if possible I wouldn't run it at all, but if you need it only run it the minimum amount possible and try not to work it too hard. Your best bet would be to replace the motherboard, or even the whole system.

**370forlife** · 02-01-2010, 03:04 PM

Re: Capacitors very hot

I do this alot too, must be a michigan thing. It's not actually his board, just one he found on the forum.

(I just noticed that because I recall seeing this picture somewhere else and someone commenting about how that one mosfet got so hot it melted the solder holding it on)

**Pyr0Beast** · 02-01-2010, 03:42 PM

Re: Capacitors very hot

Originally posted by 370forlife

I do this alot too, must be a michigan thing. It's not actually his board, just one he found on the forum.

(I just noticed that because I recall seeing this picture somewhere else and someone commenting about how that one mosfet got so hot it melted the solder holding it on)

This is something similar to K7SOM mainboard. It doesn't use the proprietary IC, just TL494.

**tigreeireceltaid** · 02-01-2010, 04:47 PM

Re: Capacitors very hot

Thanks all.
The picture is not my board, but the black squares on it are the same that started leaking in mine.
Can you please confirm the name of these black squares, and can some one point me to how to replace them, like where to buy them? what type are they,etc?
My board is an Asrock P4VM890 and I bought it new only 18 months ago....very short life time!
Do you think something else if failing and made these little things to start leaking? I
Thanks,

**Pyr0Beast** · 02-01-2010, 06:09 PM

Re: Capacitors very hot

These 'black squares' are called mosfets. They cannot leak. What can leak are nearby capacitors. You can take a picture of your mainboard and the part that concerns you and we can tell you a more precise answer then.

**etnietering** · 02-01-2010, 06:17 PM

Re: Capacitors very hot

Yeah I guess I should read a little more carefully before I post....
Anyway, if you can read the part numbers off the mosfets (it will be letters and numbers, such as MTW32N20E) somebody here will be able to recommend replacements. You'll need to replace the caps too - you'll need the following data from them:
Manufacturer
Voltage
Capacitance (uF)
Series
Diameter
Post all that information here as well and people will be able to recommend replacement caps.

**tigreeireceltaid** · 02-02-2010, 03:51 AM

Re: Capacitors very hot

Hi guys, thanks a lot for your help. I will get a good camera today and I will post pictures. The capacitor nearby do NOT show any sign of damage, and I can't see this liquid near them. Anyway, I will post pictures so that you guys can make a call on it. I will try to get the info that etnietering is looking for too.
I'll be back!

**Pyr0Beast** · 02-02-2010, 06:31 AM

Re: Capacitors very hot

ok. Good luck

**tigreeireceltaid** · 02-02-2010, 10:00 AM

Re: Capacitors very hot

Hi,
My wife is away and took the camera with her, all I have left at home was a basic camera, apologies for the bad picture. On the mosfets there is code 72T02G which after googleing it I found their data sheet (attached to this post). the capacitors beside the mosfets look very clean, without any sings of being leaking, they are 16V 1600uF. I tried to find similar mosfets in ebay, but I am not sure what specs to look for; in the data sheet there is so much information! Any help will be much appreciated,

Attached Files

**Pyr0Beast** · 02-02-2010, 10:16 AM

Re: Capacitors very hot

Ahh, that's nothing to worry about. This yellow-brown 'liquid' stuff is called resin or flux. It is used for better wetting and cleaning of solder while soldering. You may clean it with some acetone or similar solvent.

I think that the problem lies in BIOS. After a crash it loaded the safe defaults, bringing your CPU speed to the lowest possible.

**kaniki** · 02-02-2010, 10:35 AM

Re: Capacitors very hot

If i remember right msfets are made out of solid materials like metal, ceramics, etc. so they definitely did not leak any brown stuff like that.. could it be some kind of oxidation or burn marks.. or something that got on to the board. I noticed that the 2 on the left side of the picture are not even solder joints for the mosfets. From what i can tell from the reviews about this board, it was not a really reliable board..

http://www.newegg.com/Product/Produc...82E16813157106

but also from what i read, they did bring up a good point.. this is a 20 pin board.. what kind of a vid card do you have? maybe the video card is using too much power for the layout and that is what is overheating everything? dont know.. just a thought.

**tigreeireceltaid** · 02-02-2010, 03:51 PM

Re: Capacitors very hot

Hi,
The liquid looks like oxide, but it is only on this area of the board, all other mosfets are very-very clean. I have a Sapphire X1950Pro; I have attached to it a 6pin connector from the power supply to the back of the card. My PC worked fine, I have another PC with same CPU and similar card and they always performed almost the same, but now RAM, VGA, CPU everything is running just at half of speed (I am becnhmarking with Passmark 6.1 software). I did nothing to it, just started to perform worse and worse. Any more ideas?
I must add that I tried installing Win XP in a new HDD, tried different PSU, different CPU, with and without VGA, changed the RAM, basically tried everything before noticing the heat in the heatsink and coils, and this liquid in the board.

Thanks,

**tigreeireceltaid** · 02-02-2010, 04:03 PM

Re: Capacitors very hot

My motherboard is working but is just that is doing this at half speed, so I think there is nothing broken, but damaged instead. Is there any way I could test the capacitors, coils and mosfets?
Thanks,

**pfrcom** · 02-02-2010, 05:51 PM

Re: Capacitors very hot

In my experience brown stains around the mosfets indicates they have been overheating, causing flux used during manufacturing to leach out

Look underneath the board to see if it is discoloured beneath the mosfets, also indicative of overheating

Capacitors near the mosfets appear to be Chemicon, perhaps KZG which have a reputation for failing in hot conditions

Capacitors very hot

Capacitors very hot

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