Hi;
I rebuilt a beat Deflection PCB and a pretty good HV PCB, all caps and transistors, a couple of diodes and resistors as well - All fuses replaced and the bridge rect. too.
Anyway, I fired it up and I got a pic with retrace lines all over the place and once shut down, a small spot in the center that dashed across the screen before fading. Brightness and Contrast had no effect at all.
I pulled the HV and Def PCB for a going over and once reinstalled, no pic....
I had:
Def chatter
Neck glow
Fuses good
B+ 40v
91v
408v
and 408 on the focus
12Kv on the CRT
But no pic. I tried the brightness and contrast, no effect.
I pulled the Def again and went over the Z channel and check all the components in circuit - looks good. I put the board back into the Electrohome and back to all the retrace lines, contrast and brightness, no effect again......
I placed a known good def PCB in the monitor and all is well.....
Does ANYONE have ANY ideas of what could be causing this on again / off again situation with the def PCB??!?!?!?
Thanks in advance....
Jeff
I rebuilt a beat Deflection PCB and a pretty good HV PCB, all caps and transistors, a couple of diodes and resistors as well - All fuses replaced and the bridge rect. too.
Anyway, I fired it up and I got a pic with retrace lines all over the place and once shut down, a small spot in the center that dashed across the screen before fading. Brightness and Contrast had no effect at all.
I pulled the HV and Def PCB for a going over and once reinstalled, no pic....
I had:
Def chatter
Neck glow
Fuses good
B+ 40v
91v
408v
and 408 on the focus
12Kv on the CRT
But no pic. I tried the brightness and contrast, no effect.
I pulled the Def again and went over the Z channel and check all the components in circuit - looks good. I put the board back into the Electrohome and back to all the retrace lines, contrast and brightness, no effect again......
I placed a known good def PCB in the monitor and all is well.....
Does ANYONE have ANY ideas of what could be causing this on again / off again situation with the def PCB??!?!?!?
Thanks in advance....
Jeff
