Samsung T260

[LAS]

Re: Samsung T260

As to the transformer, is this the one? Will check first out of circuit of course.

http://www.ebay.com/itm/TM-10160-Inv...item3f0ac3e1d9

[retiredcaps]

Re: Samsung T260

De3rcr has one of the best pics I have seen. This is the 1.5%.

https://www.badcaps.net/forum/attach...0&d=1290283049

[retiredcaps]

Re: Samsung T260

As to the transformer, is this the one? Will check first out of circuit of course.

http://www.ebay.com/itm/TM-10160-Inv...item3f0ac3e1d9

Yes. 99.9% feedback and auction even lists Samsung T260. And yes, test it out of circuit to verify the part is good first.

It will probably take 2 to 3 weeks to arrive from Hong Kong though. lcdparts.net has it, but you are paying $21.99 + shipping.

[retiredcaps]

Re: Samsung T260

While I'm at it, I'm thinking of changing R301 to something a bit beefier. Perhaps 2W. A good idea?

I don't know enough to say yes or no. Maybe PlainBill or someone else with some more insight can give you the pros and cons.

[LAS]

Re: Samsung T260

De3rcr has one of the best pics I have seen. This is the 1.5%.

https://www.badcaps.net/forum/attach...0&d=1290283049

The story of my life...

[mariushm]

Re: Samsung T260

Maybe it's just me or the angle but it looks like one of those yellow 1000uF started to swell up. Maybe even the 820uF close to it.

Anyway... looks like a bad transformer so you're on the right track.

It's more expensive but you could also go for a complete board - new ones are listed on eBay for around 57$. Just search for the board code, ip-54155a

http://www.ebay.com/sch/?_kw=ip-5415...&_stpos=&gbr=1

Could also use this as a way to determine resistor bar codes or other things when yours are burned up but generally the ebay pictures are not that high quality to see the text on parts.

[LAS]

Re: Samsung T260

OK, inverter transformer confirmed bad. Thanks all. Will get parts and reassemble and report back.

Thanks mariushm for the suggestion of ordering a new board. You're probably right, that's the best way to go, but then again this is a hobby for me, and it just doesn't have the adventure of putting it back together piece by piece...

[retiredcaps]

Re: Samsung T260

It's more expensive but you could also go for a complete board - new ones are listed on eBay for around 57$. Just search for the board code, ip-54155a

$8 vs $57? If it is me, $8 wins every time especially when I know what the problem is. Plus with a replacement board, you still get crappy brand, albeit, new caps.

More importantly, you don't get the satisfaction of actually FIXING something at a component level. Board swapping can be done by anybody is typical of your "repair" shop today.

What would be really cool is actually fixing the transformer, but even I would not do that when I can get a replacement for $8.

edit: Plus by saving $49, LAS now can now potentially buy 2 more 26 inch fixer uppers!

PS. In Canada, if you are in the highest tax bracket, you need to make $100 income to get $49 (after federal, provincial, HST/PST, and GST taxes).

[PlainBill]

Re: Samsung T260

Ordinarily I wouldn't bother replacing the resistor, but I am curious as to why it got so hot. It's obviously tied into the inverter output voltage.

Here are some rather extreme assumptions. Assuming you are dropping 2000 volts across R301, with the 390K value, that's 10 watts. The actual voltage is probably lower, so guessing it's about 1400 volts peak, or 1000 volts rms. That still gives 2.5 watts.

Yeah, definitely go with something beefier. My assumptions are probably way off the mark, but it's not going to cost much to buy the higher power resistor.

PlainBill

[LAS]

Re: Samsung T260

I've been thinking that I may have found the cause for the transformer failing, and want to see if this resonates with anyone. When taking out the transformer last night, I was working on the two sets of pins spaced closely to each other (see little red boxes in annotated photo) and one set of pins were bridged with solder, and the other set is not. I'm thinking that they should both be bridged with solder. Has anyone who has replaced a transformer recall if this should indeed be the case?

