|
I let it run for a little while. It doesn't look bad but not enough contrast. The brightness control worked normally, just acted like it needed to be cleaned. The contrast control had no effect, other than make a bit of "static". I cleaned them both. The brightness is smooth now, but the contrast does nothing. The schematic shows that it's a 500 ohm pot, and when I measure it, it goes smoothly from 2-480 ohms so it seems good. When the set is running, there's less than a volt across the terminals of the contrast pot. I guess the next thing is to check R85, L41 and change C3 (which I have).
|