This guy has an RCA 42PA30RQ

[Bling23]

Re: This guy has an RCA 42PA30RQ

same test and it didn't even budge..flat line with humming sound

[tom66]

Re: This guy has an RCA 42PA30RQ

So both Y-main and X-main would appear defective. Can you repeat testing on Y-main with X-main unplugged?

[Bling23]

Re: This guy has an RCA 42PA30RQ

the replacement y-main i purchased had a diode that the original y-main did not have but the board part number and rev all matched

[Bling23]

Re: This guy has an RCA 42PA30RQ

with X-Main disconnected

[tom66]

Re: This guy has an RCA 42PA30RQ

So... more or less the same. I would try replacing Y-main first. The one you got appears defective.

[Bling23]

Re: This guy has an RCA 42PA30RQ

Great $40 down the drain!!!

[Bling23]

Re: This guy has an RCA 42PA30RQ

There's a light bulb on the PSU near the AC input,,,Do you know what that bulb is meant to be?

[tom66]

Re: This guy has an RCA 42PA30RQ

It is actually a surge arrestor and shouldn't normally light.

One thing I did not immediately consider was the possibility of the control board being bad.

Can I see a picture of the control board on your TV? I think it's under the main board on this mode.

[Bling23]

Re: This guy has an RCA 42PA30RQ

OK..coming right up

[Bling23]

Re: This guy has an RCA 42PA30RQ

k

[tom66]

Re: This guy has an RCA 42PA30RQ

OK, can you check along this connector on each of the points I mark.
Set scope to 100us/div and centre horizontal (press the "HORIZONTAL POS" knob.)

If you see no waveform (more or less straight line), note that.
If you see a waveform, please take a picture or screen capture.

[Bling23]

Re: This guy has an RCA 42PA30RQ

ok I copy

[tom66]

Re: This guy has an RCA 42PA30RQ

Oh and 2V/div with 1X probe is best scale.

[Bling23]

Re: This guy has an RCA 42PA30RQ

NO waveform ....and how did you do the drawing on the photo?

[Bling23]

Re: This guy has an RCA 42PA30RQ

oh cancel let me set the @V/Div and change probe X

[tom66]

Re: This guy has an RCA 42PA30RQ

NO waveform ....and how did you do the drawing on the photo?

I used GIMP image editor, it's free software and works great.

[Bling23]

Re: This guy has an RCA 42PA30RQ

Ok Tom..looks like I only get waveform when I power up and then it goes flat

[tom66]

Re: This guy has an RCA 42PA30RQ

I suspect the control board.
Have you tried this test?

https://www.badcaps.net/forum/showpo...61&postcount=2

[Bling23]

Re: This guy has an RCA 42PA30RQ

no i haven't but i think your right

[Bling23]

Re: This guy has an RCA 42PA30RQ

let me do that test