30 Aug
2015
30 Aug
'15
1:29 p.m.
Do you mean no
picture or no raster? To me the 'picture' is the video
modulation (that makes different bits of the screen light or dark). If you
turn up the brightness and contrast controls do you get any illumination on
the screen?
The screen is entirely black no matter what I do with brightness and
contrast controls. The CRT pins
(from memory) are as follows (All voltages guessed wrt ground):
1: Control grid (10's of V, +ve or -ve)
225mV
2: Cathode (10's of V +ve)
170mV
3,4 : heater. One is ground, expect 12V or so on
the other
3 : 12V
4: Ground
5: Control grid (see pin 1)
225mV
6,7 : I call them anodes, you call them grids
:-). Expect a few hunded volts on each pin.
6: 7.33V
7: 10.29V
What voltages do you measure?
I checked all those with respect to ground ( pin 4).
-tony