[newbie1]

Re: Samsung T260

I've been thinking that I may have found the cause for the transformer failing, and want to see if this resonates with anyone. When taking out the transformer last night, I was working on the two sets of pins spaced closely to each other (see little red boxes in annotated photo) and one set of pins were bridged with solder, and the other set is not. I'm thinking that they should both be bridged with solder. Has anyone who has replaced a transformer recall if this should indeed be the case?

I have replaced 2 inverter transformer before. One on a T240 & another on a 2233sw. If i recalled correctly, it does not matter whether both the set of pins are bridged or not bridged with solder because the 2 pins close together are actually linking to each other.

Go with retiredcaps suggestion and replaced the inverter transformer. It is definitely much cheaper than replacing the whole board. For my previous cases, replacing the inverter transformer solved the problem. And also in my opinion, it is wise to replace all the caps (minus the big cap) as well, to avoid opening the monitor again.

[LAS]

Re: Samsung T260

OK, now the Big Wait as I've ordered all new electrolytic caps (either Panasonic FM, FR or FC) a 2 and a 3W resistor - I'll use the 3W if it fits, and and new transformer from Hong Kong via eBay. Looking forward!

[retiredcaps]

Re: Samsung T260

I have replaced 2 inverter transformer before. One on a T240 & another on a 2233sw. If i recalled correctly, it does not matter whether both the set of pins are bridged or not bridged with solder because the 2 pins close together are actually linking to each other.

From the picture at

http://www.lcdparts.net/TransformerD...ProductID=3696

the two middle pins are primaries and should have a resistance of less than 1.0 ohms.

[LAS]

Re: Samsung T260

OK, I have bookmarked that page and will refer to it when it comes time to install. Thanks all.

[LAS]

Re: Samsung T260

I must say it really feels like Christmas when Digikey arrives!

[retiredcaps]

Re: Samsung T260

I must say it really feels like Christmas when Digikey arrives!

If it wasn't for the $8 USD shipping and handling costs to Canada, I would order from digikey way more often rather than "saving up" for a big parts list. In addition, anything over $20 USD and we get dinged by Canada Customs for taxes, import duties, etc.

I hate paying 40% ($8/$20) in shipping/handling costs for an order.

The local electronic stores here don't carry low ESR caps and their selection of other stuff is nowhere near what mouser/digikey/etc carry. They also price their stuff like they never heard of online distributors or competition.

[LAS]

Re: Samsung T260

Mouser any better?

[jetadm123]

Re: Samsung T260

Mouser any better?

Digikey has slightly higher prices, but the lowest cost shipping for small orders. Mouser has an excellent selection, lower prices, but even if you order only 7-9 caps, you're probably going to pay around $7-$9 for shipping/handling.

[LAS]

Re: Samsung T260

And we have success! A big thank you to all who helped. A combination of a new inverter transformer, new caps and a new resistor did the trick. I'm already scanning Craigslist for another project.

In the meantime, I want to see how many hours are currently on this T260. Does anyone know how I can access the service screen / menu?

Thanks in advance.

[retiredcaps]

Re: Samsung T260

I'm already scanning Craigslist for another project.

Wow, that was quick shipping from the far east. Good job on the repair. It should serve as a nice 26 inch computer monitor.

Just a thought for future projects. When I first started, I thought once I fixed a few computer lcds, I could graduate and find cheap 42inch or larger TVs. After all, the theory is more or less the same (so I thought).

Well after participating here for a while now, there is an order of magnitude in complexity with TVs. For example, plasmas are generally NOT user component level fixable unless you get REALLY LUCKY and find a simple blown fuse/cap. It is often complete board swaps. And IMHO, the economics are questionable at best in fixing 720p or less plamsas.

If you do "graduate" up to TVs, try to stick to LCD TVs. They may be more component level friendly to fix. Try to stick to first tier names where service manuals might be available and avoid all the 2nd and 3rd tier junk brands.

This site has some good tips and explains some of the complexities of plasmas, etc

http://blog.coppelltvrepair.com/