I believe this is an x2 1uf 450v but not 100% sure. Tried to locate one and didn't have much success. Is anyone familiar? These are on a power board from a Vizio set.
thanks,
rich
thanks,
rich
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Re: Trying to locate this safety cap
its not X2 or it would say so - although it probably should be! -
Re: Trying to locate this safety cap
1uf filmComment
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Re: Trying to locate this safety cap
What is wrong with the cap? it is likely ok.Comment
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Re: Trying to locate this safety cap
I have one that failed open, tested out of circuit. As I stated, I know what it is, just not able to locate a replacement other than 400v.Last edited by repair-it; 07-15-2021, 09:43 AM.Comment
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Re: Trying to locate this safety cap
As stj said, it's not an X2 rated capacitor. If it were it would be covered with safety agency approval markings. Maybe look into 630VDC rated film capacitors. 450V is an odd rating in my experience.PeteS in CA
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Re: Trying to locate this safety cap
It is just a film cap across the bridge rectifier DC side, to suppress high frequency from the pfc circuit. But if you want a link to the original, here is one:
Here is a link to the original https://www-taobao-com.translate.goo...o=ajax,sc,elem
They call it a safety cap but is not.
Digikey has lots of 1µf 450vdc film capsLast edited by R_J; 07-15-2021, 01:50 PM.Comment
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Re: Trying to locate this box cap
ok, thanks for that info. I'm curious how you found it (China original). I tried for hours on Google.
I was considering the higher voltage version and maybe an X2 version. I have one of these that is open on the AC side and wasn't sure it was contributing to the flickering back light shut down issue, so I was considering my options as I go down the rabbit hole on this one. Possibly the IC LED driver is bad. 3 supposedly good boards - weren't- and when I finally got a good working one, I'd like to figure out where the fault is on the original since the good board fix the flicker issue.Last edited by repair-it; 07-15-2021, 03:04 PM.Comment
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Re: Trying to locate this safety cap
May be this is a cost down safety cap without proper certification approval, a sign of Chinese cost down product.Comment
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Re: Trying to locate this safety cap
backlight issue is almost always the leds going bad.Comment
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Re: Trying to locate this safety cap
Yes, that was my first thought but they tested ok (tester isn't a guarantee) the behavior when the set was turned on seemed more like a shut down due to an over voltage (short) condition and once I put a working power board in, that cured the back light problem. LED driver IC is built into the power board and it may have failed on the original board, still testing that board for faults and comparing it to the working board. Legitimate working boards for this set are in high demand & hard to come by.Comment
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Re: Trying to locate this safety cap
450v is not odd rating at all. 230x1.44(square root 2) means that the amplitude of the voltage in 230V AC grid(230v effective) can go up to 331.2V. If the device is not region specific and can operate from 120 to 240V, then 450V is ideal capacitor voltage. In worst case scenario can be eventually replaced with 400V if you know that the peak voltage wont go beyond 380-390VLast edited by televizora; 07-18-2021, 02:04 AM.Useful conversions. I don't "speak" imperial. Please use metric, if you want to address me.
1km=1000m=100000cm, 1inch=2.54cm, 1mile=1609.344meters, 1ft=30.48cm 1gal(US)=3.785liters, 1lb=453grams, 1oz=28.34gramsComment
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Re: Trying to locate this safety cap
but what if it has a pfc voltage booster?
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Re: Trying to locate this safety cap
1. The capacitor which the author mentioned is most likely input noise filter capacitor. Have to see a picture of the whole board.
2. There are different types of PSU-s. There are quite a lot with serious PFC circuits, other are with much simpler design.
There are PSU-s with simple filter capacitors after the rectification stage, there are some with serious APFC circuits.
In some cases 450V can be replaced with 400V. In other cases - it cannot be replaced with 400V. Depends.
If PFC voltage booster is used, then 450V is a must and cant be replaced with 400V.Last edited by televizora; 07-18-2021, 10:09 AM.Useful conversions. I don't "speak" imperial. Please use metric, if you want to address me.
1km=1000m=100000cm, 1inch=2.54cm, 1mile=1609.344meters, 1ft=30.48cm 1gal(US)=3.785liters, 1lb=453grams, 1oz=28.34gramsComment
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Re: Trying to locate this safety cap
This is very likely an RFI filter cap. Open filter = excessive line noise. Excessive line noise = weird and generally bizarre behavior, up to and including microprocessor lockups, watchdog timeouts, and/or firmware corruption. Change the filter and see if problems disappear.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
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Re: Trying to locate this safety cap
Figured out the 'flickering back light' issue. The Regulator shunt AS431BZ was bad. It was almost the last component to be tested as I went down the rabbit hole on this one - a good lesson though.🤔 Vizio e601i-A3. Board dated 7/13/12. Unfortunately, the panel is/went bad.Attached FilesComment
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Re: Trying to locate this safety cap
interesting,
i'v never seen a 431 fail personally.Comment
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Re: Trying to locate this safety cap
Well, if I tested it properly? As suggested in this article - I did get a small reading when I tested the last step. I assume when he says no reading, my meter should not move at all?
https://jestineyong.com/how-to-test-...gulator-tl431/Comment
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Re: Trying to locate this safety cap
Well if replacing the TL431 got your device working again it can be a safe bet that was it.
But if you are interested in testing it properly you need to build a small circuit with it.
This was the simplest one I managed to find with a quick search:
https://diodnik.com/en/kak-proverit-tl431/"The one who says it cannot be done should never interrupt the one who is doing it."Comment
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Re: Trying to locate this safety cap
Interesting...thank you, always learning.Comment
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Hi everyone,
I'm working on repairing a Pilz PNOZ X4 safety relay module. When I opened it up, I found some of the connector pins detached from their pads. I replaced the connector with individual wires, but the issue remains.
The module is set to dual-channel mode with manual start. In this mode:- Y36-Y37 and Y1-Y2 are bridged.
- 24VDC is applied across A1-A2.
- It monitors two emergency circuits (S11→S12 and S11→S52).
- When both are closed (24V present on S12 and S52) and the start button is pressed (S33 connected to S34), the NO contacts (13-14, 23-24, 33-34)
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anyone heard of these caps before? at first glance i mistook them to be Elna caps but closer look and it was elite. not sure if they are known failure prone brand.
also they are 47uf and 450v. why are they so large in height? i can get replacement 450v 47uf caps that are a quarter the height. what am i missing here?
if i were to replace them what should i be looking for?
they are on the power board of a toshiba (vestel) tv power board.
pic attached... -
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