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How hard is it to solder capacitors? (answered first hand)

12718 Views 18 Replies 10 Participants Last post by  Grim
I've never soldered anything but I'm pretty confident with a little coaching I can pull this off. I was just hoping you guys can give me some pointers. This fix is for an older projection t.v.
Attachment 87106

I would be replacing 4 of these capi's.

edit: Turns out its pretty hard if its your first time... but it is definitely not impossible. The more you work with solder the better you can control it.
LL
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i dont think it'd be too hard.. just don't mess anything up? I never actually soldered anything, but when my friend said he was going to solder something he sounded pissed so .. lol idk good luck
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well i have soldered a lot of things. and i wouldnt try capacitors, because they store electrical energy and i have soldered batteries and ruined a few battery cells because i was putting two much heat into the wires while trying to solder it. And the same can happen with capacitors.

If you are going to do it keep the solder time down, keep it clean, and make sure you dont drop and solder onto other parts of the mobo
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Like stated above, capacitors have electrical energy. I would recommend putting a small dot of solder on the board first and then placing the capacitor wire in it, that way you don't touch it with the solder gun.

Also make sure you don't put solder on other parts of the motherboard. You wouldn't want to join two connections that shouldn't be joined together. Other than that, it's pretty simply.
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putting a drop of solder onto the motherboard then placing the capacitor is the only way to do it but solder cools down rather fast so you would have to place the two dots, then kind stick the tip of the soldering iron on one heat it up back to a liquid state then the other real fast then place the capacitor into it gently
Thanks for the tips everybody. I'm currently trying to pull the board out (the pic above I found online) I'm trying to check if it is indeed these capacitors. They are supposed to be bulging from what I hear.
easy peasy
through hole or snap in caps are very easy, Surface mounts are harder... seriously, just take your time do them one at a time, and cut the end tails off when your done... nothing to it.
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I agree. I've made a few custom simple circuits on PCB from radioshack and caps were a sinch. Other things like IC's are a pain though

Take your time and let things cool down after you solder each lead and you should be golden.
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Can I get confirmation that the bottom cap is bulging out a little?

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Can't really tell but if it looks bulging, it is. It should actually be sitting a little recessed around the casing.
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Thanks for all the help again guys... Rep + to all you guys. One more thing though. The guide I'm following says that I can use 1000uf 35v or 25v caps. However, the ones currently on the board are only 16v. Will having a higher voltage be better? Can I even do that?

Ah, and last. How do I remove the ones that are currently on the board?
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Quote:

Originally Posted by Heavy Light 117 View Post
I've never soldered anything but I'm pretty confident with a little coaching I can pull this off. I was just hoping you guys can give me some pointers. This fix is for an older projection t.v.
Attachment 87106

I would be replacing 4 of these capi's.
Hey there.

Well, truth is, to answer you question directly "HOW EASY" it will be is really relative lol.
A common knowledge of electronics, or more specifically, electronic circuits would be of great help, and the more you know the better obviously.

I've been fooling around with circuit boards for seriously, longer than I can remember - so soldering is pretty basic in my mind.

But in your case, you've NEVER soldered anything before, so you need to pay attention to a few things. But its not brain surgery at all
And its a lovely skill to develop.

Here's a quick lil solder guide for you (only one page)
http://www.epemag.wimborne.co.uk/solderfaq.htm

give it a read, It'll bring out some pointers to your forefront that you should always keep in mind/make a part of your technique.

Let me APPLAUD you for deciding to try to FIX your motherboard.
The truth is that technicians of old different from the ones today.
Today's technicians are lego fiddlers!
Tech's of yesterday tried to actually FIX the damaged parts where possible, and not just replace them!


Reparing a motherboard requires some bit of sensitivity though
Namely bacause there are heat sensitive components on the board that you dont want to damage.
You also need to pay keen attention to electrostatic ("shocking") your mobo.
You can get around that simple by either using a GROUNDED soldering Iron, OR, plugging out your 2 prong plug (ungrounded) soldering Iron as soon as its hot.

(and, duh, dont let solder get where it shouldnt, to short anything.)

PLEASE visit this site.
www.badcaps.com

they're your motherboard's salvation!

