Quick Samsung PSU Capacitor Question...

[urbis]

Hello,

I'm looking at a friend's Samsung TV with bulging caps, however, as seen on the picture below, the two on the right hand side are 820uF, which seems to be awkward to find:



Looking at the bottom of the board, they seem to be wired in parallel, therefore, my question is which would be best:



1x 1000uF Cap replacing one, and a 680uF cap replacing the other.

Or

2x 1000uF Caps

Cheers!

[tautech]

As they are straight after the rectifier diodes and subject to a good amount of ripple, I would select good  quality Low ESR, high ripple 1000 uF replacements.
If physical size of diameter looks tight, get taller if you have the clearance.
Check there is sufficent voltage headroom also, manufacturers run caps too close to their rated voltage IMO.
We do ourselves no favors by skimping on a repair of this type.
Get some extras.....you will use them.

[justanothercanuck]

I would go with 2 1000uf caps, they're a common value, so they're easy to stock up on. 

[urbis]

Had a couple of 1000uF caps lying around, now up and running.

Cheers guys.

[tom66]

Just a note with these Sammy's, replace every single capacitor on the secondary. They are all bound to fail sooner or later.

[T3sl4co1l]

More is almost always better.  The only reason it might not be, is if it screws with the power supply controller's response time (and it breaks into oscillation or something bad like that).

For the same reason, high performance, low ESR caps may not be ideal, either -- these sorts of circuits are a triumph not only of engineering to a cost, but to a time as well!

Tim

[Yago]

More is almost always better.  The only reason it might not be, is if it screws with the power supply controller's response time (and it breaks into oscillation or something bad like that).

For the same reason, high performance, low ESR caps may not be ideal, either -- these sorts of circuits are a triumph not only of engineering to a cost, but to a time as well!

Tim

Is that a case of searching for the ESR specs of mystery caps, or is there a rule of thumb?

[tom66]

I have always used Panasonic FC/FM/FR as they are good midrange caps and never had an issue, probably 20 PSUs recapped now, if not more, all worked first time (when the caps were the fault)