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hapien
Joined: 18 Aug 2007
Posts: 4
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| Posted: Sat Aug 18, 2007 10:35 am Post subject: Seeking Barco Graphics 1208s repair advice |
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Hello,
My Barco Graphics 1208s malfunctioned yesterday. After half an hour use or so I heard faint *snap* and red tube begin to drive with full power on entire picture area. Today I tried to locate failure by swapping tube socket circuitboards and it appears to be place to seach further as the fault followed the circuit board when transferred to green tube.
Any advice to help locating malfunctioned component would be most welcome. On visual inspection I did not notice any burn components etc
Thanks!
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sat Aug 18, 2007 12:11 pm Post subject: |
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Most probably it's one of those two VPA13 video packs, those big metal boxes connected to frame.
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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hapien
Joined: 18 Aug 2007
Posts: 4
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| Posted: Sat Aug 18, 2007 1:11 pm Post subject: |
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Thanks!
I`ll try to replace those amps. I was thinking ordering parts from Partco. Any other recommended sources in Finland?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sun Aug 19, 2007 3:09 pm Post subject: |
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| hapien wrote: | Thanks!
I`ll try to replace those amps. I was thinking ordering parts from Partco. Any other recommended sources in Finland? |
That's only place where I have found VPA13 in Finland.
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hapien
Joined: 18 Aug 2007
Posts: 4
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| Posted: Sun Aug 19, 2007 3:23 pm Post subject: |
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Surely as it is branded as such. It appears that red and blue boards may have been replaced at some point, but yet all amps are all the same as in green broad that carries serial indential with rest of the unit.
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hapien
Joined: 18 Aug 2007
Posts: 4
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| Posted: Thu Aug 23, 2007 11:59 am Post subject: |
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Got new amps in place, yet problem remains. Any ideas welcome! Has anyone extra tube socket circuitboards laying around unused?
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BGSPCS
Joined: 23 Aug 2006
Posts: 115
Location: Pottstown, PA
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| Posted: Thu Aug 23, 2007 12:29 pm Post subject: |
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Hi,
I don't really know the 1208, as i have a BG400. Try checking the G2 circuits if it has any.
I had a similar problem with my BG400 where all 3 tubes would get fully lit up every so often, then they stayed fully lit up after a while. I fixed it by replacing the Convergence board(which is analog and contains the G2 board)
I hope this helps.
Have a nice day
Brad
_________________
--
Brad S
Pottstown PA
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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: Thu Aug 23, 2007 1:02 pm Post subject: |
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This is a board that you probably don't want to mess with. When the board is at full brightness, you stand the chance of spotburning the tubes, and I've nuked at least one tube by working on these complex video amps. You've got the expensive Sony tubes in that set that are hard to find in good used shape. I've got spare neck boards for relatively cheap, so I'd do that, and keep your two new chips as spares. I've rarely had the chips fail, and I haven't bothered repairing these neck boards so far as they don't fail often, and as I said, I've got spares.
Cheers!
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