VGA uses one pin for each color and if a pin is bent or broken a complaint like yours can happen.
I'd look at the cable ends for bent broken or missing pins. Sometimes I find a pin I can straighten but with consumers that are getting picky I just put in a new VGA cable.
Hi Dear Members,
I am facing a issue, yesterday i was trying to disconnect the vga cable from my Samsung LCD Model LA40D550K7RXZN, when i unplugged it suddenly colours changed and blue colour increased, i try to rest, check all colour setting, even i opened the back cover and checked for any lose cable, i unplugged the lcd panel cable from mainboard clean it and plugged again but no change, i turned office my tv for hours but the problem is same, CAN ANYBODY HELP ME...

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