CurtPalme.com Home Theater Forum

winny · Posted: Thu Feb 13, 2014 10:41 pm Post subject: Scan failure on BG1209/2

Thought I better start a new thread for this since it's a completely new and separate problem from the other.

After pulling the tubes for new silicone and housings but no electrical changes what so ever, I got some very strange scan problems. Started with just the blue tube while the red and green showed the line pattern and logo at start-up. Opened it again and checked all connections and tried again and now I have the same problem on all three tubes. If its any help, it stoped responding to the remote control as well when it happened.

Due to dark conditions and crappy cell phone camera, the shutter time is too long for the pattern to show clearly but it looks like a saw-tooth line with low amplitute at the very top of the tube face, partially outside the phosphor area. I took a video of it which I will try to extract something useful out of tomorrow.

Any ideas?

[img]http://www.curtpalme.com/forum/download.php?id=17914[/img]

**Curt Palme** · Posted: Thu Feb 13, 2014 11:28 pm Post subject:

That's the AKB line (auto brightness). Completely normal on all Barcos.

Press the recessed key on both the remote and keyboard (separately), then press 0,0,0. that will reset the projector and remote to address 0, and it shoudl work again.

winny · Posted: Fri Feb 14, 2014 8:45 am Post subject:

Much better! Thanks a lot!

The fringe scan line is still present though... Just mask it out?

km987654 · Posted: Fri Feb 14, 2014 9:10 am Post subject:

Your deflection coils need rotating.

Decibel · Joined: 31 May 2007 Posts: 904 Location: Roma - Italia

The rasters appear too low.
Ignore the lines for now and start to center (and straighten) the rasters.
- Reset the projector to midpoint values.
- Rotate the deflection yokes for straighten the crosshatch, especially horizontal lines (ignore the curved lines in the edges that are normal).
- Set focus to value 57 then move forward/backward the focus yokes until the focus will be best as possible.
- Center the raster with cpc magnets (flare/astigmatism).
- then ...
... you're just at the beginning of the long process of setup Wink

**Curt Palme** · Posted: Fri Feb 14, 2014 2:39 pm Post subject:

Decibel is right. Normally that line is over the edge of the tube face. With your raster shift being too low, you can see it.

Go into the service menu and do a 'set to midposition'. That will clear out the memory location. Also, at this point you need to send a signal to the projector once you start setting the projector up.

km987654 · Posted: Fri Feb 14, 2014 9:07 pm Post subject:

You need to do a complete setup. After clearing the memory blocks use the cross hair pattern to centre the image and if vertical alignment isn't there use the trim pots on the vertical board to adjust the height of the red and/or blue.

winny · Posted: Fri Feb 14, 2014 9:29 pm Post subject:

Set to mid position.

I'm still waiting for the setup guide DVD which I hope will bring some valuable insight for how to do the setup. Hopefully it will arrive next week, otherwise I will do a preliminary setup to evaluate the throw distance and blue wear.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

You know, if you wipe out every memory block, connect your source, wait for sync, converge, and the exit, that will become the default setting for any new source.

You can also copy settings from an inactive memory to the currently active one.

Another thing you can do is use the internal pattern to converge any source, if you so desire. It may not result in perfect convergence with the source though, so youre better off using a test pattern from the PC if the internal patterns leave you short of perfection.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Why is your green still tilted? Sort that out before you get any older.

winny · Posted: Sat Feb 15, 2014 1:24 pm Post subject:

Will try that. Thanks!

I only had a few minutes to spare before I had to leave when I took the photo. Will continue on Monday. I'm still reluctant to adjust it mechanically during operation since the flashover in the 808.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Youll be fine mate, if you get a boot off it, we will know i was wrong Laughing

winny · Posted: Sat Feb 15, 2014 10:52 pm Post subject:

That would be something. Draining all your energy, time and money for years, taking up all available floor space in your home, slowly poisoning you with glycol, irradiating you with X-rays and when you are finally almost done it fires off 35 kV and kill you. Ha! Take that you easy to use and cheap DLP.

I have several colleagues which used to work for ABB building high voltage stuff but none of them had any high voltage gloves. They all suggested three pairs of washing gloves and not touching the chassis.

winny · Posted: Tue Feb 18, 2014 8:39 am Post subject:

Ok, rotated the coils yesterday so now they sit straight.
There are a lot of things which needs immediate adjustment - G2 on green needs to be lowered and vertical offset on blue and red both needs to go higher to match up with green.

Could someone helpful add some arrows to show which pot does what in this picture?

Decibel · Joined: 31 May 2007 Posts: 904 Location: Roma - Italia

- H shift board
There are two (very) little trimmers that shift blu and red rasters horizontally.

-Vertical board
There are two (very) little trimmers that shift blu and red rasters vertically.
There are also two (plastic white) trimmers that expands (or tightens) blu and red rasters vertically.

- SMPS board
There's a trimmer (plastic white, not sealed) in daughter board that expands (or tightens) the raster of ALL TUBES horizontally.

**Curt Palme** · Posted: Tue Feb 18, 2014 2:28 pm Post subject:

Just a reminder that the main site is full of good information:

http://curtpalme.com/Barco808_Layout3.shtm

Smile

winny · Posted: Tue Feb 18, 2014 3:41 pm Post subject:

**Curt Palme** · Posted: Tue Feb 18, 2014 4:02 pm Post subject:

No worries! Very Happy

winny · Posted: Tue Feb 18, 2014 6:59 pm Post subject:

Before I run it too long, is the top side fan suppose to run at normal room temperature or am I slowly frying my convergence driver?

**Curt Palme** · Posted: Tue Feb 18, 2014 7:06 pm Post subject:

Yes it is supposed to run all the time.