A project to give an old television a new life. The idea was to control the deflecting coils with self made electronics, while leaving the rest of tv untouched to do the acceleration of the electrons. The next step would be to switch the electron beam on and off, in order to have full control over the projections. The television I found was waiting for the dump, in the rain. The inside is completely corroded, but the outside still looks great. When I tried to power it up, the fuses blown immediately, even when the internal power supply circuitry was detached from the rest of the electronics. I do not have any schematics and the cluttered wiring with illogical connections didn’t really help when solving this problem. Fortunately, the TV also had a 12V inlet, so I was able to use an external power supply. This one also switched to its protection state immediately. The only thing left that could be the problem was a huge capacitor directly over the inlet, generating quite a large start-up current. I decided to remove it, and the external power supply didn’t automatically turn off anymore. Then I connected the main print again, containing the CRT control circuitry. The power supply gave no sign of short circuits, but I didn’t see an image on the screen. The flyback transformer did peep, but very irregular. The high voltage diode after the last stage of the flyback became so hot that the plastic around it melted. I have no idea what the problem is. Broken flyback? maybe I can use another flyback to get the tube working again, but this old model is hard to find. I don’t know if the modern flybacks will work here. Besides, there’s a big chance that the CRT itself is also broken. Hopeless project? Maybe. I can always make a fishbowl out of it.
This is the old tv
Started in July 2010