How to retire Konka color TV - android - Phones Developers
I was working on a Konka HDTV, and the first thing I noticed was that three indicators were off. The power indicator was on, but when I checked the cover, the main voltage was only 20 volts. After disconnecting the main load, the voltage returned to normal. Based on routine checks, the line tube didn’t seem damaged. However, even after removing the line tube, the voltage remained very low. But when I disconnected the high-voltage package, the voltage came back to normal. Was the high-voltage package faulty? I took a closer look at the fourth foot of the high-voltage package, which was grounded. There was some solder residue, but I didn’t pay much attention to it. After removing the high-voltage package for inspection, I found that all the pins were intact—except for the ABL pin! So I decided to replace the high-voltage package. I ordered one from Taobao, and after waiting for several days, it finally arrived. Once installed, the high voltage built up, but the screen still wasn’t bright. What’s going on?
I measured the filament voltage again and it was normal. Both the positive and negative 14 volts were also normal. Waited a minute or so, but the filament still wasn’t glowing. Re-checked the filament voltage—it was still normal. Could there be something else wrong? I removed the rear panel and tested the resistance of the filament. The reading didn’t show any issues. But then I realized—there was an open circuit in the filament itself. I couldn’t believe it at first. I used a high-resistance meter to check again, and it confirmed the filament was broken. After talking with the user, I had no choice but to give up the repair.
It seems like the filament being broken wasn’t a coincidence. But how is it connected to the high-voltage package? Could the grounding pin of the high-voltage package have caused an open circuit, allowing the main voltage to directly reach the filament? It’s still unclear, but this experience taught me to always double-check every component, especially when dealing with high-voltage circuits. Sometimes, the simplest things can cause the biggest problems.
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