Vizio XVT3D424SV Spent Too Much Need Help

[infringer]

Hello first off and thanks in advance,

I have a vizio XVT3D424SV LED TV.

Problem is the vizio light blinks on and off and backlights never turn on when I get it to turn white it turns white then starts blinking after a couple of minutes.

Steps I took to remedy the issue:
Purchased a power board off of ebay I hooked the power board up light blinked then I unplugged it and waited 30 seconds then it came to life from this point the unit freezed.

So I unplugged it yet again and plugged it back it there was a slight smell of hot electronics but no magic smoke or indications of burnt out anything after inspection so I figured if it is freezing chances are the processor on the video main board is likely no good or the firmware is jacked so I snatched a new video board and threw that in still nothing.

Is it possible that something in the video board may have took out the power supply with the first video board and I just need a new power board or does the TCON board have anything to do with the BLON signaling?

This is the only board I have not replaced to me it would seem like it is the power board once again that is shot from something or another any insight into this problem would be great I am already married to this pig of a money pit but I do not wish to make it any more expensive then it has to be at this point I could have purchased a new one and had change left over if you know what I mean.

[randtek]

Re: Vizio XVT3D424SV Spent Too Much Need Help

It is possible that the old video board fried something in the new power board, but not extremely likely. Most modern power boards are designed to survive overload conditions-usually by shutting down the switching regulator before damage can occur.

This is a LED Backlight set, so it is pretty new vintage. Chances are there is 2-way communication between T-Con and main boards, so yes, a T-Con could probably cause it to freeze during bootup.

Are there any voltage markings on the power board that can assist you with confirming power supply voltages?

[cashkennedy]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Have you tested the DC voltages from the powersupply? The new power supply could have been bad all along for the same reasons as the first, just to a lesser degree. Unstable voltages would lead to freezing..

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Thanks guys first off!

The TV had turned on the one time so I know the panel itself is in good condition I guess that's a plus but as I said I way over spent what exactly I intended purchasing boards for this unit... Anyhow now I need to figure out the issue.. No fuses are blown on the power board I re soldered some of the joints that looked like they may have been lacking. I do not mind replacing board level items either it would be nice to be able to trouble shoot it this far but I really do not have a schematic or know the voltages I would assume it would be 3.3 or 5.25 or 12v or 24v all being used here... I'll have to drag it back up out of the basement again and slap it on the bed to test for sure... Unfortunately I developed a stomach flu today and feel like a jellyfish and needing to make it to work I must save every last ounce of energy for that its amazing how you can go from feeling alive to a mess all in a matter of hours.

Anyhow my brain is still functional so ... I will continue to ponder and ask some questions.

I am not getting a picture at all now so in thinking about this I do not even get a backlight when the vizio led goes solid white or is in the ON state...

So again TCON and freezing sure its possible but no backlight on? This has me somewhat stumped well obviously the power board is not getting the BLON power signal...

Does the TCON have anything to do with turning the backlights on?

Normally I assumed this was always the main board which sends the signal to kick on the higher voltages to enable the backlights on boot or it could be the powerboard not sending the 5v's did this change in newer TV's or does it still pretty much follow the same basic principals?

EDIT BELOW:
Power seemed low on the first power board as I was getting 4.x volts don't remember the exact # but I would assume this should have been 5v I ran diode tests on many of the diodes around the transformers and also checked all caps with an ESR meter and everything seemed to be good that I checked but during checking the first power board I blew the fuse dropping the lead on a what appeared to be a voltage regulator it arced off and blew the fuse first time that one happened for me but never the less a bobo so I thought about getting another 5amp fuse but with the low voltages and no strong leads as the cause of it I figured hell I'll try a new power board.

Would be nice if someone else had this set and could share some info with me so far it seems that whatever it is is likely a common problem as I have seen many folks into no backlight, picture and a blinking light for some unplugging it for 30 seconds works no such luck here though. Be nice to pin this down to a component level so I could either use a higher quality replacement part to ensure this won't happen again or some type of protection circuit.

