CurtPalme.com Home Theater Forum

danOO00 · Joined: 22 May 2007 Posts: 70 Location: Putnam County, NY

I have a NEC 9PGX that I hope is not coming down with the scrambled mess syndrome!

It has always taken about 3-5 minutes of warmup before the 1080i 72Hz memory input from the PC would stabilize. During warmup the image would look like a very high frequency horizontal amplitude wave scrambled the image. It would disappear slowly from the bottom up, and then the image would be fine.

However, last night it took almost 30 minutes for the image to stabilize, and I am worried that this is a symptom of a bad system board getting worse.

I have memories set for 1080i 60Hz (cabletv) and 1080i 72Hz (HTPC). The 60Hz input has never shown this behavior- even last night when the 72Hz was scrambled- I could switch input back and forth no problem- the 72Hz was bad and 60 Hz was fine. I also switched the PC to 720P 60Hz -a rarely used memory and that was fine too.

When there is a 'no signal' condition the menus are scrambled all to hell- this has always been an issue since I got this PJ, but I never really cared much since inputting a signal would resolve it. I read about the scramble mess syndrome while searching through the boards a few months ago, and checked for any voltage on the ground/neutral- I found none.

What can I do to troubleshoot besides swap out the system board?

Thanks,
Dan

**Curt Palme** · Posted: Thu Oct 25, 2007 4:00 pm Post subject:

You need to swap out the system board and/or the deflection board. Otherwise I can test them for you in a working set here.

dbaisey · Posted: Thu Oct 25, 2007 4:14 pm Post subject:

Dan,
This does sound like a system board or the oscillator circuits have a problem on the deflection board.

You can try to do a new signal entry for 72Hz and put it at the top of the RGB signal list.

72 Hz: One thing before you do a new signal entry is hit the info button on the remote then look at the signal properties to see if it matches your configuration. If your using 5 wire RGBHV it should say SEP sync. Check that. If it doesn't then try the new signal entry.

Make sure the computer is fully booted so it will hit on 72 Hz. Depending on how you have it set up it could be using 60 Hz while booting.

Usually with no signal the menus shouldn't be scrambled if you have a entry for video or pal or some kind of default left that is good. Was this totally reset of lost at some point? Doug

danOO00 · Joined: 22 May 2007 Posts: 70 Location: Putnam County, NY

Doug- Thanks for the info. I did erase ALL memories at one point a while back during a full setup. I will look at the signal properties for SEP sync. I am sure the PC was locked at 72HZ- it is always on, but I will confirm this as well

Curt- Sounds like the plan. I will give it another shot this evening and see what happens. I will let you know if the system and deflection boards are on the way.

Dan

Mark_A_W · Posted: Thu Oct 25, 2007 9:47 pm Post subject:

$5 on the Deflection board. Smile

danOO00 · Joined: 22 May 2007 Posts: 70 Location: Putnam County, NY

I added a new memory for the 1080i 72Hz signal after noticing it was set as COMP and not SEPA sync on the info screen. This has cleared up the main issue where it would take 30 minutes to stabilize. I don't know how this happened, as the memory was created back in May of this year. I am now back at the 3-5 minute warmup time for this input, and I can live with it. One advantage to doing this new signal entry was the fact that I ran through alignment/convergence again, and have improved the overall geometry and convergence a bit.

Thanks to all for the help again

Dan

dbaisey · Posted: Mon Oct 29, 2007 3:29 pm Post subject:

Dan,
Hit the info button and write down the signal properties for your 72 Hz entry. kHz, Hz and sync polarities. Check this from time to time to see if it is stable. I would keep an eye one it and see if it is going to behave or not. Doug

danOO00 · Joined: 22 May 2007 Posts: 70 Location: Putnam County, NY

Will do. Thanks for all the help doug.