Toshiba CT-90043

[Combwork]

I've just bought one for £25 including delivery. CRT 31" screen so I guess it's neither new or old. Very heavy with a good sharp picture. In general the color's good but large areas of black show up as murky red. There are red, green, yellow and blue buttons on the remote but they don't seem to have any effect. Would the buttons only alter NTSC? I'm in Scotland ; the system here is PAL. I don't have a manual (yet).

As long as it's not to use it as a boat anchor, any advice would be most welcome Maybe I should get the back off and try to find if a lead's come loose or if there are any color controls but I really don't want to damage it or kill myself