Question broken pin of big filter capacitor 330uf 120v fix?

[meganin]

hi i was trying to fix a power supply .. in the process i got angry and threw the power supply ,which plucked the big capacitor and its expensive for now.. but i tried to put it back inserting the remaining pins into the capacitor.it gives me reading of a good capacitor..will it be ok to power on that capacitor in future? please refer to the pics

 

[meganin]

also please tell what alternative i can use if i dont get this exact capacitor values.thanks

 

[C1]

That's a pretty common cap. You should be able to pick that up at Fry's Electronics. Ebay has a set of them for just a few dollars w/ Free shipping, but because it's shipped from Hong Kong, it might take awhile.

https://www.ebay.com/i/252301334283...MIu-6ijrmE6AIVi9lkCh3y-wA3EAQYBCABEgKuxfD_BwE

Also, a 300uf to 400uf should be okay, but if so I would replace them as a set. Just make sure that the voltage is 250v or more.

You could also try an electronics repair shop, but I bet that they'd hit you for too much.

 

[UsandThem]

hi i was trying to fix a power supply .. in the process i got angry and threw the power supply ,which plucked the big capacitor

Just when I though I'd seen it all over the 20 or so years I've been on this site, that's a first.

 

[mindless1]

That PSU is junk, not worth fixing. Literally, when they don't even use the AC filter stage and have discrete diodes, it's a bottom of the barrel PSU so no wonder it failed. Further, I suspect you should not be working on anything that gets plugged into mains AC voltage.

No, it is not okay to just shove the pin back in (lol). I would not buy random generic caps on ebay unless that is your last resort. If you had told us where you're located, we might have been able to suggest an electronics supply house in your region, even a specific part #. In the US I'm partial to digikey because there is no order minimum and under (8oz?) a few ounces they will ship via the cheaper USPS carrier for about $3.

The first two things to do are measure the lead spacing, and measure the diameter because with them sitting right next to each other, a larger diameter probably won't fit.

Sometimes the off-brand capacitors have overly optimistic, even fraudulent capacitance ratings for their size, so if you cannot get a 330uF cap in that diameter and height, go with a taller capacitor.

I would have thought that you were already able to source parts, or else how did you expect to repair this PSU for whatever the (other) problem was?

Anyway, throwing a PSU hard enough to break capacitors off, may have left you with other broken solder joints, cracks in the PCB, or even stress on some component leads, particularly the transistors or diodes on the heatsinks. The entire PSU should be gone over with a magnifying glass and strong work light, except as stated initially, this PSU wasn't worth the time to try to repair at all.

Fortunately for you, since these caps only see 50Hz-60Hz frequency, the other specs of the cap don't matter much beyond at least 330uF and at least 250V. They're far less likely to fail if you pick a mediocre quality part, compared to the caps filtering the output on the low voltage side.

 

[meganin]

hi ,thanks for replying me,i fixed some local caps on them now.. and getting the same problem as before just 5vsb and no other voltages ,was fixing R23 resistor (smd) with through hole resistor,it worked but i wanted to try a better fix and spoiled it ! as solder point was big ,i spoiled the pads and lifted them all. now i am stuck with it..

 

[meganin]

i having some help from other forums as well,please dont mistake me..just trying to get help as much i can..thank you for understanding

 

[meganin]

anyone can help here?

 

[VirtualLarry]

Do yourself a favor, and dispose of that PSU, and buy another one. Seriously.

 

[meganin]

yup i have replaced it, but i want to make it work , interested in learning to fix things ;P

 

[VirtualLarry]

Well, you can do what you want, I guess, but I would only suggest that you "learn to fix things" (electronics), on devices that don't have LETHAL voltages and currents, like an older motherboard or something, not a PSU. That is all.

 

[meganin]

hi ,i have soldered back the missing link i guess.. but i dont know if the values are correct.. at one end of resistor i get 16v and other end i get 0.76v ,i get only 5vsb.. what parts should i change now..thanks for trying helping me

 

[meganin]

hi..would need little clarity on choosing substitutes by the ratings on
stth1002ct -this is Fast Recovery Rectifiers 200v, 8x2 16A,fv -1.25 V
stps2045ct - this is Schottky Rectifier vrrm -45v, 10x2 20A ,vf- 0.84 V

how nearest i can get a component less or high.. ,which parameters to choose ?

 

[meganin]

16v is going through a 1.5k/0.5w resistor,to h945p npn transistors then to driving transformer, reading of h945 p is short. i want to replace it,the shops here dont have it even after i say the values from data sheet ,they are so dumb. i am getting this ST2SC1815 for a cheaper price ,almost similar parameters except these 2 - ft is 250 for h495p ,80 for ST2SC1815 power dissipation is 250mW for h495p , 400mW for ST2SC1815
can i replace h495p with ST2SC1815 ? thanks

 

[Fanatical Meat]

Well, you can do what you want, I guess, but I would only suggest that you "learn to fix things" (electronics), on devices that don't have LETHAL voltages and currents, like an older motherboard or something, not a PSU. That is all.

^^^This!

 

[meganin]

hehe

 

[jonnyGURU]

This is a very, very cheap. Very poor quality power supply. Very old too. It's not worth it unless you're just trying to learn things, but as others have pointed out, messing around inside a PSU is potentially lethal. If I didn't know what I was doing, I would only feel comfortable doing it in a classroom setting with a very qualified EE teacher/professor.