Sony KV-M1411U Video display issues

[zeno]

Try this
Put blue drive back where it was.
Turn color level all the way down.
Put a source on it, composite easiest if it has it.
Measure these CRT voltages at the socket then report back
Use a meter safe to 1 KV DC This usually narrows things down.

R- K
B- K
G- K
G-2