I am currently trying to diagnose a VGA problem on hardware A. Hardware A has some trouble sending display to certain projectors (while it is able to send display on most LCD monitors).
Hardware B connects successfully on both projectors and monitors (Nvidia quadro 2000).
The question here is : could there be a link with the spikes I see on both horizontal and vertical sync pulses of Hardware A and the fact that Hardware A has more problems with certain projectors ? Hardware B seems to have a much clearer signal.
Also, does Horizontal and vertical sync pulse need to align (at both beginning and end of a vertical sync pulse). I see here that Hardware B aligns perfectly, but Hardware A shows a 800 nsec delay.
Vertical sync pulse and horizontal sync pulse - Hardware A
Vertical sync pulse and horizontal sync pulse - Hardware B