| Electronics > Repair |
| Fix vertical hold on a monochrome monitor |
| (1/7) > >> |
| rea5245:
Hi, I have a monochrome monitor with a beautiful amber display, but I can't get the vertical hold to stay put. It's a Magnavox 7BM623 074T. I can carefully find a sweet spot for the V Hold to stop the screen from rolling, but if I turn the computer and monitor off then on, it loses the hold and starts rolling slowly. I've replaced all the electrolytic caps and the V Hold potentiometer. The problem remains. Anything else I can try? Thank you, Bob |
| bob91343:
You would get better results if you had a schematic. The synchronizing pulse for the vertical oscillator is apparently weak or nonexistent. You need to find that circuit and troubleshoot it. |
| PKTKS:
--- Quote from: bob91343 on June 11, 2021, 05:48:00 am ---You would get better results if you had a schematic. The synchronizing pulse for the vertical oscillator is apparently weak or nonexistent. You need to find that circuit and troubleshoot it. --- End quote --- That is true.. When you *CAN* pause the rolling even for a second... it means the local oscillator is perfect but you have problem w/the sync integrator.. Just try to find hard that part of the circuit... The fault should be at the integrator. Paul |
| rea5245:
--- Quote from: bob91343 on June 11, 2021, 05:48:00 am ---You would get better results if you had a schematic. --- End quote --- Yeah. Alas, I do not, and Google can't find one either. |
| themadhippy:
I thought the correct fix for a rolling crt display was a sharp thump on case,or does that only apply to televisions? |
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