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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Wed Aug 12, 2009 3:05 pm Post subject: Barco graphics 808s no video |
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Hello all....
I have a Barco Graphics 808s that has the following conditions.
Turn it on and you get no picture. You get blue sort of blooming, but no real picture. All G2 lites are lit on the back of the video amps and can not be adj. off. Brightness has no effect. There are no red fault lights lit. All green lights are lit. So it is saying everything is fine. Filiment voltage is present. We took the blue tube out of the picture and still had no red or green. We replaced all three video amps and still have same indications. Talked with Curt and this one is a duzzie.....
Any suggestions?
Steve
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Aug 12, 2009 3:36 pm Post subject: |
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Maybe dead driver or switcher board.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Aug 12, 2009 4:20 pm Post subject: |
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How about internal test patterns?
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Wed Aug 12, 2009 4:48 pm Post subject: |
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There is no internal pattern. No video at all.....Do you mean the rgb driver?
Thanks for any help in advance....
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Aug 12, 2009 4:50 pm Post subject: |
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I suspect the 762719 and 762720 boards, which I think Ile is referring to as well. Possible bad controller board (doubtful), and I was also thinking that it's possible that the tubes died while in storage. I really doubt it, but I have had zero emission Sony tubes here before. Three in a set would be near impossible, but as you know, anything is possible. 
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Wed Aug 12, 2009 4:56 pm Post subject: |
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Thanks Curt...By the way, this is Steve from Quantico.....Did you get my e-mail yesterday?? Concerning the boards we talked about.
Steve
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Aug 12, 2009 6:24 pm Post subject: |
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This sounds like a supply voltage problem. Have you checked the 9v and 17v supply? If ok then the 12v and 5v supply on the input/switcher?
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Wed Aug 12, 2009 7:30 pm Post subject: |
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One thing that would really help in troubleshooting this, is a flow diagram. We tested with an oscope, video in on the video amp (RGB Output/ABL + CRT) is not present. It is a steady 2v dc level. Anybody got a block diagram of this unit?
Steve
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Aug 12, 2009 8:11 pm Post subject: |
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I really doubt its a video problem in itself because it affects all 3 colors.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Aug 13, 2009 6:34 am Post subject: |
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RGB goes
input board (762719) -> driver board (762720) -> neck boards
Check driver board power lines after regulators first, then from input board.
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Thu Aug 13, 2009 7:20 am Post subject: |
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Firmware corrupted?
Projector not respond from remote or fixed control (brightness, contrast, other)?
_________________
Domenico (Barco fan!)
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Thu Aug 13, 2009 12:37 pm Post subject: |
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Quick question....When you don't have any input for video, and you turn on the projector, where is the display you get generated from?? I have 6 other projectors, and I can turn them on and get a raster and a Barco display without any input. Will you get any signal at RGB input? Will your video at the RGB output board have a video signal riding on the 2v level?
Also, how can you tell if your firmware is corrupted and what do you do about it??
Thanks......Steve
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Thu Aug 13, 2009 1:21 pm Post subject: |
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| bassack wrote: | | Also, how can you tell if your firmware is corrupted and what do you do about it?? |
I try to help you 
You said that the projector turn on but not show images.
No identification screen (red Barco logo), no brightness, no adjustment menu, the remote or fixed control not respond (turn on except).
Identification screen, brightness, contrast, adjustment, language, settings and more are resident in the firmware chip (controller board).
So I have thought that it could be a problem of firmware.
Obviously I can mistake ....... like all 
... sorry for my language 
p.s. Which other projectors you have?
_________________
Domenico (Barco fan!)
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Thu Aug 13, 2009 1:29 pm Post subject: |
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Thank you Dom.....Your english is just fine, you wouldn't want me to even attempt to write in Italian!!! How can I check the firmware? If it is bad, what do I have to do? Steve
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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| Posted: Thu Aug 13, 2009 1:42 pm Post subject: |
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| bassack wrote: | | How can I check the firmware? If it is bad, what do I have to do? |
For check firmware integrity you can compare chip content with original firmware file, but you must to have a chip reader.
I have willem programmer for example and I can read (or program) eproms.
If you don't have reader hardware but have another (working) 808s you can try to swap firmware chip (in the controller board there's a 27C080 eprom with label that show firmware version).
_________________
Domenico (Barco fan!)
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Aug 13, 2009 2:19 pm Post subject: |
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| bassack wrote: | | Quick question....When you don't have any input for video, and you turn on the projector, where is the display you get generated from?? |
Start up screen, internal patterns and osd are generated in controller board and then combined to rgb signal in input board (762719).
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Thu Aug 13, 2009 2:41 pm Post subject: |
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Thank you Ile!
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Thu Aug 13, 2009 5:50 pm Post subject: |
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Well now the HV section let loose while we were troubleshooting our no video prob. EHT red lite on. Here is my question. We believe the problem to be the Quad. We have a spare quad p/n R762717 index 6
The one we took out is p/n R7622091 index 5
what EHT module do we have to use with the Quad we are putting in? I know you can't mix old with new
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Decibel
Joined: 31 May 2007
Posts: 904
Location: Roma - Italia
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bassack
Joined: 20 Jul 2006
Posts: 10
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| Posted: Thu Aug 13, 2009 8:17 pm Post subject: |
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Thanks Dom.......
Well thank you to all that have helped up to this point. We now have a display after the EHT Quad went totally bad. We r/r the quad, eht module and the splitter. We get our Barco display and the checkerboard.
Problem now is that the Blue tube has a background that we can't get to go away. also the red and green have a bloom in the top left/center that won't go away????? Brightness will turn off our pattern, but you still get the blooms on all tubes with blue being really bad.
Any more suggestions? Steve
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