12v PSU Cap Change Suggestions

[stu2007]

Hello, I have a Digimate LCD monitor which started going black screen intermittently then after we had a power cut died completely.
It has an external PSU, Wearnes WDS050120. Output is 12v 4.16A. It was sealed but using a subtle blend of psychology and extreme violence I managed to split open its case.

It had one Teapo 1000uf 16v output cap which was bulged and after finding no other obvious faults I replaced it with a cap of the correct value and the PSU came back to life.

It has the following caps, all Teapo A3 105 deg dated 2005:
100uF 400v on the input side
220uF 25v on input side
100uF 25v on output side
2X 1000uF 16v on 12v output

Since Teapo are not good I am looking for suggestions for all the caps please.

Stu

[PeteS in CA]

Re: 12v PSU Cap Change Suggestions

I'm not sure of Teapo's reputation on input cap series (i.e. the 400V cap). I'd be inclined to leave the existing part in place, but would defer to the opinions of folk here with more and direct experience. As to the output caps, they're ~8 years old, not ancient, but they've lasted a decent amount of time. I'd replace them all. Start by finding what Teapo series they are, the characteristics of the parts you need to replace - use the same case size and match the impedance and ripple current ratings. My guess would be that you'll be needing parts from the PW, LXZ or FC series (Nichicon, Nippon (or United) Chemicon, and Panasonic, respectively) or HE, KZE or ZL series (Nichicon, Nippon (or United) Chemicon, and Rubycon, respectively). I don't see an "A3" series in Teapo's current online catalog. Stick with Nichicon, Nippon Chemicon, Panasonic or Rubycon.

[Wester547]

Re: 12v PSU Cap Change Suggestions

^"A3" isn't a series from Teapo, it's a batch code, just like "A3-T1/T2/T3" is, along with "C2/3", etc. I would guess that the OP's Teapos were either SYs or SCs, so your suggestions would be a good replacement for them (monitors tend to run hot so PW/LXZ/FC sound like the way to go for me).

[PeteS in CA]

Re: 12v PSU Cap Change Suggestions

Good call, Wester! I'm accustomed to simpler YYWW or WWYY datecodes (sometimes with an extra character that probably denotes the factory) or the more complex and cryptic codes such as STMicro or IR use on their MOSFETs, which include the date, the country, the factory and possibly even which line at the factory. Personally, I wish companies would stick to the 4-digit datecode plus character(s) for the factory; I don't like having to have a unique "decoder ring" for every vendor if you need/want to figure out the age and origin of a part.

Were I doing repair and refurbish work like many of you all do, I'd be tempted to use PW, LXZ or FC for low voltage GP replacement - i.e. wherever a specialty part or lower impedance part are not needed.

[stu2007]

Re: 12v PSU Cap Change Suggestions

My mistake, looks like they are SC's. Sorry guys but thanks for the replies.