I know this thread seems a little old now, But i never did get this thing working.
I got down to replacing the entire neck board, and went through all the resistors in the main circuit for any out of tolerance values or opens. Nothing.
Checked all the transistors for opens and shorts, all seem good. I tested all the electrolytic capacitors with an ESR/DCR check, and found a couple of weak ones in the video circuit, but the rest are good. Swapped the two in the video circuit, it made the image a little bit more crisp, but the convergence issue still resides.
So that eliminated the convergence adj pot, and the neck socket, becuase i swapped the CRT boards between the LC550 and the CC. and no difference.
I'm at a standstill. I need to figure out what in that little analog circuit generates the dynamic convergence waveform that the tube uses for that adjustment to even work. thats where the fault is going to be.
I got down to replacing the entire neck board, and went through all the resistors in the main circuit for any out of tolerance values or opens. Nothing.
Checked all the transistors for opens and shorts, all seem good. I tested all the electrolytic capacitors with an ESR/DCR check, and found a couple of weak ones in the video circuit, but the rest are good. Swapped the two in the video circuit, it made the image a little bit more crisp, but the convergence issue still resides.
So that eliminated the convergence adj pot, and the neck socket, becuase i swapped the CRT boards between the LC550 and the CC. and no difference.
I'm at a standstill. I need to figure out what in that little analog circuit generates the dynamic convergence waveform that the tube uses for that adjustment to even work. thats where the fault is going to be.