Samsung 2232BW cap is it 2.2 or 22?

[tombodude]

Just got this 2232BW and recapped everything on the power board. It worked about 15 minutes then died; could restart it by turning power off and on but it would not stay on more than some seconds; then it wouldn't power off at all until I unplugged it.

I have done this a bunch of times, and the board did not pop any of the new caps, but I have a question I really need help with; the small cap at C118 on the power board IP-45130B looked to me like a 2.2uf 50v. However, it was not clear to me, only one line was visible. I replaced it with the same thing. But, when I look at the posts in this forum and the cap kits online, they all include or state that this is a 22uf, not 2.2. Can anyone tell me for sure which is the correct one? If it is a 22, I have one to replace the 2.2 I used on it. Pictures below. Thanks for your help! Nothing was blown when I took it apart again.

[selldoor]

Re: Samsung 2232BW cap is it 2.2 or 22?

I dont know but if you believe your enquiries lean toward it being a 22uf 50v
I would just get one and try it - wont do any harm.
What make /series caps have you used - they should be good make low esr on a power supply board

I can see you have used good panasonic caps for the larger ones but assume you ordered the wrong size as they are bent over - That will not produce best results
- they should be as close to the board as possible (But I guess they are)

[Gariarto]

Re: Samsung 2232BW cap is it 2.2 or 22?

I have the same board right here, This boards' original is a Sam Young KMG 50V 22uF and its the only value of its type on the board.

Selldoor is correct about leaving long leads not being a good idea. Right now I can't remember the thread # but the experts claim it slightly alters the properties of the capacitor.

[tombodude]

Re: Samsung 2232BW cap is it 2.2 or 22?

Thanks, all. I'll replace the cap with a 22uf and see if I didn't cause any other damage. I thought the too long caps not ideal, but there are only two places in my area one can walk in and buy them; they both had the same size. I guess I'll have to order some. I'll let you know if the repair works.

[Gariarto]

Re: Samsung 2232BW cap is it 2.2 or 22?

You're most welcome

[tombodude]

Re: Samsung 2232BW cap is it 2.2 or 22?

Update - replaced the suspected 2.2uf cap with a 22uf cap; it worked for a little while then crapped out as well.

I bought a new power board from China, got it today, and installed it and it works fine. But, FYI, the cap on the new board is also a 2.2uf and NOT a 22uf. There may be different revisions of this board but beware and look for the little dot between the 2's on this tiny cap.

I don't know that this caused any new problems on the old board, it may have had other weak/failing parts, but wanted to update this thread with what I just found out.

[PeteS in CA]

Re: Samsung 2232BW cap is it 2.2 or 22?

Right now I can't remember the thread # but the experts claim it slightly alters the properties of the capacitor.

It has to do with the difference between "ESR" (Equivalent Series Resistance) and "Impedance". "ESR" is the sum of the resistances of the lead wires, the swages of the leads onto the foils, the foils, and the electrolyte. "Impedance" is the vector sum of the "ESR" and the "ESL" (Equivalent Series Inductive reactance). Reactance is the AC-only analog of resistance, and can be due to capacitance or inductance. "ESL" is the net inductive reactance of all the parts of the capacitor listed above. Increasing lead length increases both the ESR and the ESL, but ESL more so than ESR. Impedance isn't that big a deal for some general purpose usages, but for power supply and VRM O/P capacitors, higher ESL will result in higher noise, specifically (IIRC) noise spikes and the ramp in the ripple voltage waveform (i.e., if a cap had no relevant ESL and your measurement method were near perfect the ripple voltage would be a square wave).

[Gariarto]

Re: Samsung 2232BW cap is it 2.2 or 22?

Thanks for that Pete, valuable information.

[tombodude]

Re: Samsung 2232BW cap is it 2.2 or 22?

Update: after I ordered a batch of nice low-ESR caps, I replaced the General purpose 2.2uf I had in there with a LeLeon low-ESR (all mouser had in that size) and put it all back together again, it fired up and has worked perfectly since. Success! I now have learned the lessons of not using strictly low-ESR caps for these repairs. Thanks to all!

[PeteS in CA]

Re: Samsung 2232BW cap is it 2.2 or 22?

Can't say I have high regard for Lelon. But in a P/S it'll probably be OK.

[selldoor]

Re: Samsung 2232BW cap is it 2.2 or 22?

Well done - thanks for the update.

[LLLlllou]

Re: Samsung 2232BW cap is it 2.2 or 22?

Update: after I ordered a batch of nice low-ESR caps, I replaced the General purpose 2.2uf I had in there with a LeLeon low-ESR (all mouser had in that size) and put it all back together again, it fired up and has worked perfectly since. Success! I now have learned the lessons of not using strictly low-ESR caps for these repairs. Thanks to all!

Lelon are garbage. They will probably last a few years, but if this is a high stress part, they will eventually fail too.

Try this:

http://www.digikey.com/product-detai...1595-ND/756111

Digikey carries UCC KY and KZE series which are perfect replacements for most, if not all, of the caps in power boards in most LCDs. They have great endurance, great specs, aren't too expensive, and come in most sizes and values. Also Digikey has much better shipping charges than Mouser for small orders.

When replacing caps in a PSU, always look up the specs of the originals, and make sure the replacements have the same or lower ESR/Impedance, and the same or higher ripple current ratings. Also, as you have found out the hard way, the same or smaller physical dimensions.