Samsung LN46A550 Power Cycling

[budm]

Re: Samsung LN46A550 Power Cycling

So were the ones I ordered from HBElect.com decent for the job?

http://www.hbelects.com/index.php?ma...roducts_id=625

I do not see the spec, but if Terryfictv uses it and it works then it should be OK.

[Terryfictv]

Re: Samsung LN46A550 Power Cycling

Here is how I mount the new cap

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

So were the ones I ordered from HBElect.com decent for the job?

[budm]

Re: Samsung LN46A550 Power Cycling

https://www.badcaps.net/forum/showpo...&postcount=135

https://www.badcaps.net/forum/showth...t=25810&page=7

[Terryfictv]

Re: Samsung LN46A550 Power Cycling

http://www.ebay.com/sch/i.html?_odkw...citor&_sacat=0

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

budm, I tried looking up the caps online but couldn't find any information on it - on a legible website haha. I ordered the ones from HBElect that terryfic suggested, will these work? Thanks,
Zack

[budm]

Re: Samsung LN46A550 Power Cycling

So you did not use the low ESR cap to try out if it will make the TV to come on. I have done many experiment with paralleling the caps to see how long it will last compare to the original caps, so far none of them came back yet.

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

Ordered from HBElect, Thanks Terry

[Terryfictv]

Re: Samsung LN46A550 Power Cycling

Mouser.com 581-TAP476K016SCS $2.16

HB Electronics 12T-215 $1.15 hbelects.com

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

What is a low enough ESR for this application? Which capacitor off of digikey or mouser did you guys use?
Thanks,
Zack

[Agent24]

Re: Samsung LN46A550 Power Cycling

The old SMD capacitors are not on there anymore... I can replace the Su scon but I don't know what to test from there? Should I just order those SMD capacitors? It seems like something else could be wrong with the board... because I replaced the capacitors with Can capacitors and I heat up the same spot on the board and it works... Could be that those capacitors aren't working correctly though...

PS, I did not screw up the board by removing the tantalum SMD caps. I just took them off with my solder gun, very carefully, and replaced them with 47UF 25V Can shaped capacitors from various boards I have laying around.

The Su'scon you tried could well be bad with high ESR, or just be too high ESR for this application. Heating the area would drop the ESR which might be why it fixes the problem again - you may have replaced one heat-sensitive capacitor with another!

Try a brand new, low ESR, good brand capacitor instead of a used and possibly defective Su'scon.

[Terryfictv]

Re: Samsung LN46A550 Power Cycling

Cap replacement is most reliable with 47@16v TANTALUM type !
Jumping,paralleling or bridging the bad cap adds capacitance but
still allows the AS7 on the board to cause a problem. So,the best
repair is to replace both.

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

PS, I did not screw up the board by removing the tantalum SMD caps. I just took them off with my solder gun, very carefully, and replaced them with 47UF 25V Can shaped capacitors from various boards I have laying around.

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

The old SMD capacitors are not on there anymore... I can replace the Su scon but I don't know what to test from there? Should I just order those SMD capacitors? It seems like something else could be wrong with the board... because I replaced the capacitors with Can capacitors and I heat up the same spot on the board and it works... Could be that those capacitors aren't working correctly though...

[Agent24]

Re: Samsung LN46A550 Power Cycling

Are the old SMD capacitors still on there?

Could be your replacements are not good enough. And I wouldn't use Su'scon, they're horrible....

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

Replaced both of them and still no dice... replaced with can 47uf caps... still turns on when I put hair dryer in the area...

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

So can I just take the surface mount one off and put a 47uf 10v or 16v on there?

[Andrew F. Ali]

Re: Samsung LN46A550 Power Cycling

The electrolyte in C131 is probably crystalline and when it is heated it turns liquid again and the capacitor start to work.

[budm]

Re: Samsung LN46A550 Power Cycling

The c131 will be tougher due to not much pads for soldering.

[zdsh07p9]

Re: Samsung LN46A550 Power Cycling

I scraped off some green stuff down to the copper on either side of c102 and soldered it to that haha