[selldoor]

Re: Vizio XVT3D424SV Spent Too Much Need Help

I doubt if many of us have this set - what you could do is post lots of good photos of your boards so we can SEE what your talking about.
pictures of each board, front and back and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed
https://www.badcaps.net/forum/attach...1&d=1290283049

https://www.badcaps.net/forum/attach...7&d=1280167246

[JimmysTGP]

Re: Vizio XVT3D424SV Spent Too Much Need Help

If all your voltages appear to be there, and it being a backlit TV your backlight won't be there until theres an Image, Then your T-CON is more likely to your problem. you've already replace the PS an Main boards. T-CON can be working for a moment then go bad, but what they can't do is return back working once the problem exist.

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Yes when I can locate a sub 150.00 USD TCON board for this model I may try it until then I guess this unit will be a dust collection unit.

There is little to no time before I move into my new rental home... Kinda need to worry about that but if I can find one by tomorrow I may order it at the right price... Or possibly I will diagnose things further and remove the TCON and try to see if there is anything obvious that says this is wrong.

All cap esr values are good all fuses that I can see on the video board and power board seem to have continuity as well.

voltage testing needs to be done still just keeping everyone else who may be having the same issue up to date ...

SUMMARY OF WHAT HAS BEEN DONE:
I currently own one of these TV's it has the VBLOD

VBLOD = Vizio Blinking Light Of Death

In some cases you can unplug the unit for 30 seconds and it will begin working and functioning as normal.

In my case I was not so lucky...

So I am sure that the screen is good so I figure what the heck lets fix it.

First thing I assumed it has got to be the power board cause after it blinks the light goes solid and there is no backlights that come on so I replaced the power board. After replacing it I powered it up then bingo the screen came up but... It was frozen at the startup screen so I rebooted it and there was nothing back to nothing and a blinking light.

So with this information I thought ok well a video freeze maybe it is the video board that is not signaling correctly so I replaced the video board and there was nothing again.

Quite the delima I have over 300.00 in boards invested in this TV and still it refuses to work ...

I am open for suggestions and would like to be able to do a board level repair as it will cost me a lot less money if at all possible...

The only thing I can think is maybe one of the following happend.

1) It has been the TCON board causing the issue all along
2) The original video board had something wrong with it that took out the new power supply that I put in the unit.
3) The TCON is bad and took out something in the power board so I need a new TCON and a new power board.

I will assume it is option number 1 as if either 2 or 3 is correct it is a major design flaw by the engineering team for not putting protections in place between boards and this would be an epic failure and may cause class action lawsuits for all TV owners of this model of TV.

[budm]

Re: Vizio XVT3D424SV Spent Too Much Need Help

The backlight should be able to come on without T-CON connected to the main board, unless the TV uses the Failed T-CON signal to turn the TV off and gives the error code, most TV backlights will come on without T-CON.
So far we have not seen the pictures of the boards yet.
Does your power supply/inverter board look like this?
http://assets.shopjimmy.com/media/ca...0006070080.jpg

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

The backlight should be able to come on without T-CON connected to the main board, unless the TV uses the Failed T-CON signal to turn the TV off and gives the error code, most TV backlights will come on without T-CON.
So far we have not seen the pictures of the boards yet.
Does your power supply/inverter board look like this?
http://assets.shopjimmy.com/media/ca...0006070080.jpg

Shop Jimmy is down currently... but I will get you a pic of the video board and power board tommorow gotta find my camera got stuff all half packed...

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Here are the pics:

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Errr thats the m420sv power board sorry... Grabbed the wrong photos oddly though the M420sv is actually rather similar but, here is the power board.

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

for reference I would like to include a photo property of shopjimmy because for some reason or another it is not showing up correctly...

But this is all 3 boards finally moved in and have internet albeit a bit slower then what I am used to but it works at least...

But this should be everything if there is any takers on where to start as I said all Caps tested good with the ESR meter. So caps are out of the question I've tested quite a few diodes as well but do not recall exactly where I left off with that...

I still need to take voltages and figure something out but there has to be common failure points of a TCON board.

And yes all fuses checked for continuity as well the processors on both the TCON and the Main Board get warm like they are trying to work ...

Trying to think of anything else I could include to help you help me diagnose this thing I really don't want to dump too much more cash into this thing. I will continue to slowly trouble shoot this I don't learn by swapping full boards I figure anyways so gotta get the head screwed on and use that ole pink matter behind my eyes.

But help here is greatly appreciated I will take a PM if you prefer not to be public with your answers as well I understand some folks have business to conduct and wouldn't want to take that away from you.

Take Care all and thanks!

EDIT: There is no physical indicators that would point to something being burnt up or faulty so nothing visual worth mention that is about the only other thing that I can think of that is worth sharing at this point.

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

T-Con stands for timing control board and the TCON can only in most cases either effect only half of the screen left or right or the full screen... So in my case it could be that the TCON is effecting the whole screen. I believe this to be true but I could have this wrong slightly I believe not entirely sure on this so those of you reading this is nothing more then an assumption and I could be wrong here I am not stating this as fact just relaying an assumption to see weather my thinking is correct or incorrect. Oddly I have seen some cases where lines in the screen were supposedly caused by the TCON posted on the internet but I do not know weather to believe it as fact or possibly these cases were just lose connections that got reseated and this is why the unit really started working. I have seen other techs say that certain colors of lines are indicators that the TCON may be possibly at fault as well but not entirely sure weather this is fact or fiction either...

Anyhow just an update after reading about other people having issues with TCON boards ... I guess I should be researching the blinking vizio light a bit more and see whether the TCON is an issue in some of these random cases I know one thing the blinking VIZIO light is not limited to me and others say that unplugging their TV for a half of a minute fixes the issue in many cases.

Just figured I would keep those interested up to date on my progress I probably will not have the room to work on my TV and check voltages for another week or so when everything is organized at my new place but either way I find this TV a rather interesting challenge so far.

Anyone else with info please do share your thoughts I and everyone else having a similar problem may be interested in what you may have to say or know that could aid in this....

[infringer]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Solution was the TCON thanks for the attempt what it was on the TCON was not able to be determined after hours of testing it seemed like it had to be the TCON so I went for it and it was fixed! Finally got the 3D TV up and running!

Anyhow now I need some help with another project for my sister... but its audio so I will post it in the respective forum. RCA RT2770 look for it if you think you can help it is an SMPS issue I appears to be an inductor but the bands are rubbed off this is a tuff one.

[budm]

Re: Vizio XVT3D424SV Spent Too Much Need Help

That's great news! good job well done.

[MisterD]

Re: Vizio XVT3D424SV Spent Too Much Need Help

That's great news! good job well done.

Someone here locally is selling the same Vizio 42" LED Model XVT3D424SV, he said it has sound and the backlight is lit, but no picture, he is asking $ 200 I'm wanting to buy this tv but hoping it won't take a lot of money to fix, any advise on this is appreciated. He said he bought it new and it has never been opened to attempt servicing it. I have not looked at it yet.

Thanks!

[retiredcaps]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Someone here locally is selling the same Vizio 42" LED Model XVT3D424SV, he said it has sound and the backlight is lit, but no picture, he is asking $ 200 I'm wanting to buy this tv but hoping it won't take a lot of money to fix, any advise on this is appreciated.

$200 is ripoff.

For $400, I can go to my local Costco and get a 40 to 42 inch TV when a 2 year warranty included. For an extra $30, I can get that extended to 5 years.

With your black Friday sales coming up, I think you can do a lot better.

[MisterD]

Re: Vizio XVT3D424SV Spent Too Much Need Help

Yeah, maybe I should wait, but I'm wanting to buy one not working and repair it myself, could find one cheaper but this is normally about $700 or $ 550 with free shipping on ebay. http://www.ebay.com/itm/Vizio-42-XVT...item25766a37a2 Thanks for the advise.

[MisterD]

Re: Vizio XVT3D424SV Spent Too Much Need Help

How about a 47" Vizio for $150?? has this problem...Unit powers on, then displays a green vertical line down the right side of screen. Model E471VLE, I'm wondering if this could be a issue with the actual lcd screen.

[lti]

Re: Vizio XVT3D424SV Spent Too Much Need Help

These 3D LED TVs are already dying?