Question about Sun X7136 21" CRT Monitor

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Gdm5410 (sun monitor) colour problem

Hi, I recently picked up a pair of old sun monitors, the GDM5410's, manufactured by sony. One of them works perfectly, but the on the other, the picture is tinted blue. I can mess with the gain and bias osd settings, but if I turn either of the blue options down, the colours just start looking horribly distorted, white and black just look off no matter how I set it up.
One thing I have noticed is that the osd menu appears properly coloured, the white looks bright and clear, unlike whatever's being shown on the screen. This makes me think it might be a dodgy connection somewhere. The external vga connection pins appear undamaged, so I'm just wondering what I should be looking for if I have a bit of a poke around inside the monitor itself. Also, if anyone could point me to an online manual for it, that'd be helpful.
Cheers, Elliot.

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