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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Mon Aug 31, 2009 12:24 am Post subject: Barco 1208 red tube stopped working |
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Can anyone give me some tips on troubleshooting why my red tube is not working? I believe it gets high voltage as it makes the crackling sound like the others when I power it on. I can see some light at the back (yoke?), but it is dark or maybe just faintly illuminated raster. I swapped the red and green bnc and still nothing from red.
Any help would be appreciated.
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 12:42 pm Post subject: |
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Well, I swapped the CRT boards between blue and red and the problem did not move. Can anyone think of other steps I could do to isolate the problems? Or is it just a bad CRT?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 2:04 pm Post subject: |
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What bnc's do you mean you swapped? The input ones. Does the red work with the internal test patterns?
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 2:08 pm Post subject: |
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I swapped the input video BNC's on the back of the projector, red and green, Still no image on red, but had image on green. I also, with the cover open, swapped the RCA inputs to the CRTs between blue and red, red still not video. Maybe very faint video, almost nothing.
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 2:15 pm Post subject: |
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hey I do get a red genlock convergence pattern. So CRT can't be bad, right?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 2:39 pm Post subject: |
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So with the genlock pattern you have a strong grid on all 3 tubes?
Try swapping the RCA's on the crt boards between the green and red and post what you get on both red and green with video
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 3:17 pm Post subject: |
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It appears that only the green RCA connect is carrying any video when showing an external video source.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 3:20 pm Post subject: |
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| wellborn2001 wrote: | | It appears that only the green RCA connect is carrying any video when showing an external video source. |
?? Does that mean the red came on with the swap?
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 4:05 pm Post subject: |
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I can't reach the red with the RCA connector, but the blue came on with the green connector. All of them display internal pattern.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 4:24 pm Post subject: |
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If they are all displaying the internal test grid then you either have a source problem or an input board problem.
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 4:38 pm Post subject: |
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I can take any of the red, green, blue external bnc connectors and put them on the green input, and get video on green. The internal pattern definitely shows on all 3 CRTs. Where is the input board?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 6:01 pm Post subject: |
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Thanks, macgyver655! I appreciate your time.
Curt, any thoughts on whether the RGB switcher has gone bad on my set?
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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: Fri Sep 04, 2009 7:48 pm Post subject: |
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It could be the switcher board, but the 1208s have a unique problem of the shielded cables snapping under the motherboard where they connect to the module connectors of the RGB switcher board. Luckily, taking the bottom case part off the set isn't too bad, but the set does have to come off the ceiling. I just sold a 1209s where that happened between here and Florida.
THere are 6 large bolts inside the set that hold the case bottom to the chassis. One is located about midway under the R and B tubes. Two are outside the tube/lens area on the outside of the chassis frame, but within the case bottom, and the other two are under the AC input module and the H shift/focus board. THey are large 8mm hex bolts.
Pull those out, then flip the set over. There are between one and three slot screws in the keypad area that screw the keypad to the case bottom. Remove those. REmove the convergence tray.
That should allow the case bottom to come off completely.
Look at the center conductor of all shielded cables running from the BNC input connectors to the video boards. I'll bet one has snapped, and the centre wire isn't connected. Carefully strip the remaining wire back, and resolder.
Done.
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 8:14 pm Post subject: |
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Curt, this set has been in and working for 5 years. Would those just snap with nobody messing with it? Both Blue and Red are not getting any video signal.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Fri Sep 04, 2009 8:28 pm Post subject: |
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| wellborn2001 wrote: | | It appears that only the green RCA connect is carrying any video when showing an external video source. |
Are you using a transcoder and what are you using as an input ? Are you using input 3 or 5 on the projector ?
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 9:26 pm Post subject: |
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I'm using input 5 on the projector with an HDFury. But the problem, I believe is in the projector, because any of the 3 RGB signals I put in on the Green external BNC, I get a green video signal.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 9:29 pm Post subject: |
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| Curt Palme wrote: | It could be the switcher board, but the 1208s have a unique problem of the shielded cables snapping under the motherboard where they connect to the module connectors of the RGB switcher board. Luckily, taking the bottom case part off the set isn't too bad, but the set does have to come off the ceiling. I just sold a 1209s where that happened between here and Florida.
THere are 6 large bolts inside the set that hold the case bottom to the chassis. One is located about midway under the R and B tubes. Two are outside the tube/lens area on the outside of the chassis frame, but within the case bottom, and the other two are under the AC input module and the H shift/focus board. THey are large 8mm hex bolts.
Pull those out, then flip the set over. There are between one and three slot screws in the keypad area that screw the keypad to the case bottom. Remove those. REmove the convergence tray.
That should allow the case bottom to come off completely.
Look at the center conductor of all shielded cables running from the BNC input connectors to the video boards. I'll bet one has snapped, and the centre wire isn't connected. Carefully strip the remaining wire back, and resolder.
Done. |
Curt, I think your forgetting that he has internal test patterns on all 3 tubes. Broken cables cannot be the problem or he wouldn't have patterns either.
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wellborn2001
Joined: 13 Feb 2009
Posts: 35
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| Posted: Fri Sep 04, 2009 9:38 pm Post subject: |
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Do you think somehow that the HDFury is now bad? I still have my old Audio Authority Component to RGB 9A65 Converter, but now that I've updated to the Onkyo receiver, I've gotten rid of the 9A65 and the Lumagen and gone pure HDMI. So I really would not want to go analog again.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Sep 04, 2009 9:46 pm Post subject: |
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Are you using 5 wire RGBHV out of the fury to port 5?
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