RCA 42PA30RQ abnormality

[Maushinator]

More or less I'm stuck. I am getting power but no video except for a brief static session when I first power up the unit. The screen has a slight glow to it, I have no shorts in the diodes or transistors on the X or Y main and nothing pops up on the PDP test. Does anyone have any suggestions on what to do from here?
Any help would be greatly appreciated.

[Maushinator]

Re: RCA 42PA30RQ abnormality

VA voltage at power on @120 (supposed to be 55) with voltage drop to 0. VS @ normal also with voltage to 0. That is with and without the Y main connected.

EDIT: I Also PS&VS on checked to be good.

[Maushinator]

Re: RCA 42PA30RQ abnormality

I just tried to do a PDP test again (jumped 3 and 4 and disconnected LVDS from the main) but I also jumped the VS on to the ground still no result on the PDP. The relay clicked as it should have but still nothing displayed on screen. I then tested the VA @0v the VS was @ 6v the VE on Y main @ 6.1v and the VE on X main was @ 0.

I don't know if any of this information is helpful to anyone but I'll keep posting my findings..

[Maushinator]

Re: RCA 42PA30RQ abnormality

Update: So I realized I didn't disconnect the ribbons upon testing the VA/VS.. So the VA rated at 55v is actually reading and holding 120v. The VS rated at 207v is reading and holding 464v. Does that mean my PS is bad because it's not regulating the power output?

[Maushinator]

Re: RCA 42PA30RQ abnormality

Or my control board is bad because that's what regulates my PS output?

[Maushinator]

Re: RCA 42PA30RQ abnormality

The light flashing at 5 second intervals flashes at the normal 1 second interval with the Y main ribbon disconnected. With the Y main disconnected and the power connected the X main hums and the VE is reading 220v.

[Maushinator]

Re: RCA 42PA30RQ abnormality

With that said signs point to either the Y main and/or buffer as the problem?
But what about the high voltage issue?
100% lost once again...

[newtothis]

Re: RCA 42PA30RQ abnormality

As I said my knowledge of Plasma displays are limited... but a tip to obtain help... Don't keep posting on your own thread like that or people will think you are being helped out by someone

[Maushinator]

Re: RCA 42PA30RQ abnormality

As I said my knowledge of Plasma displays are limited... but a tip to obtain help... Don't keep posting on your own thread like that or people will think you are being helped out by someone

Noted. It's my first thread I figured I would try to be as informative as possible whilst I sit here like

[newtothis]

Re: RCA 42PA30RQ abnormality

Just need to wait until one of the Plasma Techs comes along, Be patient.. help will arrive

[Maushinator]

Re: RCA 42PA30RQ abnormality

I have 2 low readings on my Y buffer board in comparison to the rest of the connectors in the line. I'm just going to order a new Y buffer to see if that fixes the problem. I had everything connected except for the Y buffer and the LED on the control board flashed normally. As far as my power problem goes.. Who knows. Does my assumption sound correct?

[newtothis]

Re: RCA 42PA30RQ abnormality

Tom, What do you think.. you have more knowledge than me on these

[Maushinator]

Re: RCA 42PA30RQ abnormality

I just had another idea. Maybe reconnect the Y buffer but leave the panel disconnected and to see if the LED on the control board flashes in safe mode again...

[capkid]

Re: RCA 42PA30RQ abnormality

Your voltage readings don't seem to be measured correctly. VS of 464V sounds ridiculously high, and I'd expect to see some serious damage as a result.

[Maushinator]

Re: RCA 42PA30RQ abnormality

You would think but it doesn't make sense for them to be that high... I mean nothing gets hot as you would think it would if the voltages are indeed that high. I would think the damages would be immense. This might be a stupid question but the voltages should be tested in AC right?
I reconnected the Y buffer board without the panel connected and the LED on the control board flashed back in safe mode so I officially ordered the Y buffer board.

[capkid]

Re: RCA 42PA30RQ abnormality

No, the voltages output by the PSU are DC. Either way, a buffer board might be a good place to start if you in fact don't have any shorts on the Y-main or X-main.

[Maushinator]

Re: RCA 42PA30RQ abnormality

Figures, I'll recheck the voltages tomorrow and post back the results. No shorts in the boards for sure. I even checked the tiny diodes on the bottom side of the boards. I read somewhere that the LED on the control board only flashes in 5 second intervals if it indicates a problem with the Y main, the X main and/or the Y buffer. So, on or before 12/26 I'll find out if replacing the Y buffer fixes the problem.

[tom66]

Re: RCA 42PA30RQ abnormality

Glowing screen: try this:-
https://www.badcaps.net/forum/showpo...61&postcount=2

Also, check VA fuse on E/F buffer boards.

[Maushinator]

Re: RCA 42PA30RQ abnormality

Tom, I tried the PDP that way and I also tried that but also disconnecting a plug coming off the PS to the control board (on the control board side and placing a jumper wire from VS on to the circuit ground and nothing at all showed on the panel either way.


Edit: I haven't removed the E/F buffer boards. They seemed difficult to get to but I'll look more into it in a few hours.

[Maushinator]

Re: RCA 42PA30RQ abnormality

There is no fuse on either the E or F buffer boards. The voltages for VA and VS are normal upon testing them in DCv