Re: HELP: Replacing Lelon 10v 3300uF capacitor in computer motherboard


<steve.parson@xxxxxxxxx> wrote in message
news:1118169966.758359.232540@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi everybody. I'm an aspiring electrical engineer (going into first
> year university in the fall) and have a problem with an old motherboard
> (AOpen AK-73Pro(A)). Two capacitors (near the ZIFF slot on the
> motherboard) are leaking electrolyte, and the computer experienced
> completely random hard shutdowns. They are labelled in the diagram
> provided by the manufacturer as "Low ESR condensers".
>

I assume the 2 caps are TC5 and TC6 and have a gold -ve stripe. Anyway look
carefully at all the others of the same manufacturer. (7, 16, 19, 26, 27,
29, 31, 39, 42) if they are not bulged or leaking now they will in the
future.

> They are Lelon 10v 3300uF capacitors. I was wondering if there was a
> distributor in Canada that doesn't ask for a minimum order so I can get
> these 2 capacitors cheap. If anyone can get me a part number of the
> equivalent and a distributor I would be forever grateful :) There seems
> to be so many parts to choose from that I don't know what to pick.
>

Just go to your local parts place and get what he has on the shelf. I
replaced mine with cheap 105°C caps, TC5 & 6 with 3300uf 16V and the others
with 1000uf 16v even though TC16 & 19 & 27 were 1200uf. It works fine.

> Also, I only have basic soldering experience. Is the process of
> removing the old capacitors and putting the new ones in overly
> difficult? If I approach it with extreme caution, should I have a
> problem? Any insight would be appreciated.
>

I don't know what your skill level is when you say basic. I use an iron at
330°C and a solder sucker. Get on and off as soon as the solder is melted.
New cap in. Mind the orientation. Apply solder to the pad and cap lead,
apply iron to the solder so that solder runs to cover pad and lead and get
off. 1 to 2 seconds if the cap leads are clean, if not clean them with an
eraser first. Cut off leads and your done.


> I understand the cost of replacing the capacitors is near the cost of
> replacing the entire motherboard, but it is fitted with 1024mb of PC133
> SDRAM that I don't want to replace with DDR. (cash-strapped).
>

No it's not. 11 caps = less than 6 $AU. Cheap fix.

> Thank you in advance.
> Steve ( steve.parson at gmail.com )
>

One other thing. Clean off any leakage from the caps.

Another one other thing. Static electricity. Ground yourself before you
start. But then you knew that didn't you :o)

Gordon

.

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