Vizio VP503 HDTV10a Black Screen

[MyHD120]

When the screen went black there was no audible pop. Breakdown shows no visible bad caps. I've removed the PSU (LSJB1260-1), the main (3850-0182-0150), and replaced the SC (TNPA 4393AE) and still no picture. No visible burn marks on the foil side.

Here's the dilemma; The VP503, from my research, is a Panasonic TH 50PX80UA, for all intent and purpose. I cannot find a service manual for the 503, so I've been studying the Panny manuals. Although there are some differences, page 16 of the service manual (see pdf) is telling me it's an A board problem. In 2009 Panasonic incorporated the D board into the A board. This set has the D board which is older Panasonic technology (pre 2008) On my SS and SC boards those LED indicators are marked D253 and D583. They only stay lit for a few seconds and then fade out.

I have a DMM and a Blue ESR. The DMM has auto ranging. I am a real novice with electronics so be patient and precise when giving instructions. I have pictures but do not want to clutter your board. Ask for specific or all and I will load them.

And, might I say, this is an awesome board. I've went through the 200+ pages and am confused as ever.

Regards, Gary

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

First, can you supply pictures of the chassis?

In a dark room, does the screen appear to slightly glow?

Does the LED blink red a number of times? If so, this is a error code. Count the blinks between each pause.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Repair/Service guides.
http://www.tgohome.com/ServiceManual...&Search=Submit

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I don't think Vizio has a blink code. If it does I never saw one. The on light starts amber and then goes to blue.

Screen does not glow in a dark room.

I have all your manuals plus many others (Panasonic, not Vizio)

As you can see in the photo, I'm just putting the power board back in.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Ah, yes, since this is a Vizio TV with a Panasonic PDP, it won't blink any error code. Such a shame to see sublime engineering (Panasonic plasma display panels/modules) mixed with Vizio's excuse of a main board.

Have you tested the power supplies' Vsus output?

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

No I haven't as I'm not sure how to do it. See photos for connection to power board. Do you test with the connector on? And how. Auto ranging? The Vsus sticker says 186v.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

186V on a Panny plasma module? That's pretty low. Normally around 200-215V.

The voltage can be measured across PMM7 - careful high voltage.

Do the relays click, at all?

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Is this the manual for your set?
http://www.tgohome.com/ServiceManual...&Search=Submit

Looks to use a Panasonic plasma module but an earlier revision.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

It's somewhat correct> I have no idea what the 'F' before the HDTV means. And this model has 2 power supply boards as later model 1080P sets. I did read this one before but didn't get much out of it.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

And my LED goes from orange to BLUE.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

When it goes orange-blue you should hear a relay click, do you?

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I plug it in: series of 4 clicks, LED is orange. Power on button: 2 clicks, LED is white. My fault, not BLUE.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

OK, when it clicks, do you get anything on PMM7, as I listed above? (Care -- high voltage.)

Also, when it goes white, if you press standby button again, does it go orange again?

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

I'm not sure what PMM7 is. I'll go check the standby.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

Top left of this picture
https://www.badcaps.net/forum/attach...7&d=1359910192

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

Pressing standby: goes back to orange.

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

PMM7 on stanby: Starts at about 5v and continually drops. On power on: starts at about 187v and drops. I hope I got that right.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

OK, that's good, but I don't know why it's shutting down. Does it click just as it shuts down?

[MyHD120]

Re: Vizio VP503 HDTV10a Black Screen

When I push the standby/power button there is a single click. It doesn't automatically shut down. Only when I power it down.From my reading I think that the power routes through the D board to send signals back to the power board and video signals to the SC and SS boards. I'm not positive, but I think I've got that right. I bought the SC board from ShopJimmy. I don't think I needed it. I'd like not to buy a D board unless I need one.

[tom66]

Re: Vizio VP503 HDTV10a Black Screen

So, 187V rises, then drops out, with no click? With the SC and SS installed, what happens?