Vizio VP503 HDTV10a Black Screen

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

tom66. Since these main boards are scarce and around $100., do you think my best bet is to part this thing out?

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Perhaps it is possible to install a Panasonic main board in it? If you got the wiring right, I can't see why it couldn't work.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Thanks for all your help, tom66. Swapping in a Panasonic main board, for me, would present a lot of problems. They seem to be rare too. Some have the D and DC board included on the PCB, and what about the firmware... If I had some real direction and a board cheap enough, it would be an adventure.

This was a good panel. Nice picture, good blacks. In my previous life (pre-divorce), I had a Pioneer Kuro. Awesome, awesome picture. I still get to visit it from time to time.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

It is one thing to take away someone's money and home, but a Kuro? That's plain evil!

I'm sitting here watching a 46" TH-46PZ80B that I got for very little indeed. And it looks awesome. But I doubt it has anything on a Kuro. Still looking out for one to repair but they're damn well built, just like Panasonic, they rarely fail. Most often the only failure is a cracked screen...

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

tom66. I'm thinking about pulling the trigger on a main board, searching high and low. The suffix on my board is 1C. One seller told me this: "The suffix does not do anything with the board, if the part number 3850-0182-0150 matched with your board, then it would works." What say you?

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

tom66. I'm thinking about pulling the trigger on a main board, searching high and low. The suffix on my board is 1C. One seller told me this: "The suffix does not do anything with the board, if the part number 3850-0182-0150 matched with your board, then it would works." What say you?

If the seller says that, they should have a returns policy in case that is wrong, so perhaps ask them about that, that way you would only lose shipping cost.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Tom66, using your video about testing buffer boards I tested the SU upper buffer and found five shorts. I set the meter to beep and set the black on post 2 of SU41 and found the shorts at 1, 2, 15, 28 and 31. See photos.

My questions are:

1. Can this be a reason that the whole screen is black, or maybe in conjunction with another board?

2. Can this be the source of the LEDs on both Y and X boards fading out after 20 seconds and the TV shutting down after 30 seconds?

The lower buffer checked out OK. Anyway, I'm in no hurry to fix this unit. Thanks for your time.

Regards,
Gary

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Is the screen primed? i.e. is it glowing? (Due to it being a Panasonic plasma, the black glow will be very low.)

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Sorry, the pics didn't load. They are there now. Don't know about the glow. It's totally apart right now and when together, shuts down after 30 seconds. By tomorrow I'll have it together and check for the glow.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

You should be testing from the "HV DANGER" point on this picture:
https://www.badcaps.net/forum/attach...9&d=1361203934

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Same shorts testing with HV Danger.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

It may be defective then. I believe on this set you can run it with just SD or SU and get half a picture.

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

11th gen training manual has this for isolation if it helps at all which includes the 50PX80 models. It needs a jumper to bypass the shutdowdown detection for any SU/SD board disconnection.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Thanks, tw2005. I just got back. I'll give this a try when I get the TV back together.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

11th gen training manual has this for isolation if it helps at all which includes the 50PX80 models. It needs a jumper to bypass the shutdowdown detection for any SU/SD board disconnection.

My board is slightly different as you can see in the photo. Is this the L801 which you mention? I'm waiting for the mail and then I will finish putting this together to do that test.

tom66; It's only 10am here. I will do the 'Glow Test' when it gets dark.

[tw2005]

Re: Vizio VP503 HDTV10a Black Screen

My board is slightly different as you can see in the photo. Is this the L801 which you mention? I'm waiting for the mail and then I will finish putting this together to do that test.

tom66; It's only 10am here. I will do the 'Glow Test' when it gets dark.

yep, although I have assumed this has carried over from the Panasonic, I posted it up just in case you try running a single buffer board without the jumper and see no change. Then try it.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Tw, I did it with the jumper in place and got the glow(?), I think. Half the panel(lower) seems to glow with the lower buffer installed. My upper buffer has a short on the upper chip. But there are some horizonal bars. Took some photos. Will upload tomorrow. Only have my iPad running right now.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

If you removed the lower board, reseating it properly is very difficult, which will often cause horizontal bars in the image.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I reseated and the situation is unchanged (you do mean the tabs, correct?). I'll try it again. I'll also try cleaning the tabs. I'm working with this panel flat down and it's difficult to raise it up to take photos. Heavy! See the photos. I've labeled them. L=lower. RAW=unretouched. The screen shots were taken in total darkness with an iPad. Also some shots of the tabs.

Facts:
1. It still shuts down after 30 seconds or so.
2. The LED's on the SC and SS board now stay lit until auto shutdown. Good sign?

Is this now pointing more to the Main board? What tests should I try next? And I must get the tabs straightened out.

[tom66]

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.