Classic 2008 Samsung LN52A580 Bad Caps

[pollymath]

I've got all the classic signs of bad caps on my trash-picked 52" Samsung backlit LCD tv. I actually caught the previous owner throwing it away (gently), and he said it had been having trouble starting up.

I took it home, plugged it in, and the red LED just clicks on and off continuously.

Now, I'm not an electronics guy. I've wired cars and motorcycles, but little electronics are not my thing. That being said, a free 52" TV is hard to turn down, even if it does require some solder and a few hours.

Models specs are as follows:

Model Code: LN52A580P6FXZA
Version: SQ01

Seeping/bulging capacitors located with specs:

25v
820 uF
105ºc(M)

and a clicking DEG SDT-S-105DMR relay.

My worry is that I'll replace these capacitors and still have to do other stuff. I've read horror stories of reflashing EPROMS, replacing TCONS and a host of other acronyms that sound scary. If I solder in some new capacitors and it turns out the panel is toast, then I'll call it a learning experience.

What are the chances that I can get away with just a basic unsolder/resolder of the bulging capacitors and call it a day?

[dick_barton]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Take it one step at a time and people can help you.
First how about some nice sharp photo's of your power supply both top and bottom and of the other circuit boards. Also one showing the full back of the set with the cover off showing the interconnections of all the boards.

[budm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

This TV is also known for failed tab bonding, and also C102 problem on the main board. If you search 'C102' you will see lots of threads
http://www.shopjimmy.com/samsung-bn9...a580p6fxza.htm
http://www.shopjimmy.com/samsung-bn9...580p6fxza.htm#

[dskall]

Re: Classic 2008 Samsung LN52A580 Bad Caps

I repaired a similar model that was cycling on and off and had distorted picture when it did work. I traced to the C102 it is a 47uf low esr smd with AS7 marking. Also C131 is the same cap for the other regulator witch I also replaced

[dick_barton]

Re: Classic 2008 Samsung LN52A580 Bad Caps

It may well be worth your while lifting C102 to start with and see if that improves the situation. If it does then it can be replaced.

[budm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Or he can parallel low ESR lytics cap 47~100uF in parallel with C102 to test.

[CapLeaker]

Re: Classic 2008 Samsung LN52A580 Bad Caps

that should be an easy fix.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

So should I still bother replacing the bulging/leaking 25v 820uF capacitors on the PCB? Or start with the C102 and work may way back?

[tvtimmy]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Yes. Replace that one and the 1000uf, 2200uf, and all others on power board.
You only want to take it apart once, right? When that task is done, replace the smd cap 47uf on the mainboard.

[CapLeaker]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Always fix everything that you know is wrong.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Or he can parallel low ESR lytics cap 47~100uF in parallel with C102 to test.

Bud, any walkthroughs or descriptions on how to do this?

When you guys say "lift the C102 to test", what does that mean?

[dick_barton]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Lift, just means unsolder and lift (remove) the capacitor off the board.
Or just do what Budm suggests in post#6

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Wouldn't removing the C102 capacitor just keep it from functioning at all?

Sorry, despite rewiring numerous vintage motorcycles, I'm kinda dull when it comes to electronics stuff.

I did figure out to upload some pictures to a badcaps.net hosted album, though:







I'll try to collect some better pictures of the entire boards for reference purposes.

[dick_barton]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Wouldn't removing the C102 capacitor just keep it from functioning at all?

Not necessarily. However the post pointed to suggested that you leave it in place and solder another capacitor across the existing one.

Edit
I see the faulty capacitors are still in circuit which will not help fault finding.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

I found Budm's description of doing the C102 test.

[dskall]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Replace the bulging caps and see if that fixes problem. If you have to order caps get a 100uf>10v cap in case replacing bulging caps doesn't work. Potential $10 to fix tv

[martino]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Welcome to your new hobby Warning,tv repair WILL become addicting!
Excellent pictures too,refreshing to say the least.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Replace the bulging caps and see if that fixes problem. If you have to order caps get a 100uf>10v cap in case replacing bulging caps doesn't work. Potential $10 to fix tv

I'm curious why I should get the 100uf>10v caps? Or at least, why I might need to replace them if they aren't noticeably bulging?

Speaking of which, is there a buyers guide for replacing bad capacitors? I saw that ShopJimmy has a repair kit for my power supply, but at $20 it includes quite a few things I don't need likes fuses and a circuit.

If I bought via DigiKey, I could save nearly $12 and only get the capacitors.

Thing is, while it's easy to find 25v 820uf 105º aluminum Panasonic caps, there seems be many different options besides those three criteria. There are over 43 results when I filter for 25v 820uf 105º aluminum capacitors.

[mariushm]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Buy Panasonic FM or FR series capacitors, 820uF 25v rated. They're low ESR and of high quality.
If you have to, you can buy versions with higher voltage rating like 35v, but be careful of height (higher voltage rating capacitors may be too tall)

Replace the 470uF 25v capacitors, Panasonic FM or FR would be great for these as well. Same advice, if you can't find 25v rated unlikely as that would be, 35v rated will work just fine.

Replace the 1000uF 10v ones as well ... you can replace with same FM or FR series rated for 10v or 16v or even 25v rated, any would work fine as long as they fit (height wise)

Other series that would be acceptable Nichicon HM, HN , HW (listed as uhm, uhn,uhv on digikey), Rubycon ZLG , ZLJ , United Chemi Con KZE, LXZ, maybe KY,KYA,KYB ..


Replace that C102 capacitor. Use same capacitance, use same or higher voltage rating.

[pollymath]

Re: Classic 2008 Samsung LN52A580 Bad Caps

Buy Panasonic FM or FR series capacitors, 820uF 25v rated. They're low ESR and of high quality.
If you have to, you can buy versions with higher voltage rating like 35v, but be careful of height (higher voltage rating capacitors may be too tall)

Thanks for spelling it out for me. It sounds like same capacitance and voltage being same or higher than original are the best choice. It also looks like the ones I found on DigiKey are Panasonic FM-Series.

I assume temp doesn't matter too much?

Replace that C102 capacitor.

What kind of capacitor is it?