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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Oct 07, 2009 2:43 am Post subject: what is this? |
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Been trying to nail down a problem on Moby's machine. This is the one that had a shaking raster, HVPS failure, spot burned a red tube and then I did some board work on the 8 modules I work on. At least that seems the most likely chain of events. I've had all 3 VNB's here, the LVPS, control module, and just recently got the FGM. I can;t get anything abnormal to happen here and i've been running the hell out of these parts.
There is one thing that concerns me and it's this little add-on done presumably by the Company that prepped the machine for VR. IT's some kind of German Geometry tweeker and it was lumped to the board with big globs of solder. It jumped R86 and picked board traces between U3 and U5. That's it, 4 wires. Anyone care to guess whether this could have caused any of the symptoms above, not including the HVPS failure of course?
Removing this thing seemed to maybe clear up softness to the pic, but I didn't see concrete changes.
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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 Oct 07, 2009 2:46 am Post subject: |
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Yes, it's a mod for top and bottom pin and bow. The switches allow you to set 'off' to 'strong'. I'd assume it's for various amplitudes of bow and pin to compensate for various screen curvatures. Can't see that the box would spot burn a tube though.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Oct 07, 2009 2:57 am Post subject: |
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| Curt Palme wrote: | | Yes, it's a mod for top and bottom pin and bow. The switches allow you to set 'off' to 'strong'. I'd assume it's for various amplitudes of bow and pin to compensate for various screen curvatures. Can't see that the box would spot burn a tube though. |
no not directly but I noticed the FGM and VNB's share a couple of rails, was hoping that if there was a problem on this thing it could adversely affect the power to the VNB's but it's reaching. I have a bad feeling that whatever is wrong with this machine is still there, in frickin Denmark. 
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