Check and replace its CRT base socket fitted at its CRT base card. It is faulty. Its 'Focus' pin contact is loose. Not repairable; only replacement to this socket can be done. The socket can be purchased from any electronic spare part selling shops.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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