The picture tube could be getting old. Normally this effect can also be due to alignment with the magnetic meridian. You can try to de-gaussing with a high voltage gun. http://www.repairfaq.org/sam/crtfaq.htm see section CRT Age Resulting in Dark Picture
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The picture tube could be getting old.
Normally this effect can also be due to alignment with the magnetic meridian.
You can try to de-gaussing with a high voltage gun.
http://www.repairfaq.org/sam/crtfaq.htm
see section CRT Age Resulting in Dark Picture