Suggestions to UpGrade Power Supply?

[KenOlson]

Received a Samsung UN32EH4003FXZA LED TV with starting problems.

From experience with this model guessed it had bad cap(s) so checked the Power Supply and found the 47uF 160 V cap starting to bulge. The adjacent 47 200 V cap and all the other caps are OK.

I would like to upgrade the failing 47uF 160 V cap so appreciate any suggestions.

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

Forgot to mention that have searched the Internet to check if anyone has determined why these 47uF 160 V caps are failing but to date have found nothing.

My 1st guess is since this is an inexpensive TV, Samsung was trying to save money on caps.

Am thinking about upgrading this cap to 200 V as radiotvnut posted "Samsung 32" from 2012 (easy fix)" http://www.videokarma.org/archive/in.../t-264566.html


Am also wondering if it is worthwhile to use a low ESR, long life,... cap?

Appreciate any suggestions.

Thanks

[budm]

Re: Suggestions to UpGrade Power Supply?

http://www.samwha.com/capacitor/company/com.aspx

What is the series of that SAMWHA cap?
It is not easy to find 47uF 160/200VDC LOW ESR cap which should be used for that filter cap for the LED driver circuit..

[stj]

Re: Suggestions to UpGrade Power Supply?

it says WL on it.

[R_J]

Re: Suggestions to UpGrade Power Supply?

I would guess the additional heat from the transformer located below it helped cook it as the other 47/200 looks in better shape.

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

budm,

"It is not easy to find 47uF 160/200VDC LOW ESR cap which should be used for that filter cap for the LED driver circuit.."

Question: If can find a suitable cap, do you think a LOW ESR cap is worth while in this circuit?

Thanks

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

R_J,

"I would guess the additional heat from the transformer located below it helped cook it as the other 47/200 looks in better shape"

Any suggestions to overcome this problem?

Thanks

[budm]

Re: Suggestions to UpGrade Power Supply?

That LED driver power supply is switching power supply so the replacement has to be LOW ESR type, you can also get the spec of the SAMWHA WL series cap to find something that will match the original spec.

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

budm,

"That LED driver power supply is switching power supply so the replacement has to be LOW ESR type, you can also get the spec of the SAMWHA WL series cap to find something that will match the original spec"

Thanks for the tip! Did (attach 1) Big question is if SAMWHA caps meet their own specs. Since got this TV have been searching for successful repairs. Seems any general replacement switching power supply cap will work for some time. Even SAMWHA 47uF 160 V cap lasted for 4+ years.

What I would like to do is replace it with something what will Never Fail!

A recent post I found is "Samsung LCD TV LN-T5265F Black Screen Diagnosis Help" by gonefishin09 http://www.cnet.com/forums/discussio...s-help-359389/ at "more info on faulty Samsung / Samwha capacitors" mentions "I found an almost exact specification match with the Nippon Chemi-Con KZE series http://www.chemi-con.com/files/KZE.pdf"

While the max V of the KZE series is too low I have more confidence in Nippon Chemi-Con caps!

Hope that US Chemi_Con http://www.chemi-con.com/data-sheets has same reliability!!! Am I correct? Any comments?

Have found KXL EKXL401E□□470MJ40S (attach 2) have not checked all the series caps specs yet) this may be overkill and also need to check if will fit. Same for EPAG401E□□470MK30S (attach 3).

Maybe best to just get a 200 V switching power supply cap???

Thanks again for all your help!!!

[tvtimmy]

Re: Suggestions to UpGrade Power Supply?

Maybe lay the new cap on its side under the bn44...... there seems to be enough open space. I admit, I've done it before (when I could only get axial caps,or replacements were too big).Glue it down with some hi-tech RTV sillicone.

[ReeceyBurger123]

Re: Suggestions to UpGrade Power Supply?

Replace all Wl, Wb, Xc and Pt series caps if your supply uses then defective caps and fail alot.

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

tvtimmy,

"Maybe lay the new cap on its side..." Thanks for the tip! May have to do it.

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

budm,

"It is not easy to find 47uF 160/200VDC LOW ESR cap..." Agree have checked a few US cap datasheets and more difficult than 1st thought.

Am wondering if Max ESR 5.291 is acceptable? To date the best I have found is 3.60 (All rated at 120 Hz and 20 C).

Also consider myself a beginner concerning Power Supply Caps so appreciate any suggestions.

From previous mention am guessing life expectancy for these caps is determined by max Voltage, Temp, ESR...

Thanks again everyone for your comments!!!

[KenOlson]

Re: Suggestions to UpGrade Power Supply?

ReeceyBurger123,

"Replace all Wl, Wb, Xc and Pt series caps if your supply uses then defective caps and fail alot"

Have done a lot of searching about problems with this Samsung LED TV Power Supply and if caught early the 47 uF 160 V cap is always the one that fails.

I intend to keep a close check on this PS so want to upgrade the 47 uF 160 V cap and hope this will eliminate any other cap problems.