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Nanao MS-2933 Issue after taking it in for Repair at PNL

incase anyone needs to know this is basically the block of caps your looking at for vertical. Around the vertical IC.

There is also a red mylar cap in front of the output Ic may be out of spec (odd for a mylar but I have seen it)

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Unfortunately, after a couple months, my monitor is starting to curl. It only happens after about 10 minutes of playing. It only happens on 31khz. I’ve yet to test the 15khz mode. But if I reset it, it will be fine until it’s on for another 10 minutes.

I will reach out to John again at PNL, but was wondering if this is a cap that I can fix? Apparently, John replaced EVERY cap on the chassis.
 

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With what you've spent and will continue to spend sending this off to John, I'd recommend getting a working chasiss at this point. Don't wanna risk that chassis failing and taking out the tube. Then you'll have a nice paper weight Blast unless you have a spare tube, access to a spare tube off a game or a D9200 handy.
 
I agree send it back for an inspection again. This is having to do with vertical drive circuits in some capacity. Usually its a capacitor that causes curl but could be a passive could be the actual IC.

I wouldnt worry about the tube being taken out from this. This doesnt look like a HV issue. The reason the tubes die on these is if the flyback is failing and shorts theres a CHANCE that the shutdown circuit doesnt catch the short and shut down fast enough. The HV ramps up too high and it arcs internally into the gun of the tube. Killing the tube and the heat usually cracks the neck.
Rare occurance but it deals with failing flybacks and HV not geo deflection circuits.

However I also would not really continue to run it like that for longer than needed to test stuff because it could be stressing other parts out in the drive deflection or drive.
 
GeekMan1222 said:
I agree send it back for an inspection again. This is having to do with vertical drive circuits in some capacity. Usually its a capacitor that causes curl but could be a passive could be the actual IC.

I wouldnt worry about the tube being taken out from this. This doesnt look like a HV issue. The reason the tubes die on these is if the flyback is failing and shorts theres a CHANCE that the shutdown circuit doesnt catch the short and shut down fast enough. The HV ramps up too high and it arcs internally into the gun of the tube. Killing the tube and the heat usually cracks the neck.
Rare occurance but it deals with failing flybacks and HV not geo deflection circuits.

However I also would not really continue to run it like that for longer than needed to test stuff because it could be stressing other parts out in the drive deflection or drive.
Click to expand...
I went back to John and he pulled the flyback and chassis from my monitor. He's gonna work on it for a few weeks. I'll keep you posted.
 
I had over a year of back-and-forth with a 2933 and PNL.
  • Tube was bad. Replaced that.
  • Chassis was recapped. But ended up an IC chip was bad. Replaced with a 2931 chassis.
  • 2931 was having issues. Recapped.
  • During this time was able to get a nice, working, 2930 from @garou81 (thank you again!)
  • Flyback ended up being bad. Replaced that.
  • Now it's a beautiful spare monitor.
PNL did a great job. But it was also rough for me to keep going out to Covina.
 
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