Vizio VP503 HDTV10a Black Screen

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Sorry, tom66, but I might be a little thick. When you're talking "Click", you can't be talking about SD1-4. Those tabs don't click. I assume you're talking about SC/SD42 and SC/SD46 (see pic). I believe these are seated correctly with the click. If I'm confused, please clarify.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

I'm tallking of the orange connectors going to the plasma panel itself. I can clearly see in the above photo they are not correctly connected.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

That is a classic sign of improperly seated connections. Getting them lined up is really really tricky. But essentially you can push them in and when you get it right you will hear a "click" sound and it will go all the way in.

"Really Tricky"? That's the understatement of the year!! I've got it down to a few, smaller bars. I will continue to work on it. When seating these connectors I never once heard a "click". Look at the pics, there is an alignment (?) notch I'm using.

Yesterday I installed the SU buffer with the bad IC, removed the jumper and had black screen, no glow. So, I'm ordering an SU board.

In the meantime, a VERY important question: Can a faulty SU board, only, bring down this set? It still shuts down automatically after 40 seconds (used to be 30) with SU out and jumpered. And the LED's on the SC and SS now stay on for 60 seconds before fading out. Where else should I be looking or should I wait on the SU board?

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

It's hard to describe locking those tabs in but not quite a click.From memory you can push them in and think they're right but sometimes you feel a little resistance and then a little more pressure and it goes a little further and you know it's home.
The markers are handy to compare to give a guide that it's home and parallel.

Once home, obviously that locking latch has a nice positive clicking action. If they're not quite right sometimes that latch will not click home and sit up a whisker. Maybe that is what Tom is referring to?

It's a touchy feely job , all about keeping it nice and square and good even pressure. The last thing you want is to be rough and kink those ribbons.

I don't know, I really was hoping to see it start up with a good bottom half. Not being a true panasonic, I can't guess what protection ccts may be in place.

I was wondering what would happen with the jumper and no buffers hooked up to the SC board. If the set shuts off at 40sec, whatever you see on those sustain boards would be residual charge bleeding off.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

tw, I'm not sure what you mean in you're last sentence. Where would I hook the jumper if the buffers were removed? In the same screw pod? I'M willing to try it. Are you thinking the set my stay powered up? Should I be worried about the caveat of running the system more than 30 secs without the boards?

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

It appears this set chains the signal from the upper buffer to the lower buffer. No upper buffer, no picture (just primed.)

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

I can't make out the connectors on the buffers but I'd disconnect sd46,sd42,su41 if they just pop out. that would leave nothing going into the buffers and still use the screw posts to jumper to L801. I've only ever tried that on the next series when they introduced the 2 pin sc50 which is jumpered to do the same as what we are doing on this. The idea is to help determine when you get 7 blinks whether it's buffers or SC board.
I have tried it with a good SC to see what happens and basically it'll fire up normal (no picture)with no fault code. If it went 6 blink then it also means a bad SC, but this is not a full panasonic but may fire up and stay on.

I'd have it on only long enough to see if it went past the time it currently stays on. 30secs does seem a long time for it to decide something is wrong to me so maybe ther's more than one fault here. I have nothing really to base any real judgement on this.

Tom definitely would have more overall experience with these. 12th and 13th gen panasonice I've done a little more with.

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

It appears this set chains the signal from the upper buffer to the lower buffer. No upper buffer, no picture (just primed.)

So what are your thoughts about it still shutting down after 30sec? I thought the concept was it would prime and stay on with the bypass.

Do you think applying too much Panasonic testing methods to this is wrong since it's a Vizio.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

The D board usually handles shutdown on a Panny... perhaps it is normally shutting down due to "no signal"?

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

I was wondering about the D board but never troubleshot one. No D boards in my 12th an 13th gen models.

I guess it's still possible the SC could have an issue as well?

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

I think that because the panel is being primed and the ERC LED is lighting up the SC is good. That LED lights up when the ERC caps are between ~65V and ~125V. The ERC basically steals energy from the panel (that would otherwise be wasted as heat) using the resonant inductor and capacitor tank. So both the ERC and sustain portions of the board are working OK. You can think of the ERC as averaging the SC's output (excluding the reset/priming pulses) and storing it across those poly film caps.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I'm watching and learning. I thank you guys!

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

I was just thinking when I had that sc with a low and unstable VAD it would power on for short periods then shutdown , led lit although it would not start every time like this does.

I guess until that Su gets replaced, I'm only guessing.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

VAD is used to load data onto the panel. I guess low/missing VAD would cause a primed screen but no visible image, or perhaps all pixels would be set. I don't know for sure.

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

No idea, probably depends on how low but when I bypassed that part of the shutdown cct it was watchable just below the upper threshold, a little flickery. It's probably not part of the shutdown in this but definitely is in my 12th gen. Sorry heading off in tangents.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

SD46 and SD42 disconnected. No SU installed. Jumper in place. Power on to shut down still at 40 seconds. However, I could hear a slight hum from the lower part of the SC board. I'm waiting for an answer about an SU board.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Does the LED stay lit on the SC?

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Does the LED stay lit on the SC?

Yes. On both the SC and SS. They only fade out after the shut down. Before, when I had the 30 second shut down, they faded out after 20 seconds.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

I think the SC, and SU, is working then.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I think the SC, and SU, is working then.

Did You mean SS?

Question: Within the past year we had several storms and lost power. The 1st time for 5 days and the 2nd for 15 hours. I powered my house with a standard gas generator for the heating boiler, lights, fridge and the TV I am currently working on. With the TV I did this for about 3 hours each evening. When not being used (the TV) it was unplugged from the system. The generator was running when the TV was plugged in to avoid a surge when starting it. I used heavy duty extension cords.

Could this have effected the electronics? And if so, which ones since the PS is working fine. Just hunting for knowledge...


SU board should be here Friday.