Vizio VO47L caps

[nt40lanman]

Hi All,

I got this TV free off CL. I was told the power supply was a problem but it ran for 6 hours without a problem. The Power board has the same bad cap as others have described and a fairly good burn on the board. Also I read about the caps on the inverters and, surprise, they are bad too so I'm going to replace them. Does anyone have a really good close up of the back of the Power board under the induction coils? I don't have a problem hand wiring a repair but I'd like to know what it started like.

I ordered these caps from digikey.
(1) Panasonic EEU-EB1V471 (PS)
(4) Panasonic EEU-FR1V681 (Inverters)

How am I doing so far? I don't see any other problems but are there any other problem spots to check out?

[budm]

Re: Vizio VO47L caps

We cannot tell much sine there is no model number or pictures of the board. It is best to replace the whole set of caps except the large main filter cap in the primary side which rarely goes bad.
470uF 35VdcEB series is NOT low ESR type which is required for SMPS power supply.
http://www.mouser.com/ProductDetail/...9rygpOOw%3D%3D

https://cdn.badcaps-static.com/pdfs/...6f0b579b29.pdf

[nt40lanman]

Re: Vizio VO47L caps

Do these pics help?

[nt40lanman]

Re: Vizio VO47L caps

Do these pictures help?

[nt40lanman]

Re: Vizio VO47L caps

Sorry for the double post

[dick_barton]

Re: Vizio VO47L caps

The two inductors (coils) look as they have been producing enough heat to carbonise the circuit board and carbon is a good conductor of electricity. It may well be due to the inductors requiring resoldering and I'd scrape as much of the carbon off as possible around the inductors.

[nt40lanman]

Re: Vizio VO47L caps

OK, thanks. I had to cut away charred board on a fix once.

About this 470 cap I have ordered that isn't "low ESR". Are most caps "low ESR" or not? I have a local place I can score a cap from. Would they be labeled "Low ESR"?

[budm]

Re: Vizio VO47L caps

Not all caps are LOW ESR, you have General purpose cap and then you have low ESR cap for SMPS.

[nt40lanman]

Re: Vizio VO47L caps

How does this look? And it's higher temp!!

EEU-TP1V471B

[budm]

Re: Vizio VO47L caps

I use FM/FR series for all my repair works.
FM has better spec as far as ESR and ripple current compared to PT series.

[nt40lanman]

Re: Vizio VO47L caps

What happens if I put in the cap I have until my new one comes in?

[budm]

Re: Vizio VO47L caps

It should work for now, but you are just replacing juts that one 470uF/35V right? That 24V section has many 35V filter caps on it, it is 24V high current power supply section, C240A, C240B, C241.

[nt40lanman]

Re: Vizio VO47L caps

Yes, for now I'm just planning on that one cap in the PS as well as the 4 on the Inverters. The others in the PS show no sign of problem at all. I thought I might throw that cap in (and the inverter caps) to watch football tomorrow on it!!!

[budm]

Re: Vizio VO47L caps

Yes, for now I'm just planning on that one cap in the PS as well as the 4 on the Inverters. The others in the PS show no sign of problem at all. I thought I might throw that cap in (and the inverter caps) to watch football tomorrow on it!!!

You cannot tell by looking at the cap, you need to measure the capacitance and the ESR, that 470uF cap is in the output side of the Pi filter, the other 2 at the input side of the pi are probably bad too.

[nt40lanman]

Re: Vizio VO47L caps

I put in the inverter caps and will wait for the PS cap to show up. I'm going to put that in and run it, and pick up the other caps in the PS when I get a chance. Do you think they are Low ESR as well? No rush as it worked before I took it apart.

Thanks to everyone for your help and suggestions. I knew nothing of Low ESR Caps.

[budm]

Re: Vizio VO47L caps

They are all LOW ESR.
BTW, those inductors got very hot were due to high frequency AC (inductor will block AC so more Vdrops are appear on the indcutors) because of bad filter caps, so I will not be surprised that the caps C240A, C240B in the input side of the pi filer are not doing their jobs to filter out the AC.

[nt40lanman]

Re: Vizio VO47L caps

Now I know how other people feel when they wonder how I know so much about computers!!

I called my local place and they didn't seem to have a lot of knowledge on low ESR. I'm going by that way so I'll check in and if they don't have C240A and C240B, I'll order. You seem to prefer Mouser.com but I used digikey.com. Is there a big difference or is it HD vs Lowes?

C240C and C240D aren't involved here? they appear the bridge the same gap electrically.

[budm]

Re: Vizio VO47L caps

I use DIGIKEY most of the time.
I do not see C240C/D in your pictures.
https://www.badcaps.net/forum/attach...7&d=1474050378

[nt40lanman]

Re: Vizio VO47L caps

Sorry, I wanted a close-up to get good detail. The solder points at the bottom of the pic are for those 2 caps. I'll get 4 and replace them all. Right now I have it up and running on the non-low-esr C241 and it seems to be running a LOT cooler than it did when I first tested it!!! Will leaving he back cover off until I get all the caps I need screw up the cooling?

[nt40lanman]

Re: Vizio VO47L caps

Related or unrelated, I have been watching it for a couple hours. I just noticed I have 7 evenly spaced small black spots at the top of the screen