This guy has an RCA 42PA30RQ

**Bling23** · 03-10-2013, 10:58 AM

Re: This guy has an RCA 42PA30RQ

If the Ve voltage is low or missing disconnect the power supply cable from the X board. If the Ve voltage rises the X board is probably shorted. If the voltage stays low the SMPS board needs to be replaced. If the Vs voltage is low or missing it can be caused by a defective X or Y board. Check both boards for short circuits before replacing the SMPS board. If the Vs voltage is too high an effect called diffusion may occur. Diffusion is when the initialize voltage is too high. Excessive voltage causes unwanted pixel firing creating intermittent sub-pixel flashes. Power on-off cycling can be caused by a shorted component on the Logic board loading down the standby 5V.

**Bling23** · 03-10-2013, 11:15 AM

Re: This guy has an RCA 42PA30RQ

That text is from the manual I downloaded. However my TV doesn't state what the VE voltage should be. It only has Va and Vs and Vsc

**Bling23** · 03-10-2013, 11:23 AM

Re: This guy has an RCA 42PA30RQ

Tom do you know to use ESR meter to locate a short to ground on the curcuit trace?

**tom66** · 03-10-2013, 11:52 AM

Re: This guy has an RCA 42PA30RQ

Ve is around 70~130V.

**Bling23** · 03-10-2013, 12:00 PM

Re: This guy has an RCA 42PA30RQ

Ok mine is at 64

**tom66** · 03-10-2013, 12:05 PM

Re: This guy has an RCA 42PA30RQ

Hmm, 64V may be OK, seems a little low, but you should still get a picture.

**Bling23** · 03-10-2013, 12:37 PM

Re: This guy has an RCA 42PA30RQ

That's with the X-Main disconnected

**Bling23** · 03-10-2013, 12:41 PM

Re: This guy has an RCA 42PA30RQ

I Ve is missing with X-main connected

**Bling23** · 03-10-2013, 12:44 PM

Re: This guy has an RCA 42PA30RQ

Disconnected X-main for re test and Ve volts are 62.5v

**Bling23** · 03-10-2013, 12:53 PM

Re: This guy has an RCA 42PA30RQ

Re checked Ve at the Y-main again and it's down to 59v...dismay that's pretty low voltage

**Bling23** · 03-10-2013, 12:54 PM

Re: This guy has an RCA 42PA30RQ

I'd say not dismay

**tom66** · 03-10-2013, 12:59 PM

Re: This guy has an RCA 42PA30RQ

There is possibly a Ve short then.

**Bling23** · 03-10-2013, 01:56 PM

Re: This guy has an RCA 42PA30RQ

Hmm where would you think that Ve short is coming from, PSU or other board?

**tom66** · 03-10-2013, 01:57 PM

Re: This guy has an RCA 42PA30RQ

X-main.

**Bling23** · 03-10-2013, 02:04 PM

Re: This guy has an RCA 42PA30RQ

Duh!!! I lost my train of thought for a second...ok I'm going to take a break from this Tv until my replacement X-main arrives. I hope that takes care of the problem. It should be here on the 15th. In the mean time ill be doing more learning and research on how to fix electronics such as LCD and plasma TV's

**Bling23** · 03-10-2013, 02:06 PM

Re: This guy has an RCA 42PA30RQ

I LOVE WORKING ON THIS STUFF!!!!!! Troubleshooting is fun

**Bling23** · 03-10-2013, 02:17 PM

Re: This guy has an RCA 42PA30RQ

I just discovered something interesting.. When I connected the ribbon cable that goes from the logic board to the Y-main, My Va and Vs and Ve drop just after power up. When I disconnect the ribbon cable and power up the TV, My Vs Va are stable

**tom66** · 03-10-2013, 02:18 PM

Re: This guy has an RCA 42PA30RQ

This seems to indicate something on the Y-main is forcing the control board to shut the TV off.

**Bling23** · 03-10-2013, 02:31 PM

Re: This guy has an RCA 42PA30RQ

Could be the control board is bad. I do recall the tv had no problem powering up prior to me removing the original Y -Main. Ever since I reinstalled the Y-Main I ran into this mess with the Tv not turning on

**Bling23** · 03-10-2013, 02:42 PM

Re: This guy has an RCA 42PA30RQ

I meant could it be the control board is bad

This guy has an RCA 42PA30RQ

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