Quote:
Originally Posted by old_tv_nut
The on-screen display is triggered internally and will always be OK even if the video sync is wrong.
I don't know enough about this chassis to speculate where you are losing sync. The odd thing to me is that vertical sync seems OK while H sync is off and free running at slightly the wrong frequency. Since it is free running, it's not surprising that touching or pressing things would change the frequency.
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Thank you, that at least confirms my suspicion that’s it’s some kind of sync issue. If it helps anyone to help my diagnose I did manage to track down the schematic for a JVC that has exactly the same model number of control board. From my best guess on what I’m seeing it seems like the component input bypasses the video selector IC entirely and goes straight to the main IC, so if that input is also causing it it must have something to do with area? But wouldn’t the coax signal also have issues if that chip was bad? Here’s a link to the pdf:
https://www.icloud.com/iclouddrive/0...d104_av-27d304