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Re: out of focus
How old is the set? If picture is really very blurry, Try adjusting 'focus'. You can find this conttrol generally at the rear of the set.
Otherwise,. if you know solid state electronics, Check the Focus control on the FBT. It is also possible that the CTR Base is faulty. Replacing this helps.
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This kind of symptoms can be correct by the focus adjustment at the flyback transformer. FBT mostly has two control knob (Focus and Screen), focus is usually at the top one like in the sample picture below.
Open the back cover of your unit and then locate the FBT. Power on the unit and try to adjust the focus knob.
If the symptoms can't be cured by the this step, this is an indication that the CRT socket is already faulty. You have to replaced this parts and then make some adjustment at the focus knob of the FBT and your unit will back to normal again.
CRT(picture tube) socket
Hope I helped you.
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Fuzzy is a funny word. I never use it to describe a picture problem. That because fuzzy can go too many different ways. There is snowy fuzzy, blurry fuzzy, grainy fuzzy, and demodulated fuzzy. If the set goes out of focus intermittently that has something to do with the focus ciruitry. If it goes grainy that is a front end problem, usually tuner related. The other types of fuzzy are generally associated with problems in video processing some where. So, which is it?
Oh, and BTW that unit has three small picture tubes in it, one red, one blue, and one green. It doesn't have a 'bulb'.
there are 3 things that will make your tv go blurry, the focus and screen control assembly , the high voltage splitter and the horizotal transformer and that is only if all three tubes are blurry.if only one tube is blurry, more than likely the tube itself is bad.
behind the front grill is a door with 4 t20 torque screws in it, remove that & to the left will be a screen/focus block, three knobs will be for tube intensity STAY AWAY FOM THOSE. the other three will be your focus for each tube