Main board Magnavox 32ME402V/F7

[beuknowsdiddly]

Hey everyone!
So I have a TV that just died. Magnavox 32ME402V/F7.
Pretty sure it's a bad capacitor.

I'm sure I found one that's bad using my ESR tester. But I have two questions.

The one that's bad according to my tester is a 25v 47 mocrofarad SMD aluminum cap. Soneone said I can't just use any general purpose cap. That I needed to know what series to get. I have no clue what cap to replace this with.

My second question is... I have one cap that's 4 volts, 330uF and another that's 6.3 volts, 220uF. My ESR (or MESR) Tester has a chart that starts at 10 volts. So how do I test those lower voltage caps. Is there a chart that would be useful with this tester? It's an MESR-100 esr meter.

Thanks for all your help!

Beau

[budm]

Re: Main board Magnavox 32ME402V/F7

Can we see the pictures of what we are dealing with? BTW, you should make new post in the TV section.
Also, did you test ESR with the caps removed from the board?

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Thanks for the response budm!!

Here's a couple pictures...

https://www.dropbox.com/sh/ktf8biovy...yHP5E3jGa?dl=0

I wasn't sure if I could upload them here or not.

I didn't desolder the caps, I tested them inline. But out of the 4, 25v 47uf caps, 3 read .710 and 1 reads 2.1 leading me to believe that one is bad since the chart on the meter says that particular one shouldn't read above 1.2.

and again, I don't what the lower voltage ones should read since the chart starts at 10v.

[R_J]

Re: Main board Magnavox 32ME402V/F7

Yes you can, and should upload the pictures here. Just use the go advanced and click on the paper clip.

Do you have standby voltage from the power supply ALL+3.3V/ALL+5.3v ? or any voltage from the power supply?

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Hey RJ,

Cool I attempted to upload them here. Hope it works.

As far as the power supply goes, I am an absolute novice and have no clue. I'm use to working on PC boards so when you say power supply I'm thinking "PSU" I know that's not what you're referring to but sorry I can't answer the question.

This is my first attempt at a TV board.

[budm]

Re: Main board Magnavox 32ME402V/F7

We need to see pictures of the whole backside of the TV showing all the boards, then good clear straight shot of the whole Top and bottom side of the power supply board which is the board we will want to test the Voltages first, the pictures must be clear enough to read the printed labels, designator as printed on the board.

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Got ya!

Here's a picture of the other board.. Power board?

Just to give you a little background. When I plug the TV in, it gives off a high pitched squealing sound. I found a video on youtube where the television did the exact same thing. When he unplugged the ribbon connecting the two boards, the squealing stopped. He then replaced one capacitor on the main board and voila the issue was resolved. So that's why I'm thinking maybe I have the same problem.

Here's the video. Mine is doing exactly the same thing. https://www.youtube.com/watch?v=uAFCTZCb1BA

If you need more pictures I will be happy to post them. Whatever you need. I REALLY appreciate all your help!

AND the only tester I have is an MESR-100 esr meter...… Tell me what other tester I should get and I'll order it ASAP!

[budm]

Re: Main board Magnavox 32ME402V/F7

Sounds like typical shorted SMD MLCC (not Lytics cap type) cap C3214 for the 21V Line on the main board, but there are other caps connected in parallel with C3214 as well, so you have have to remove several.
https://www.badcaps.net/forum/showth...light=elefw605
https://www.badcaps.net/forum/showthread.php?t=76666

Have all the boards connected back in place then use Ohm meter to check the resistance between GND and jumpers and report the reading: I suspect low Ohm reading on the P-ON 21V which is the one that failed often.
ALL 3.3V
P-ON +21V
Amp +13V

Your picture is not clear.
Is this your exact board?
https://www.shopjimmy.com/magnavox-a...upply-unit.htm
BTW, you cannot use ESR meter to check cap in circuit, it will never give you the correct reading because there are other components connected to the cap.

