Trying to locate this safety cap

repair-it · 07-14-2021, 03:58 PM

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

**stj** · 07-14-2021, 05:42 PM

its not X2 or it would say so - although it probably should be!

**petehall347** · 07-14-2021, 05:43 PM

1uf film

**R_J** · 07-14-2021, 07:12 PM

What is wrong with the cap? it is likely ok.

repair-it · 07-15-2021, 09:41 AM

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.

**PeteS in CA** · 07-15-2021, 12:34 PM

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.

**R_J** · 07-15-2021, 01:39 PM

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 caps

repair-it · 07-15-2021, 02:58 PM

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.

bestsystem · 07-16-2021, 01:54 AM

May be this is a cost down safety cap without proper certification approval, a sign of Chinese cost down product.

**stj** · 07-16-2021, 03:17 AM

backlight issue is almost always the leds going bad.

repair-it · 07-16-2021, 01:52 PM

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.

**televizora** · 07-18-2021, 02:02 AM

Quote:

Originally Posted by PeteS in CA

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.

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 380-390V

**stj** · 07-18-2021, 03:03 AM

but what if it has a pfc voltage booster?

**televizora** · 07-18-2021, 09:52 AM

Quote:

Originally Posted by stj

but what if it has a pfc voltage booster?

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.

**TechGeek** · 07-18-2021, 10:32 PM

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.

repair-it · 07-23-2021, 04:50 PM

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.

**stj** · 07-24-2021, 02:20 AM

interesting,
i'v never seen a 431 fail personally.

repair-it · 07-24-2021, 10:24 AM

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/

**Per Hansson** · 07-25-2021, 02:38 AM

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/

repair-it · 07-25-2021, 12:58 PM

Interesting...thank you, always learning.

07-14-2021, 05:42 PM	#2
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 26,399	Re: Trying to locate this safety cap its not X2 or it would say so - although it probably should be!

07-14-2021, 05:43 PM	#3
petehall347 Badcaps Veteran Join Date: Jan 2015 City & State: worcester My Country: United Kingdom I'm a: Knowledge Seeker Posts: 3,209	Re: Trying to locate this safety cap 1uf film

07-14-2021, 07:12 PM	#4
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 7,959	Re: Trying to locate this safety cap What is wrong with the cap? it is likely ok.

07-15-2021, 09:41 AM	#5
repair-it Member Join Date: Nov 2020 City & State: Long Island NY My Country: US Line Voltage: 120VAC 60Hz I'm a: Professional Tech Posts: 34	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 at 09:43 AM..

07-15-2021, 12:34 PM	#6
PeteS in CA Badcaps Veteran Join Date: Aug 2005 City & State: San Jose, CA My Country: USA, Unsure of Planet Line Voltage: 120VAC, 60Hz & 115VAC, 400Hz I'm a: Professional Tech Posts: 3,365	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 Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells. ************************** All that is gold does not glitter, Not all those who wander are lost; - J.R.R. Tolkien, The Fellowship of the Ring ************************ To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it. ************************** Laughable prediction, https://principia-scientific.com/doc...l-most-people/ ; Fully Vaxxed May 2021; Viva CallSJ "5K" (actually 3.26 miles), 9/19/21, 51:19; ZombieRunner Halloween 10K, 10/31/21, 1:49:30; ZombieRunner Quarry Lakes half marathon, 4:19:07, 12/12/21

07-15-2021, 01:39 PM	#7
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 7,959	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 caps Last edited by R_J; 07-15-2021 at 01:50 PM..

07-15-2021, 02:58 PM	#8
repair-it Member Join Date: Nov 2020 City & State: Long Island NY My Country: US Line Voltage: 120VAC 60Hz I'm a: Professional Tech Posts: 34	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 at 03:04 PM..

07-16-2021, 01:54 AM	#9
bestsystem Member Join Date: May 2011 Posts: 56	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.

07-16-2021, 03:17 AM	#10
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 26,399	Re: Trying to locate this safety cap backlight issue is almost always the leds going bad.

07-16-2021, 01:52 PM	#11
repair-it Member Join Date: Nov 2020 City & State: Long Island NY My Country: US Line Voltage: 120VAC 60Hz I'm a: Professional Tech Posts: 34	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.

07-18-2021, 03:03 AM	#13
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 26,399	Re: Trying to locate this safety cap but what if it has a pfc voltage booster?

07-18-2021, 10:32 PM	#15
TechGeek Computer Geek Join Date: Jan 2015 City & State: Nowhereland, Texas My Country: USA Line Voltage: 120/2/[email protected] I'm a: Hardcore Geek Posts: 1,989	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. My computer doubles as a space heater. Windows 10? Only if you like forced, buggy updates and 24/7 telemetry. Samsung = Seagate = Seatrash = Trashgate Don't buy Seagate drives. Don't use Seagate drives. If you have any in service right now, make plans to replace them ASAP. SMR = Slow Magnetic Recording Avoid SMR, buy CMR drives instead. SMR is easily a 15+ year step BACKWARDS in HDD speed. Permanently Retired Systems: RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.

07-24-2021, 02:20 AM	#17
stj Great Sage 齊天大聖 Join Date: Dec 2009 City & State: Europe My Country: some shithole run by Israeli agents I'm a: Professional Tech Posts: 26,399	Re: Trying to locate this safety cap interesting, i'v never seen a 431 fail personally.

07-24-2021, 10:24 AM	#18
repair-it Member Join Date: Nov 2020 City & State: Long Island NY My Country: US Line Voltage: 120VAC 60Hz I'm a: Professional Tech Posts: 34	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/

07-25-2021, 02:38 AM	#19
Per Hansson Super Moderator Join Date: Jul 2005 City & State: ---- My Country: Sweden Line Voltage: 230v 50Hz I'm a: Knowledge Seeker Posts: 5,049	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."

07-25-2021, 12:58 PM	#20
repair-it Member Join Date: Nov 2020 City & State: Long Island NY My Country: US Line Voltage: 120VAC 60Hz I'm a: Professional Tech Posts: 34	Re: Trying to locate this safety cap Interesting...thank you, always learning.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode