Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

By the way, just to illustrate that all of the backlights are all coming on, I was able to take this image of the back panel the last time the tv randomly lit up about an hour ago:

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks for that image and the clarification, SLK. Yes, I think I’ll have to remove the whole bezel to get at them.

As far as the continuity test on the ribbons going from Digital Main to T-con, I just tried it but not sure if I did it right.

First, disconnected the two ribbons from the top of the T-con board (with the power off, of course), then applied power.

Then, set the DMM in continuity mode.

Grounded the black wire against the chassis and dragged the red probe across all of the exposed pins at the end of the now disconnected metal connectors. Did both the thin ribbon, which controls the right-hand side of the picture, as well as the thicker cable (left-side of picture).

On BOTH cables, I got about 9 or 10 cable-end tips (gold colored) to signal with the continuity “beep”. Most pins didn’t. There are about 30-35 pins on each connector. So, maybe 1 out of every 3 or 4, overall, but there was no detectable pattern.

Did I do that correctly?

(Seems like the thicker cable should have tested noticeably different than the thin one, but it really didn’t).

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

The panel boards should be under here:

https://www.badcaps.net/forum/attach...1&d=1541212785

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks, also, SLK001. Can you please take a look at the full photo of the back panel design and board configurations and let me know if this “jives” with your last post and suggestion?

What I’m wondering, specifically, is if I should be inspecting the top of the panel or the bottom more so based on the positioning of the T-con board (bottom center, underneath the black plastic cover in that particular photo), or should I focus on the top of the panel because the LED Inverter Board is located up in the upper center of this set’s configuration?

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Yes, I think these Digital Main Board to T-con cables might be problematic, but not in the same way as the T-con to panel cables because the former have metal connectors where the ribbons are already “implanted” inside the metal ends.

Could they be torn or loose on the inside of the metal. I suppose. Not likely, perhaps, but it would go a long way toward explaining the white/pink/green screen on the left-hand side.

Do you think, then, that a faulty Digital Main to T-con cable can indeed produce these results?

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Q: Is there a possibility that all of this trouble on the right-hand side of the screen could be caused by a faulty ribbon running from the Digital Main Board down to the T-con board.

It is possible, but it is not probable. You could test the continuity of the cable, if you are careful.

Be sure to inspect the top of the panel for bad caps, or even assembly damage. There should be a PCB strip or two where the cables from the TCON connect to the panel.

[budwich]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

have you looked closely at the main to tcon cables... remember what you found with the tcon to panel cables. Odds are likely the same "person" / "fingers" were in the other cables also.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Q: Is there a possibility that all of this trouble on the right-hand side of the screen could be caused by a faulty ribbon running from the Digital Main Board down to the T-con board.

There are to ribbon cables there, one thicker than the other, and maybe the one that is thicker and controls the left-hand side of the screen is basically okay and the thinner one is defective. Can that type of scenario generate the white / pink / green screen that is the one stable element of consternation here?


I suppose other possibilities might be that the origin of the problem is in the Digital Main Board itself or maybe even some kind of fault or misconnection between the T-Con and the panel (meaning, if it isn't being caused by any of the 4 white ribbons coming off the bottom of the T-con board, maybe it goes wrong just after that as the signal tries to get from the last connector in this series directly into the panel itself)?

I have changed these 4 ribbons around enough to think that they are not the problem itself. No matter the sequence I tried (both 10 days ago and in just this last day), the picture always remains the same .... when it deigns to come on at all.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Just decided to try it without the HDMI in (DirecTV has always been the source here), and expected to maybe see the multiple, white, vertical lines as seen in Photo #2 from my last post, but instead I got the following images (see below). As you can see, it says No Signal, and the image tries to "bleed" into the white/pink/green area (if you look closely, you can see the word Signal creep into this blurred out area), but it only goes a few inches onto that side. Maybe if there was a "longer" horizontal image, it would continue to do the same into the white/pink/green abyss.

Anyway, the point is that the set it basically generating, or trying to generate, the same image result whether the HDMI cord is in or not.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Hello all ~

Well, I got the new T-Con board in from China and installed it. Had momentary high hopes because the Vizio logo came immediately on, but then it displayed very much like before with the picture coming in on the left side and the right side still showing the white / pink / green combination.

After that, and for the last 24 hours or so, it has resumed its highly erratic pattern where the screen won't show at all (i.e., just black, because the backlights do not get activated), yet the sound still works. That happens about 90%- 95% of the time. On occasion, and very unpredictably so, the screen will light up just when I least expect it to do so. Sometimes this happens upon power being applied, and sometimes it has happened during one of the long on / off cycles as I let the tv just run for a couple of hours to try to detect any signs of life or patterns.

In short, then, it's pretty much behaving like it did when I had the original T-con board still in. Erratic, unpredictable, and frustratingly unpatterned. And, the right-hand side has yet to show any actual picture.

Below, I am posting 3 pictures:

1. The first one is from about two weeks ago, when I got a relatively good picture on the left and the white/pink/green on the right. Notice the black, vertical line near the middle.

2. The second photo is from just a day or two after that, when I did not have the HDMI plugged in, but was encouraged by the white, vertical lines that appeared on the right-hand side.

3. Now, the third picture is from today, when I was lucky enough to have the backlights suddenly spring to life after about a half hour of nothing on the screen. Notice the slightly green vertical area that matches up with the black, vertical bar in Photo #1 below. This isn't the major concern, of course, because that's the entire right-hand side being still inactive and not producing a picture. But, I thought this black, vertical patch vs. the green vertical patch might provide someone with a clue as to what's going on.


Note: One interesting pattern that appears to be the case is that whenever it does suddenly generate the backlight, it will shut down after two minutes and go back to sound only (this has always been the case), ..... but then I have never seen it generate the backlights again while the power is still being supplied. In other words, if I leave the power cord in, the screen will "come to life" once, .... but only once. I just left it in this state for over an hour after I saw the backlights, but for this last hour it only displays the black screen and continually cycles on and off with the sound being the only thing that is operational. The same has always been true for the last three weeks or so that I have had the set in my possession. It is almost as though the tv needs a reset of the power supply to even have a chance at regenerating the picture. Does this provide any type of clue?

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I would say that your panel doesn't look like it is bad. Shorted line drivers or capacitors usually present as a black display.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

When I get the “solarized” picture, it stretches all the way from the left side of the screen to the right side. My assumption is that that would not be possible if the panel is damaged (on the right-hand side half).

Does that sound right and is that a logical conclusion to make?

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Yes, there is that risk. But it’s one I’m willing to take at this point as there’s seemingly no other way to verify if it’s the T-con or the panel.

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

If the panel is bad, putting in a new TCON could damage the new TCON.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Hello Goznu ~

I do like that idea, yes. Right now, I have that T-con board coming over from China and I plan on installing it as soon as it arrives. I'm hesitant to make any other changes or alterations until I get a chance to see if that T-Con will work and do the trick by itself.

But, if that doesn't work, I'd be happy to take you up on your offer and make that exchange with you. Which boards do you have available for that? Would it be all 4? The PSU, the T-Con, the Main Board and the LED Inverter Board?

I do have one other question maybe you could help me with now. When I took the back panel off, and began to deal with the T-con area, I can't quite recall if the silver, metal plate that protects the T-con had six screws in it or not. I think it did, and it almost seems like it must have in order to be properly affixed tovthe frame of the set, but I can't seem to find them right now.

I'm assuming you have a P652ui-B2 set where perhaps you could take a look or maybe you can recall how yours looked when you took it apart.

Thanks, in advance, for your reply and for anyone's advice on how this metal plate needs to be affixed in order for it to be correct and safe.

Note: The 1st picture below shows the six places where there are arrows stamped into the metal. The 2nd one shows a close up of one of those arrows.

[Goznu]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I have an idea. It may help you or me or both. But, if you get me your address, I can send my boards to you so you can further diagnose, maybe, and possibly get yours working. In turn, if you get it working, verify that mine may be good or bad. We would be just out the shipping back and forth. Sound like an idea?

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

It's possible that only part of one side is bad. What it will display depends on what is wrong with it. Most of your pics show a bad TCON in one way or the other.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Yes, I used PayPal for that very reason.

Q: I am under the impression that usually a bad side of the T-con would normally generate a white screen (i.e., a pure white screen) on that side, or if a person unhooked the cable leading from the main board into that bad half of the T-con that the good half of the T-con would likely still generate a half-picture and that the other half would show white.

Is that normally true with a T-con designed like the one I have here?

Asking because I didn’t get that result in either scenario. My results were just the black screen with sound. In other words, was it somewhat expected that the picture would be completely denied if any of the 6 (2 top cables and 4 bottom ribbons) are not in place and functioning, or if all 6 are in but the T-con is “half-dead”?

[SLK001]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I've had pretty good luck ordering from China. If you use a credit card, or even PayPal, it there is no delivery, you can always get a charge-back.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Just did about an hour ago. Figured it might be weeks or months waiting for one here, so went with BuyQual and an e-packet, trackable delivery. Did this once before and it took about 10 or 12 days to arrive, as I recall. Not ideal, but better than nothing. Just one of those particular parts that seems very rare and largely unavailable.