Several years ago, a neighbor's branded machine was replaced with a motherboard. It worked well for a long time until three days ago when something went wrong. The first repair involved checking the output tube and replacing it. However, after checking the +B voltage and going through the reverse process, no issues were found. The user took the unit back, but it broke down again within a few days. Upon inspection, the problem still existed. I strongly suspect that the quality of the replacement tube wasn't good. [To be honest, the current parts are not of the best quality.] So, I decided to replace it with the original disassembled line 2253 and carefully checked the relevant circuits. I thought this time it would be fixed, and it lasted more than a month before breaking again. This time, I found a single-line tube damage. Since it was late, I took the motherboard home for further inspection. The tube on the test machine was fine. When I touched the heat sink, it was warm, so I continued to take the machine apart. Everything seemed normal during the startup, so I reinstalled the unit. But just a few minutes after turning it on, the tube failed again. I replaced it once more, and this time, the heat sink became extremely hot. I realized that the problem might have been due to the overheating caused by my own tube being in place for too long. How could it be overloaded now? Was the deflection broken?
With this suspicion, I went home and looked for a deflection sleeve of the same size as the picture tube. When I touched the heat sink, it felt very cool, although the screen wasn't perfectly clear—this was due to the mismatch between the tube and the deflection. After checking the deflection, I noticed that the internal adhesive had burned out. The enameled wire had a dark color but wasn’t severely damaged. I then installed a similar deflection and adjusted the screen, which resulted in a mostly satisfactory image. Later, I deliberately tested a 1651 small power tube as a replacement, and it worked normally, with the temperature rising to a normal range. [Of course, this was just a verification. For long-term stability and reliability, I wouldn't use this tube at the end.]
This issue was repaired multiple times, and the root cause of the repeated tube failures turned out to be the insulation damage of the yoke coil. It was an issue that required careful attention and thorough testing to identify and resolve.
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