This guy has an RCA 42PA30RQ

[Bling23]

Re: This guy has an RCA 42PA30RQ

I've replaced every stinking board on this TV and still no picture sound ......so is it safe to say its a bad panel???

[tom66]

Re: This guy has an RCA 42PA30RQ

There is the possibility; a leak in the gas may not necessary cause the buzz of death.

[Bling23]

Re: This guy has an RCA 42PA30RQ

Welcome back Tom. Here's a YouTube link of what's going on. This is pre purchase of the PSU http://youtu.be/fAayKZH_AHY

[vinceroger69]

Re: This guy has an RCA 42PA30RQ

could one of your new boards also be faulty?

[tom66]

Re: This guy has an RCA 42PA30RQ

Check VSON on control board. Note some newer Samsung will not power on with missing X-main, they changed the design unfortunately.

[Bling23]

Re: This guy has an RCA 42PA30RQ

Do you mean Vscan from Y-main ???

[tom66]

Re: This guy has an RCA 42PA30RQ

No, VSON on control board to power board. LOW (<0.8V) is Vs/Va on, HIGH (>2V) is Vs/Va off.

[Bling23]

Re: This guy has an RCA 42PA30RQ

Vince I tested all the boards before installing them. Problem is when I have all the boards installed, I get buzzing sound from x-main. Then I end up shorting out the mosfets on both the y and main. And I can't find those fets here or anything comparable. So I have to wait forever to get them shipped from main land China....if I replace the whole Y main,that will be my forth board And third for X-Main. Right now Im on holding pattern until the mosfets come in

[Bling23]

Re: This guy has an RCA 42PA30RQ

On yes, I checked that..PS-on is 4.5v high on 0v low off.. VS-on 0v low off and 3.2 high on

[tom66]

Re: This guy has an RCA 42PA30RQ

Sounds odd. When Vs/Va are active, what does VSON measure?

[Bling23]

Re: This guy has an RCA 42PA30RQ

0.1 volts

[tom66]

Re: This guy has an RCA 42PA30RQ

And then when the Vs/Va turns off, it goes high?

[Bling23]

Re: This guy has an RCA 42PA30RQ

Edit..3.257 volts for Vson

[tom66]

Re: This guy has an RCA 42PA30RQ

?????

[Bling23]

Re: This guy has an RCA 42PA30RQ

When I turn off Vson is at 0.1 volts PSon is at 4.5 volts

[Bling23]

Re: This guy has an RCA 42PA30RQ

With the tv off PSon is at 4.5 volts...the VSON is at 0-0.1 v.. With the tv powered on, PSON is at 0.1 volts and VSON is at 3.25 volts

[Bling23]

Re: This guy has an RCA 42PA30RQ

Tom does that appear to be right??

[tom66]

Re: This guy has an RCA 42PA30RQ

K, so when the TV shuts off (Vs/Va low), what happens to VSON, does it change?

[Bling23]

Re: This guy has an RCA 42PA30RQ

If your talking about the output volts from the PSU to the logic board, PSon is 4.5v with TV off..and VSON is 0.1. When I turn tv on, PSon is 0v and VSON is 3.3v

[Bling23]

Re: This guy has an RCA 42PA30RQ

Vs and va on the high is normal with power on 207vs va 54v