Older 90's projection screen. 52 inch
Try opening up the front cover under the speaker outer cover, most speaker fronts should just pull off if you don't see any screws holding it secure near the side close to the front cover. Then there is about 4 or 5 screws that hold the front inner cover on. You are looking for a small black box with 6 adjusting screws . Three of these are for adjusting the focus and three are for adjusting the amount of current going to the CRT's. The markings are very small but you can try turning the Blue screw down and that will decrease the blue ( marked with a B). But if this just makes the other colors seem more powerful you may have a bad blue CRT. There is adjustments for three color CRT's ,Blue , Green and Red, try playing with the Blue and try to get it the way you think it should look but if the Blue just does not want to work right the Blue crt is probably gone.
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