Samsung pn50a550s1f

[Jtroutt19]

Ok guys so i got this tv at my work fairly old and heavy as a son of a gun. Opened up found bad caps on the ps board on DC side. Replaced those. Did not replace caps on the AC side or the vscan board or the other boards. Tv is still having its issue. Original customer issue was it would take the tv a long time to turn on. It power cycles itself sometimes coming on for a brief second. Sometimes outputting a high pitched squel from the speaker. And sometimes displaying a random color on one side of the screen.

In the original inspection i missed a bad cap on the vscan board. So i unplugged the vscan and the board to the right of the ps. The unit will still power cycle and letnout schreeching squeal. And ideas on this. Thanks for any input.

[budm]

Re: Samsung pn50a550s1f

C102 on the main board.
https://www.badcaps.net/forum/showth...a550s1f&page=3
https://www.badcaps.net/forum/showth...a550s1f&page=2

http://www.shopjimmy.com/samsung-bn9...a550s1fxza.htm

[Jtroutt19]

Re: Samsung pn50a550s1f

Should I just replace the cap or should I replace the IC as well. Also how you diagnose something like this for future reference. Thank you for your response.

[budm]

Re: Samsung pn50a550s1f

I myself only replace the C102. You can also try parallel it with 100uF 16V low ESR to see if the problem will go away. i have done so many of these A550 boards.

[Jtroutt19]

Re: Samsung pn50a550s1f

Awesome thank you will try replacement tomorrow. What value is that cap? And how do you know values of those caps once on board witout a service manual?

[budm]

Re: Samsung pn50a550s1f

C102 (NEC-TONKIN, the code is printed on the body of the cap, see PDF for spec) is Polymer cap 47uF 10V: see post 128, 129 for DIGIKEY P/N.
https://www.badcaps.net/forum/showth...t=25810&page=7

[Jtroutt19]

Re: Samsung pn50a550s1f

Thanks man I found a Kemet equivalent since we use Mouser at my place of employment. Mouser

It kinda sucks cause we dont need anything else at the moment and we are gonna have to pay for shipping on one item. Unless someone could recommend some of the basic caps sizes and rating to have in stock at all times.

[budm]

Re: Samsung pn50a550s1f

Just for testing you can put in low ESR lytic cap 100uf 10V or 16V to see if the problem will go away.

[RobsFLHTC]

Re: Samsung pn50a550s1f

My Samsung pn50a550s is having the same issues. After searching through many videos and Google searches I found this site. You guys ROCK! I should be getting the replacement cap next week. Thanks again!