Another KCS47 Restore...No High Voltage/B+ Down 25V

[Chris K]

Wow thank you so much for that! Tonight’s tale…replaced the fuse and found the probable cause for the low HV. The replacement flyback is NOS but looking more closely at it, the cap clip lead for the 6BG6 was barely hanging on to its solder point by a couple of strands of the wire. It had been covered by heat shrink and when I pulled that back I discovered it. Resoldering that connection resulted in the HV going up to 10KV. I had full deflection in both orientations. Then…another disaster. I smelled smoke and saw light from under the chassis from around the AC line in plug close to the power transformer. I still had full B+, an image on the screen and a stable horizontal waveform. I quickly shut things down and investigated it I couldn’t see any evidence of it problem. I turned it back on and got the same magic emanation. My concern of course is the transformer but there was no discoloration around the port for the wires and no hot spots. The B+ and the screen image came up fine again. Tomorrow I’ll have to power it up without the CRT and yoke on edge so I can identify the source. This chassis has had extensive work done on it over its lifetime. I don’t think more than a couple of caps are original and there’s lots of solder blobs on poorly done work. The adventure continues!

[Kevin Kuehn]

Sounds like you're making good progress. You should not have to remove your test CRT and yoke while operating the chassis on it's side. As long as you have everything secure it should be just as happy on it's side. When I work on a set it spends most of it's burn it time on it's side. The only problem is getting a stiff neck if you try watching it for long periods.

[Chris K]

The short was in the insane wiring out of the transformer where there was hardly any space for the deteriorating 12 wires coming out of a very small transformer opening right into and down past an edge of the chassis that was sharp. This is a very bad design. Makes me worry about my working TV and what might be going on with that mess.

[Kevin Kuehn]

That's not a normal problem. Once a transformer is installed at the factory there's ordinarily no movement of the wires that would fatigue them like that. Somehow that one has been roughed up over the years, either pulled for some reason or a replacement pulled from another chassis. Looks like you've come up with a good solution.

[Chris K]

Like I said, this TV has been worked over multiple times quickly and sloppily. There was a burn mark on the chassis where it was shorting. The wires in this set are in some of the worst condition I've seen. Some of the insulation is simply crumbling off.

[Kevin Kuehn]

So this is the last set with the good CRT, that looked so nice on the outside, and said that it worked in the ad?