R50e VGA-out - color problem

[j00j4nt200]

Hi,
I got second hand r50e.
When I connect vga out to monitor I'm getting wrong colors:
correct on LCD -> Wrong on vga out- monitor
white -> yellow
light blue -> light green
ligth green -> light blue
red ok -> red ok
I tried on 2 monitors, and it's same.

Did anybody have simular problem? Can you guess is it vga connector contact problem or cold soldering or gpu problem or something else?