Classic 2008 Samsung LN52A580 Bad Caps

[budm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

https://www.badcaps.net/forum/showpo...&postcount=129
Digikey has them. TANTALUM 47uf 10V will be fine.
BTW, the BAR marking is POSITIVE!

[mariushm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Switching power supplies require Low ESR capacitors. It's almost impossible to find 85c rated capacitors which are also Low ESR, so you'll pretty much find only 105c rated capacitors that would fit your needs.

There are 125c and 130c rated series out there, but usually they're bigger in volume for same capacitance and the specifications are not as great as 105c parts (tradeoff for temperature handling)

What kind of capacitor is it?

Several people have told you this tv has a problem with capacitor C102 .. I personally don't know this TV and I don't see the capacitor in question in your pictures.

Look on the board for a capacitor with C102 code near it and read the capacitance and value from it. From what I see in the thread, I guess it's 47uF but you should check it out by yourself.

dskall also suggest replacing C131 as well, which should be the same capacitance and voltage rating as the other one from what he says.
Since he says they're used with linear regulators, my guess is the voltage on them is 5v or 3.3v or some low voltage, so the surface mount electrolytic capacitors are rated for 10v.. can't tell without pictures of the area
You can probably use 47uF capacitors rated for 25-35v, at such low capacitance the capacitors will be very small either way, shouldn't make any difference if you use capacitors rated for 10v or 16v or higher voltage

ps .. correction, just saw budm's post. Those are not electrolytic smd capacitors, those are polymer capacitors, with better specs. So using electrolytic capacitors for those may not be a great idea.

I'd go with polymers, these should probably work (and yeah, with this style of capacitors, the vertical bar represents the POSITIVE side)

http://www.digikey.com/product-detai...7-1-ND/4755577
http://www.digikey.com/product-detai...5-1-ND/4755585

If you want cheaper or easier to solder, you can probably use capacitors of slightly higher capacitance without any risks, like these for example

68uf 10v : http://www.digikey.com/product-detai...227-ND/4991510
100uF 16v: http://www.digikey.com/product-detai...3-1-ND/3768616

On these, the vertical bar is the negative. They'll probably work just fine.

[ReeceyBurger123]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Replace all Samwha, Wl, Wb and Xc series caps on that psu.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Has anyone posted any walkthrough on how to switch the poly caps to electrolytic smd capacitors? Seems like quite a change.

[budm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Has anyone posted any walkthrough on how to switch the poly caps to electrolytic smd capacitors? Seems like quite a change.

What does it mean to change Poly to lytics SMD? Poly cap is SMD form factor or through hole?
The term POLY can is????? Polyester? Polypropylene? etc.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Sorry.

You gotta remember that you guys use some terminology that probably 99% of the population has no idea about. Very few people do electronics repairs, and even less have it as a "hobby". So bear with me.

I meant changing a Surface Mount Ceramic or Solid Chip Capacitor (a little block thing) to a PCB Mount Electrolytic Aluminum Capacitor.

The Surface Mount won't have holes like a PCB Mount, right? Because it sits "on top" of the board, versus going through it?

[dskall]

Re: Classic 2008 Samsung LN52A580 Bad Caps

My post about the 100uf caps where so you would have something to check with at C102 if replacing other caps didn't fix problem. The specs for that ic if I remember are 47-100uf low esr ceramic. I think the output is 8v so 10v rating is good

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

That's what I suspected. Thanks for the clarification.

I wish I could understand better how to use the round capacitors to check or "bypass" the ceramic one. I'm a visual guy.

When this is all said and done I'll take lots of pictures to help future newbs like myself.

[dskall]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Sorry for confusion. Replace your bulging caps first. If that doesn't fix problem. then if you have a47uf> you can tack it across the c102 and see if it works if that fixes it you would need to get correct caps for proper repair. I do not remember the c101 number. If you post the number off of it I can give you specs for the caps.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Made the order. Total for all 8 caps including the SMD and 10v tester: $8.

I decided to forgo a solder sucker or wick, and will grind my soldering iron down to a finer tip. Guess I need to find some thinner solder, as well.

[dick_barton]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Grinding the tips of soldering irons may not always work. Some have coated tips and when they lose their coating also lose their ability to take solder. Others tips may be made of copper or other metal which will take filing down.

[martino]

Re: Classic 2008 Samsung LN52A580 Bad Caps

maybe spending a few bucks at your local low cost hobby store would be best.Get yourself a lower watt iron and thin solder.Doesn't have to cost much.
Once your new hobby is fixing tv's you can always get a more expensive set

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Hey ya'll thanks for your help. I ended up getting a whole pile of different capacitors, but I only replaced 3 that were blown.

Put it back together, fired it up, and it's been running fine for the last year.