CurtPalme.com Home Theater Forum

lexx21 · Joined: 10 Oct 2008 Posts: 119

I have a pg6200 that I am starting to setup. The raster on all 3 tubes is bowed at the top and bottom (inward). The pj is setup for front floor use. Can someone give me any ideas as to how to solve this?

**Curt Palme** · Posted: Tue Nov 24, 2009 1:58 am Post subject:

I'll answer once you get rid of that sick avatar Smile

It could be partly normal, otherwise the convergence output connectors on the C board are backwards. Flip each one of the 6 around 180 degrees, and plug back in. That should give you proper convergence control. There should be a sticker inside the main lid showing the orientation of the connectors. To be clear, they are the yellow/brown and red/blue ones on the C board, 6 in total.

lexx21 · Joined: 10 Oct 2008 Posts: 119

No appreciation for the hairy hedgehog eh?

Ok, when you are changing around the jumpers, on the deflection board the color code is meant to be read when you are facing (lens pointing to you) the projector? And on the C board when you are looking at the pj from the rear (lens facing away from you)? Looking at the drawing inside the cover that's what it seems to be saying.

Basically the left and right side are fine, it's the top and bottom that are bowed toward the middle and wasn't something that I could adjust out. I reseated all of the connectors on the C board and that didn't solve it. I'm probably overlooking something really obvious.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

it's the orientation of those plugs...one way or another, it's the plugs.

Elaine Benes · Joined: 25 Apr 2006 Posts: 1416

There's also the plugs UNDER the main deflection board that all need to be oriented properly AND located on the correct pins....

Check the manual.

The pins are labelled, and the color orientation and plug orientation are detailed in relation to the pins in the manual....

lexx21 · Joined: 10 Oct 2008 Posts: 119

Well, I tried all of the combinations of plug orientations on both the C board and the deflection board and I still can't seem to get rid of the inward bowing of the raster top and bottom. The sides are correct though. Any other ideas?

Also shouldn't all three crt's be on on power up with no input? Right now there are only the green and the blue. When I start a grid test pattern on the set (internal patterns) all three light up. Just wondering.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

have you deleted all memories? Then normalized all values? Or reset defaults?

A factory reset may be in order...many will warn that your house will blow up. But I've done them on every NEC I've had and it's often worthwhile for reasons like this.

**Curt Palme** · Posted: Sun Nov 29, 2009 5:36 am Post subject:

Don't worry about what tubes are on or off without a signal

The connectors you want to change are the yellow and brown ones on the C board under the deflection board. make sure a signal is fed to the projector, the set will do strange things without one.

lexx21 · Joined: 10 Oct 2008 Posts: 119

I used a transcanner for the rgbhv input, cleared all memories on the pj, set everything to null, and still have have the same issue. I have played with the plugs on the C board and sweep board in every combination that I can think of and still no change. The top and bottom are still bowed inward.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

take a pic of it and share...

lexx21 · Joined: 10 Oct 2008 Posts: 119

Will do....it wil likely be Wednesday before I can do that, but I will definitely take pics.

benareeno · Joined: 22 Mar 2006 Posts: 1614 Location: ottawa, canada

take a pic of the tube face and a pic of the plugs on and under the deflection board.

Mark_A_W · Posted: Mon Dec 14, 2009 10:23 pm Post subject:

With the correct plug setup, the raster will still be bowed when the alignment/convergence controls are zero'd.

That's what the alignment/convergence controls are for....

If you don't have enough adjustment, you have an issue, but otherwise it's normal.

lexx21 · Joined: 10 Oct 2008 Posts: 119

That's the problem though... I can adjust it out on the sides, but not top and bottom. Top and bottom don't even move. I can see correct video (nothing scrambled) when I pull up the menu on the transcanner. I followed the chart for the plug color code and set it to desktop/front.

I will take pics of the C board plugs and sweep board plugs so you can see what I have.

lexx21 · Joined: 10 Oct 2008 Posts: 119

I swapped the brown/yellow orientation on the C board as Curt suggested. Still the same issue with the top and bottom of each color being bowed inward and not adjusting outward.

I guess that I should also add that I used the dwin transcanner as a source input while trying to make the adjustments. I'm pretty confused here about what to do next.

Elaine Benes · Joined: 25 Apr 2006 Posts: 1416

lexx21 · Joined: 10 Oct 2008 Posts: 119

Ok, here are the pics of the boards. My camera is a pos and I can't get it to change shutter speeds from 1/60 sec, so it picks up only the raster scan and no the whole image on he tube face....ugh!

Describing what is on the tube face.... when I go into a menu, I can read it just fine. The top and bottom are bowed inward. It also does this on the test paterns and affects those patterns since they use the whole area that you have set for your raster.

I tried the plug combination (C board) that was on the label on the inside lid for front desktop. I did it using the component side as a reference and also the back of the board as a reference (left to right reading the colors). The way that it is drawn in the diagram, it seems to be with the back of the projector as the reference so I wasn't sure about that.

I saw in a post that curt replied to over on AVS where he told a guy to reverse the yellow/brown on the C board which is what I have done here in the pics that I posted but I am still having the same issue.

I'm seriously hoping that I don't have a bad board and that it's just a matter of "operator head space" here.

Elaine Benes · Joined: 25 Apr 2006 Posts: 1416

Funny how things work out, eh ?

I just yesterday evening sold my PG Xtra that has been in the garage for over a year...otherwise, I'd just head out there now with a printout of your plug orientation picture to confirm them...Hopefully someone else who still has an Xtra in their possession can confirm your orientation. Sorry...

Just some more info, you *should* be able to confirm your plug orientation is correct by looking directly on the board that they plug into, there is both the actual designation for each plug eg. AG, BG, etc, and the pin number printed right on the board so you can get the orientation unquestionably correct.

lexx21 · Joined: 10 Oct 2008 Posts: 119

I figured out what you were talking about concerning the orientation and now have it correct. The brown/yellow on the C board were backward. I corrected that but still have the same issue with top/bottom bowing. I have pics of the screen faces that I will need to get off of the camera and will upload them asap. I can move the vertical pin cushion to either extreme and still no movement to remove the bowing of any of the tube faces?

Horizontal movement works perfectly.

Would I start looking at the stk pack at the bottom of the C board next? As long as the part is available, replacing the part isn't really an issue for me if that is the most likely suspect in this case.

Below are the pics that I took of the red crt face (all other crt faces looked the same). As you can see, no change once the vertical pin cushion is changed.

Elaine Benes · Joined: 25 Apr 2006 Posts: 1416

Yes, starting off by replacing the STK392-040 chips is the usual tack, I think, I had to do it on one PG I had long ago ....

Got the chips from some place in Georgia...mmmm...Georgia Audio Labs maybe ?