Hello
Its picture tube base socket has damaged. Picture tube base socket is one diretly soldered to the base card, which in turn pluged onto the picture tube neck. Its focus control pin will usually get damaged, and this type of fault you describes here will occur. The time taken to clear up picture will vary according to atmosphereic humidty.
You can replace the base card. Unplug the base card from the picture tube base card [do it ver cauciously; not to shake it sideways or up-down - just pull it straight backwards; you may have to apply a little pressure to detach it from the picture tube neck]; resolder it out from the card and go for a new one. Replacing it will solve your TVs problem. OK.
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