CurtPalme.com Home Theater Forum

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

The blanking signal is common to all three cards so it it works some of the cards it's probably ok. There is a blanking circuit on each CRT card that drives the G-1. The red card looks like it might have something wrong with it's blanking circuit. Hmmm, the streaking issue. Does that only happen with the green card? The only thing I remember that causes that is C1 on the CRT card. Older ones have a small ceramic cap of 0.01uF. It will be about half the size of the one in the pic. Numbers on it will be 103. Later ones had a bigger ceramic cap like the one in the pic. It's 0.33uF Numbers on it will be 334.

Scott

**AnalogRocks** · Posted: Wed Apr 04, 2007 11:52 pm Post subject:

Alright I've swapped in the 2000 convergence boards and now the set won't power up. If I do a 30 CODE I get -25 volts Hi. The two 25 volt lights on the LV powersupply stay lit after I unplug the power.

Did I miss something?

**AnalogRocks** · Posted: Wed Apr 04, 2007 11:53 pm Post subject:

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

**AnalogRocks** · Posted: Thu Apr 05, 2007 2:26 am Post subject:

I took the whole convergence tray apart and put the origional 4000G convergence power supply back in. I also put all the origional 4000 convergence boards back in except the one that handles the blanking. At least the error went away the tubes lit but with only a horizontal line at the bottom ( looking into the lenses)

I also tried for the help menu. All I got was a scambled green.

THen I smelt some magic burning smell so I shut it down.

I'll put the origional stuff ( all of it )back in tomorow.

the -25 error was gone.

**AnalogRocks** · Posted: Mon Apr 09, 2007 4:57 am Post subject:

Right.

I put almost all of the origional stuff back in. With the exception of one of the small boards. Not sure of the function but there are 3 side by each.

I bought the movie 'Crank' that's Grand Theft Auto come to life. That movie is great!

I pushed down on all the chips on the origional convergence board. The thin dark line seems to be gone. The power supplies were running cooler. However about 10 minutes before the end of the movie there was a 'pop' and the blanking on the left side jumped over by 3 inches. Although on the remote it still said 29%.

I'll tear it down tomorow and see if that convergence board poped a capacitor or something.

Anything else I should look for?

Oh yeah and the red neck card still has the diagonal lines. I noticed the Orange G2 wire only has ONE strand soldered to the neck card. Would this cause a problem?

**AnalogRocks** · Posted: Mon Apr 09, 2007 11:08 pm Post subject:

Ok took it all apart and found no burnt anything.
I'm stumped as to why it would do that??

Maybe a heat issue? I had the cover down while watching the movie to keep the fan noise down a little.

EDIT: Spelling

**AnalogRocks** · Posted: Tue Apr 10, 2007 12:55 am Post subject:

Just tried setting it up again. The convergence won't hold. Hmmmmm

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

The six devices attached to the registration amp heatsink have thermal shutdown circuits built in. They will turn off if they overheat. Once cool they will turn back on. So if the green vertical amp overheats the green will jump to the position it is in when registration is turned off. Same for blue horizontal, red vertical.....

Check that the screws are snug, they can loosen over time.

Scott

**AnalogRocks** · Posted: Tue Apr 10, 2007 3:08 am Post subject:

Thanks Scott. I ran it for about 2 hours. I'd do an alignment and within 5 minutes the red and the blue have drifted. I opened it up and snugged all the screws prior to testing today. It was the left blanking that jumped. I couldn't find anything burnt on the blanking board. The spare I have here isn't working.

Also I noticed that red neck card...I'd set the G2 down and when I looked back in a couple of minutes the raster was lit up again.

The focus didn't seem to be there like it was before either. I tweaked and re-tweaked the lenses and the electronic focus and I just can't seem to get it as sharp as before. What would cause this?

**AnalogRocks** · Posted: Thu Apr 12, 2007 11:19 pm Post subject:

Ok I'm going to go to it again tonight. Lets see if the convergence will hold and the Red G2 will stay where I put it.

**AnalogRocks** · Posted: Wed May 30, 2007 4:08 pm Post subject:

Ok long time since an update. I have the CPU board, all 4 neck cards ( 2 old blown R22 ones, and the one with the bad G2 and the Green with the streaking ) and the Quad Decoder/V.sync cards all going back to Curt. Will be mailed out today.

Let's see what he can find.

**AnalogRocks** · Posted: Mon Jul 02, 2007 1:35 am Post subject:

Hi Curt, did you get these yet? If so have you had a chance to look them over?

**AnalogRocks** · Posted: Thu Oct 18, 2007 11:26 pm Post subject:

Wow been a while. I got these boards back last Friday. I put them in on Tuesday night. I powered the projector up and it worked, didn't shut down and ran for quite a while. Then on Wednesday night-from a cold, unplugged start- I got the dreaded HVPS RESTART. It wouldn't restart so I turned off the main power switch and waited 10 seconds. Then it all powered up as normal. I ***HOPE*** it stay's running this time.

**AnalogRocks** · Posted: Thu Oct 18, 2007 11:28 pm Post subject:

Oh yeah. Last night I decided to try 1024x768 at 72Hz, well that was interesting. The top of the picture curves to the left. What causes this? It doens't do it at 60Hz

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

The "technical" term for the curving at the top is flagging. Some video sources output a non standard sync that the projector misbehaves with. Or it might be a mis adjustment on the horizontal processor card. My 4200 (almost identical to 4000) does the same thing with some video inputs. I haven't spent any time chasing it down as my regular sources work right.

Scott

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Does Flagging happen on marquees too? I have the same thing on the top where all the grids from the edges outward curve toward the center and the denter is straght but its only the very top edge of the grids . During viewing i don notice it at all.

Athanasios

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

Different situation. Flagging has the lines all bent in the same direction. It is caused by the projector not being perfectly in sync with the video during the vertical retrace period. After the retrace period the projector finishes "pulling in" to sync with the video.

When the lines curve in (or out) from the center, at the top, it is usually because the circuits that regulate the width have not completed the keystone function during the vertical blanking period and are finishing during the display interval. The new version Marquees don't seem to have much problem with this.

Scott

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Any way to fix it?

Athansios