Quote:
Originally Posted by luRaichu
I don't have a scope or frequency counter 
As I said, there's 12v on Q554's emitter which means the H osc. disabling circuit is activated (which is what's deliberately throwing H sync off as a "safety feature"). I don't know why it's activating though. Could be excess HV?? |
Idk for absolute certainty, but I would suspect that using the bulb or a Variac could prevent the Hor oscillator from starting, which could in turn throw off voltages inside the set, or maybe do something weird with the "disabling circuit," especially if there's still something else wrong
There are some low cost scope options for someone on a budget that will at least give you some feedback. For around $100 you can get a little handheld battery powered one that will be high enough to capture the bandwidth of a crystal. Check out this video
https://www.youtube.com/watch?v=iG0-0R9qYWU
The cheapest one only goes up to 200kHz, so I would probably avoid it.