CurtPalme.com Home Theater Forum

km987654 · Posted: Thu Jul 23, 2009 10:28 am Post subject: Convergence Blues

Got a strange problem. Blue will not converge. If you could imaging the screen divided into 3 vertical sections of equal size the left and right parts will not move at all when attempting to converge blue on green. The centre section works fine. I have changed the convergence boards, neck boards, RGB output Amps and RGB input without success. When I say blue does not move I mean it it will not move in any direction except at the centre.

TbX · Joined: 06 May 2006 Posts: 94 Location: Sweden

have you tried changing SMPS

or if it can be a convergence coil

km987654 · Posted: Thu Jul 23, 2009 12:19 pm Post subject:

I have not changed those at this stage but might as well. Not sure how SMPS would have this effect though. I guess you mean deflection coil??

TbX · Joined: 06 May 2006 Posts: 94 Location: Sweden

SMPS gives power to the convergence amp

they sit together under plastic cover

TbX · Joined: 06 May 2006 Posts: 94 Location: Sweden

a sorry now I read that it was the only blue

you had changed the whole convergence tray

km987654 · Posted: Thu Jul 23, 2009 9:38 pm Post subject:

Yes its only the blue that one of the interesting things and its only part of the blue!!

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Huh. I was going to take a look at the diagrams to lend a hand on this but I see I dont have them. Is the 1101 similar to other Barcos or is it a beast of its own?

km987654 · Posted: Thu Jul 23, 2009 11:10 pm Post subject:

1101 is similar to 801s and thanks for any assistance here.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Ok, I took a real quick look. I'm also assuming you have spare boards from what I read. Do you have a controller board to try?

km987654 · Posted: Fri Jul 24, 2009 2:13 am Post subject:

I have another controller. I did already swap this out. The part numbers are the same but the firmware is different. The other controller caused different problems but I cannot recall if this was a problem with that controller. The other controller pushed the image to one side of the raster and it would not move. It caused what looked to be a folding edge on the side that the image was squeezed up against.

Both controllers are from BD801s as are most of the boards I have the convergence tray is the later two board setup. This solution has occured to me and I was thinking I might need a BG801s control board but there does not seem to be any around.

km987654 · Posted: Sat Jul 25, 2009 6:52 am Post subject:

I should add that the PJ was an 1100. I replaced the frame with an 801s and all associated boards to bring it up to 1101 spec. The control board was installed before the upgrade but with a different convergence board (the single board type). I have since re-installed the old convergence board but this had no effect on the problem. I am also using the 75Mhz RGB outout amps from an 808, I have re-installed the 801 Output Amps but this had no effect.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

km987654 · Posted: Sat Jul 25, 2009 10:20 pm Post subject:

km987654 · Posted: Sun Jul 26, 2009 6:03 am Post subject:

OK

Swaped out the control board and with the replacement Blue will not converge at all. Where as the other control board provides convergence at the centre of the screen this one does not. The difference between the two control boards is the RWI chip the one that provides some convergence is V4.04 and the other is V4.03. Not sure why the Real World Interface would have this effect!!.

The control software in both cases is V5.12

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Alright, I did some more in depth investigating into this and there can really only be 3 possibilities. The controller, the convergence output board or a convergence coil as TbX suggested. Note that I stated convergence output and not convergence driver. I'm assuming you know which one is the convergence output and is that one that you did change? If so then here's what I would try.

Put the controller back in that gives you partial blue adjustment. Now swap the wire harnesses to the blue and green convergence coils. Now try your adjustments again and see what does and doesn't work between the blue and green. Remember that now when you adjust blue in the menu the green grid will change and vise versa. Post results.. Smile

Or if it wasn't the convergence output that you changed, you need to try that.....

km987654 · Posted: Sun Jul 26, 2009 9:25 pm Post subject:

I have swaped both the convergence Output and Driver boards at different times with the same result. The set thats in the projector now is the one that gives partial blue convergence. I will try the convergence coil harness changes you suggest and I will post the results.

km987654 · Posted: Mon Jul 27, 2009 9:57 am Post subject:

OK I did get energetic and I replaced the convergence coil on blue with a spare. The result is slightly improved convergence. There is an increase (slightly) in the number of areas blue now converges but there is still a significant area on the right side that does not. I am not sure what to make of this result though????

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I'd still like to hear the results from a wire harness swap on those convergence coils....

km987654 · Posted: Tue Jul 28, 2009 8:24 am Post subject: