screen is just white?

Unless you want to be replacing capacitors and soldering bits and whatnot, I'd just sling it mate.
If it's old and you've had a good run out of it, just buy a new monitor.
My trusty 245b died recently and it was a very sad day.

I'm assuming you've tried different cables, different pc's, different ports, standing on your head and so on?
 
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