ANYTHING related to motherboard repair, thats the place to be.

They have all the history of why MOBO's have/develop this problem too.

Now that I've lectured you,..... lul
I'll say one last thing, my pop said it to me and it helped my technique IMMENSLY

- the Idea behind soldering is NOT to get the solder hot, and drop it unto whatever

it is to get the JOB hot, then to apply solder.

To take out the caps, It would be great if you had a solder sucker.

If you do, you can just heat ONE leg, suck.
Heat the other leg, then suck and it should be more or less free by then.

if you DONT have a solder sucker - you'll have to develop a lil technique.. that I call....

ok havent quite named it yet.


But you'll have to heat a leg, pull on that side a bit so that it comes forward a bit (so much as the other, unheated and still fixed leg will allow it to).

Then do the same to the other

continue that process till they both come loose.

Then you can drop back in the new caps.. with a bit of common sense.

REMEMBER THE POLARITY OF THE CAPS!!!!!

the striped part of the cap USUALLY (its written on it) is negative, and so goes to the negative leg.

That side of the area of the PCB where the cap sits may also be coloured to help you.

but never put them in backwards!

Their are BETTER guides on the site that I gave you.
Step by step guides on MOTHERBOARD repair RE: capacitors

TEll us how it goes!


-EDIT-
Yeah, you have at least 2 bad caps allright.
Remember, only replace them with caps of higher voltage/capacitance.
NOT LOWER.
In the case of the mobo though, try to get as close a match where capacitance is concerned.
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I 100% agree with the advice above and I also want to add if you are worried about getting shocked by the cap (you wont after the board has been off for a bit anyway) you can take a piece of wire and with a set of pliers with rubber covers over the handles touch both leads of the cap at the same time to discharge it.

Don't worry about soldering it is easy, if you can de-solder the bad caps you can get new ones on easy. One thing you need to look out for when you are removing the old caps. You don't want to heat a large portion of the board up too much, this can cause measleing. A few white specs will appear in the PCB around the area if this is happening. This only happens though if you are working in one spot for more than 15-20 sec though so just be careful that you don't leave the heat on too long when you are trying to remove the cap. Good luck and let us know how it goes!
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Thanks for the help Grim and Marshall. I'll be heading to my nearest tech shop later today to by the things that I need. I'll keep you guys posted.
Update here... the operation was a success. After practicing with a couple old sound cards other old equipment I decided to take the plunge. The operation took 4 hours from beginning to end. This included removing 4 caps and replacing all of them with brand new ones. I have a new found admiration for techs who solder on a daily/weekly basis. It seriously requires a steady hand and a deep understanding with the materials that you have to work with.

I can thank Grim enough for the tips and links. They really helped a lot. Thanks again everybody for you help.
Awsome! Good job man ^_^

So, did it work?
Show us some pics!

And Very Good Idea practicing on old circuitry first.
I swore I mentioned that you should
- good thing you were smart lol.

I encourage you to continue too.
You can use just commonse sense to make some nifty little circuits. ^_^
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Originally Posted by Grim View Post
Awsome! Good job man ^_^

So, did it work?
Show us some pics!

And Very Good Idea practicing on old circuitry first.
I swore I mentioned that you should
- good thing you were smart lol.

I encourage you to continue too.
You can use just commonse sense to make some nifty little circuits. ^_^
Yeah it worked great. It could probably be better but for a first timer it wasn't bad at all. TV works again. Its a 65inch Projection HDTV and it would have been a shame to leave it as it was. I would show you pictures of the board but I already put it back into the TV and sealed it up (can't wait for my dad to get home *saved him a couple hundred bucks*).

I have all the equipment now so it wouldn't makes sense to just leave them here without trying some other stuff. Thanks again for all the help grim... your expertise was indispensable.
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Originally Posted by Heavy Light 117 View Post

(can't wait for my dad to get home *saved him a couple hundred bucks*). .
tell me now.
Isnt that just.. a great feeling?
sink it in. Its savoury


Quote:

Originally Posted by Heavy Light 117 View Post
Thanks again for all the help grim... your expertise was indispensable.
hey no biggie.
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