Thanks for your input sceadwian. I see what you;re saying but, from my experience, bad parts have a 30:70% ratio of "carry-over" of damage. Kinda
like a naughty virus infection. So i have to be 99.99% in isolation when i test
PC components. I heard of a device that does do the output test, its called a
"status indicator box". Just a plastic box with LEDS and a vga cable, and maybe some simple circuitry inside. A company is charging $120 bucks for each unit plus shipping ! From my experience, these custom devices usually
dont carry any major circuits and they make a killing for each unit.
I figure all signals have a "paired" line. So a good VGA must have all signals
outputted, hence a "custom" green LED on the unit would light up. For bad VGA output one, or more, or ALL pairs would NOT be outputting any signals. So my theory is that a simple row of LEDs can be used to diagnose for a simple normal VGA output.
Thanks again !