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I not have a photos, but I can confirm the logical board is the guilty. This board control all parameters of the monitor, voltages includes. If the logical part (cpu and eprom) going crazy, all monitor work bad. Now my monitor is fine! Before the fix, the monitor are very mad! Random distortion...

Hi! Any news with your tests? This days I tried to fix my Colorsync 1710/750 with a very similar issue. The problem is the logic board on the neck, more in deep is the colorsync part… if you replace the 93c66 eprom with a new blank one, the colorsync go on disable state and the monitor work good...