Re: Bad capacitors: where from?
With electrolyic capacitors, there's the old saying: You get what you pay for.
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Re: Bad capacitors: where from?
I dont know much about this only what I read on here - those that really know their stuff may chime in later.
A lot of people use higher voltage caps but I dont think its because they run cooler. They may last longer as they can withstand higher voltage peaks.
Definitely you should use 105°C caps as against 85°C caps and if its hot running even 125°C caps
You say you have tested your caps but if that is with a capacitance meter only and not an esr meter the results can be misleading.
There are reams and reams of posts on here and the things that always come out are that it is the design of the circuit and the physical layout of the components that has most efect on the capacitors. In some circumstances even best brand caps fail because of where they are positioned and it is always difficult to establish just how long they have been run for.
I think Samvha should read Samwha and you are correct even the medium to poor brands you mention are conterfeited and sold on ebay.Leave a comment:
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Re: Bad capacitors: where from?
Thanks, but I see from another thread that opinions very much vary. It also seems to depend on the value?
The ones which I'm removing with obvious physical signs of damage are Samvha branded. The exact same brand which a reputable national English supplier supplies! (Amongst others)
Also, I suppose, some could be fakes?
My inclination is to use higher voltage values. I can't see any disadvantage in this and presumably they should run cooler and thus last longer?Leave a comment:
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Re: Bad capacitors: where from?
Aishi - Average quality, I'd rank them as "not too bad".
Yageo - Same as Teapo I think, poor quality
Luxon - Probably G-Luxon, which is same as Teapo, so poor quality.
Leaguer - Never heard of them, so I automatically consider them bad. I may be incorrect, they may be fantastic, but that would be very unlikely.Leave a comment:
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Re: Bad capacitors: where from?
Bluntly, yes.
They could be ok for a piece-of-trash psu, or one that you intend to give to an enemy.
For good brands, or own use, they are not suitable.Leave a comment:
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Bad capacitors: where from?
Being a cheapskate, I've bought some bargain electrolytic capacitors from Ebay! I got the high temperature ones, but I didn't think to ask about the make.
The ones I've got are branded Aishi, Yageo, Luxon and Leaguer.
I know historically capacitors of some brands from China had problems. What is the situation now? Are there still such Chinese or Tiwanese brands to be wary of?
The values seem ok according to a capacitance meter
As they are generally to be used in power supplies, have I made a mistake?
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Hi, I have some 32 bits computer motherboards that need repair, as they fail to
power on.
Here are some examples :
(N.B. "capacitors" indicated here are electrolytic capacitors located in the onboard
switching supply area).
(N.B. #2 : I could not find a 3300 microF aluminum-polymer with a higher voltage
than 6.3 V.)
1 - Motherboard #1 : this is an Asrock K7VT2 (socket A) that still works well. To put it on test
I replaced capacitors with aluminum-polymer.
3300 microF/6.3 V. x 4 replaced by 3300 microF/6.3 V. (KYOCERA... -
hey all, iv got my favourite battery charger here which iv had for many years probably 15 years now or maybe even more. it still works good but thought id open it up to clean the dust out of it, lots of dust inside but now its clean and noticed 4 capacitors inside it and wondered if i should replace them.
it has inside:
2 x 47uf 16v caps 105c branded as Su'scon (lol sounds sus to me)
2 x 470uf 16v LZ105c branded as G.Luxon
not heard of these brands are they any good?
iv attached photos of the charger and the board inside for an idea on the type of... -
I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
After all of... -
I have a 2007-era Panasonic VHS combo that is full of of Elna RJG capacitors. I am trying to test the capacitors to diagnose the machine and then select replacement capacitors but I can not find any datasheets for them. I did find a Elna catalogue from 2007-2008 but there is no mention of this capacitor series. Where these specially made for Panasonic and so not made available to the public? Any ideas what to find out what the ESR values should be without the datasheets? They are all between 10V and 50V and 47uF and 1800uF. None are leaking or bulged but I know that they need to be tested to be... -
I picked up a 70" Samsung UN70TU7000WXZA. The original owner said they were watching it when the power surged and knocked it out. I pulled the back off the TV and disconnected the main board from the power board, and the LED backlight came on, which I was told meant the power board was good. When everything is plugged in the standby light will not come on, looking at the main board BN94-17775A with a thermal imaging gun I can see one of the chips labeled 3202 is 251 degrees F just sitting idle. I found a replacement board, BN94-16115X; this board has the same symptoms, except it is a different...
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