Hello everyone,
I recently purchased two Blast City cabs from KC with 2931's in them. A friend of mine visually guaranteed they both worked before shipment, but upon arrival one of them has no image, the other still works fine but it's a bit dim and the colors are fairly muted. I pulled the tube and chassis along with all the wiring and PSU out of the non-working cab and got it setup on a table and confirmed that the monitor doesn't have any HV squeal but the degauss coil clicks whenever it turns on. As further testing, I swapped the working chassis onto that tube and was able to get a similar dim and muted picture on the tube, so it seems like there's something wrong with the chassis. Research for similar issues indicates it's probably the HOT, but I'm not sure how to go about confirming that, and even if I did confirm it I'm not super sure how to fix it. The chassis itself was extremely dirty so I've cleaned it off and removed the dripped potting compound, but still no luck. I'm a bit lost when it comes to electronics other than basic soldering and multimetering and I'm just kind of looking for what direction to go in now.
My thoughts are at this point to purchase a working chassis (probably a weiya or something similar), but I'm not sure where to source one, and use that chassis as a backup in case I can't fix the 2931 chassis. Reason for doing that would be to learn more about the chassis repair process for when the inevitable happens on the other. The other option obviously is to just not learn and send it off to Sharp Image for repair.
Any help or resources you wonderful people could point me towards would be greatly appreciated. If you'd like pictures or video let me know and I'll be happy to provide them. As a side note, is there anything that will actually dissolve that potting compound? There's a plastic bit that sits in the chassis area of the tube that is basically glued down by the stuff that I can't get to with acetone and a qtip/toothbrush which is making it very difficult to swap chassis(pl?) in and out.
Thanks in advance!
I recently purchased two Blast City cabs from KC with 2931's in them. A friend of mine visually guaranteed they both worked before shipment, but upon arrival one of them has no image, the other still works fine but it's a bit dim and the colors are fairly muted. I pulled the tube and chassis along with all the wiring and PSU out of the non-working cab and got it setup on a table and confirmed that the monitor doesn't have any HV squeal but the degauss coil clicks whenever it turns on. As further testing, I swapped the working chassis onto that tube and was able to get a similar dim and muted picture on the tube, so it seems like there's something wrong with the chassis. Research for similar issues indicates it's probably the HOT, but I'm not sure how to go about confirming that, and even if I did confirm it I'm not super sure how to fix it. The chassis itself was extremely dirty so I've cleaned it off and removed the dripped potting compound, but still no luck. I'm a bit lost when it comes to electronics other than basic soldering and multimetering and I'm just kind of looking for what direction to go in now.
My thoughts are at this point to purchase a working chassis (probably a weiya or something similar), but I'm not sure where to source one, and use that chassis as a backup in case I can't fix the 2931 chassis. Reason for doing that would be to learn more about the chassis repair process for when the inevitable happens on the other. The other option obviously is to just not learn and send it off to Sharp Image for repair.
Any help or resources you wonderful people could point me towards would be greatly appreciated. If you'd like pictures or video let me know and I'll be happy to provide them. As a side note, is there anything that will actually dissolve that potting compound? There's a plastic bit that sits in the chassis area of the tube that is basically glued down by the stuff that I can't get to with acetone and a qtip/toothbrush which is making it very difficult to swap chassis(pl?) in and out.
Thanks in advance!