The problem, lies on the flyback ,, on the flyback there two adjustment, the screen and focus that was writtten , adjust only the screen slowly untill screen of your tv back to normal.....fading because over saturation of voltage, adjust the screen trimmer counterclocwise....
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You can take off the back of the tv. Look for the red wire at the top of the tube. Follow it down to the part that it goes into. On that part (transformer) there are 2 controlls. The one marked SCREEN, is the one you can turn up and watch the screen at the same time. If the tv shuts off, put that control back to the original position. If it brings up the brightness, then it is fixed. If not, take to a repair shop.
If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.
I likely you have a loose conection in the crt board at the neck of the picture tube or a loose conection close to the high voltage transformer,I would suggest to tap the main board as well as the crt board with a wooden or rubber handle(not metal),be attentive were you tap to see if the set reacts ,if the set reacts you will need to resolder those places ,be carefull working on a set that is on while you do it,this should give some idea what the problem could be in case you want to call someone to help you with the repair.Let Us know if you need more information.
The dark picture is a bad capacitor for the screen or drive voltage for the picture tube driver transistors. The other problem of streaking is one of the same. Thats the indication that a capacitors defective . It could in a rare cas ebe a defective or gassy crt as well but 99% of the time when a crt is said to be gassy its nothing more then poor drive to the crt. Good luck