4600 HV Shutdown

mcandrewsoun

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Not sure if this is a bad Flyback or tube or what... When I fire it up I get HV, then it turns off. If I turn it off and then back on, nothing, but my Iso transformer hums like its loaded down. I grabbed a working chassis, to test the tube/fly/neckboard, and am getting the same results.

Has anyone seen these symptoms before? Same damn thing is happening on two different monitors, and Im wondering if a tube that had a short in it blew something up.

Thanks,

Andrew
 
Update..

Pulled the entire working 4600, and started swapping..

From the 2 dead monitors, found a bad tube, a bad flyback a bad XY and a bad interface. So basically one dead monitor..lol. The bad tube has a constant white raster, and the monitor that this tube came from had a melted connector on the neckboard between the screen and ground. Thats also the monitor that had the bad flyback. Seems like maybe the screen circuit got fried and it blew the flyback.

So I have one totally working monitor, and one doorstop.
 
Regarding the bad tube....the tube could be good, and you have a bad yoke (unless you already checked this out). I'd suspect a yoke to cause high voltage shut down before a tube (but anything's possible).

Edward
 
Update..

Pulled the entire working 4600, and started swapping..

From the 2 dead monitors, found a bad tube, a bad flyback a bad XY and a bad interface. So basically one dead monitor..lol. The bad tube has a constant white raster, and the monitor that this tube came from had a melted connector on the neckboard between the screen and ground. Thats also the monitor that had the bad flyback. Seems like maybe the screen circuit got fried and it blew the flyback.

So I have one totally working monitor, and one doorstop.

Bummer :(

That sure is one really dangerous doorstop :001_sbiggrin: :rolleyes:
 
I think a dead winding in the Fly is causing the HV shutdown.. I suspect that the arcing on the neckboard connector caused it to blow.. Maybe a short in the tube caused the connector to overheat, which caused the arcing... Also, maybe a butterfly in china flapping its wings caused a flake of metal to lodge itself in the gun assembly, which caused the short in the tube. ;-)
 
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