Small monochrome CRT monitor issues
Lets try this again. Cmon, google, post!
I have a little 4.5" monochrome CRT Display in a deposition controller I have. It runs on 12v and uses NTSC. Pretty generic. Its Dead. I have high voltage, getting about 260v to the screen grid, filament is glowing. Scope shows activity on horizontal and vertical deflection. I can see the amplified video signal at the cathode on the tube. What am I missing? Not enough HV? Poisoned cathode? Checked the video output with another display and the video is good. If all else fails I will just run an external display. |
Small monochrome CRT monitor issues
"Jerry Biehler" I have a little 4.5" monochrome CRT Display in a deposition controller I have. It runs on 12v and uses NTSC. Pretty generic. Its Dead. ** As already suggested by Ian - you likely have no EHT. Know anything about CRT displays ? ..... Phil |
Small monochrome CRT monitor issues
On Wed, 3 Aug 2011 12:18:07 -0700 (PDT), Jerry Biehler
put finger to keyboard and composed: I have high voltage, getting about 260v to the screen grid, filament is glowing. Scope shows activity on horizontal and vertical deflection. I can see the amplified video signal at the cathode on the tube. What am I missing? Not enough HV? Poisoned cathode? If you hold the scope probe near the face of the CRT, do you see a flyback pulse? Does the FBT have a stick diode in its EHT lead? - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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