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Yes that board looks exactly like mine. The only difference is that board says

BA21FGF01 02 4 and mine is BA21FGF01 02 5

As I said before I only have the ESR meter. Would you suggest an Ohm meter and I'll order it immediately! Or would you recommend a multi meter... Whatever you think.

Thank you!

[budm]

Re: Main board Magnavox 32ME402V/F7

Digital Multimeter. I am surprised you have ESR meter but not Digital Multimeter. You do have proper soldering tools to do surface mount component replacement, right?

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

lol I actually just ordered a soldering station today. I'll have it in 2 days.

What do you think of this one?

https://www.amazon.com/Crenova-Auto-...s%2C162&sr=8-4

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Well I hope that will do the trick because I ordered it, lol.

AND I can tell you for a fact that it's the main board because I found one on Ebay. and installed it today and voila! The TV is working!

I still want to learn how to fix the old one though, now that I've bought all the tools. I'll have the meter and soldering station tomorrow or Monday at the latest.

[budm]

Re: Main board Magnavox 32ME402V/F7

At this point try to locate c3214 and mark it so you can check its resistance when you get the meter, also check the resistance as in post #8.

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Absolutely!

Thank you again Budm, I'll do just that as soon as I get the meter and will report back.

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Okay so,
I believe I have all the tools I need to "maybe" figure this out.

Is it possible to find out what's wrong without actually putting it back in the TV? Like I said I have a replacement board that is working just beautifully and I would hate to have to take it apart if I don't have to, but if that's the only way, so be it. I just want to learn how to find the issue and repair it.

I've included some more pictures if that's helpful.

You mentioned a couple times C3214. I found that number but it doesn't look like anything's attached there. Of course I could be wrong.

I think you may have gotten that from that YouTube video. That wasn't the exact same board. Very close but not quite. It was just the exact same issue.

I pulled one ceramic smd just because I can now with my hot air thingy and measured it with my ESR meter out of circuit and it reads
between 0.650 and 0.750. Of course I have no clue what that means. But I figured I would start somewhere.... LOL Is that a good cap do you think? I circled where I got if from.

Well there you have that. Thanks again!!

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Hello?
Anyone there?

lol

[budm]

Re: Main board Magnavox 32ME402V/F7

Read post #8 about checking the resistance.
Read post #13, you are supposed to check the RESISTANCE of the suspected bad cap with the Ohm meter (Multi meter), that is what the meter you bought it for. I do not understand why you use ESR meter, we are looking for DCR of the cap, not ESR.
https://www.badcaps.net/forum/attach...3&d=1562566440
Is that C3214? I cannot read the deisgnator form your pictures.
Please follow the instruction if you want help troubleshooting the problem.

[beuknowsdiddly]

Re: Main board Magnavox 32ME402V/F7

Sorry Bud,
I told you in the beginning I was an absolute novice. So am just unsure on how/what I'm checking. You said,

ALL 3.3V
P-ON +21V
Amp +13V

Not sure what all that means or how to check it. "P-ON" does that mean power on? and how do I know what's 21V? and what's Amp +13V? and how do I measure them?

You're obviously thinking I know more than I do. Again I'm an absolute beginner. "Don't get snippy with me mister!" lol

You said, you can't check ESR inline so I removed the chip and was just asking if that reading was okay so I could get an idea of what the ESR should be. I understand you're looking for DCR and I'll try to figure that out, but again don't know how to do that at this point.

The link you copied is not the C3214 you keep referring to. You can clearly see that number in the first 2 pictures.

I redid the pictures. The Arrows show you where that C3214 is located. Hopefully that will help. In the meantime I'll try to figure out how to do what you requested in post #8. Thanks again.

[budm]

Re: Main board Magnavox 32ME402V/F7

Let's see your meter first.

[budm]

Re: Main board Magnavox 32ME402V/F7

BTW: https://www.badcaps.net/forum/attach...4&d=1562566440
Which cap is that one that you removed? C?????
You must be real careful handling that type of cap (MLCC), it can be easily be damaged during removing or reinstalling. You must check its DC resistance before you put it back in place and after it is put back in place.