Quit to Home Page
What I do with colour cast problems :-
1) check the voltage (with no aerial signal) on the collector of all three video output transistors (on the crt base) they should be +-5v of each other
if one is different, then swap over this transistor with one of the other two
and if color changes, its the transistor, If not then I use a 2k-4k wirewound
and touch it from each collector to chassis in turn, and watch the screen (I use a mirror) each color should be equally bright with flyback lines, if not its probably the tube (CRT) faulty.
2) If all of tests are ok, then I find the three wires coming up from the
the main pcb to the crt base panel and swap over the green/red and see if the
color cast changes
If yes then its the chip on the main board, If no its on the
crt base board, so check values of all the resistors there.
Back to general Faults Menu Page
back to last page