For about a year my Zenith 52" Large screen TV has had a
blurry screen. When its first turned on the screen goes from
clear to progressively blurry. The last 2 months it starts
out blurry, after about 30 minutes it goes clear. It usually
stays clear for 30-45 minutes then gradually gets so blurry
it is not even watchable. If its left off a couple of days
or for several hours, it will stay clear longer. Can anyone
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Re: Screen goes from blurry to clear to blurry
The first thing to check is for loose conections,the problem is related to the high voltage but it can start in the main board with one component loose,when the high voltage is developed it goes to what is call the distributor block,a lot of sets have the focus and screen controls coming out of this block for each picture tube,this block might be bad but before we go to him we need to check everything is solid in the main board.If you are familiar with electronics you can remove the back cover and tap the chassis with a wooden or rubber handle to see if the set reacts,if it does you need to be atentive what area makes it react and flip the board to do some resoldering,If you are not too familiar with tv service you need the assistance from a servicer.Let Us know how it goes or if you need more information.
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Most likely a contact problem or broken track on one of the flexi circuits coming off the LCD screen - Repair shop would recommend a new screen. Some people have bodged repairs by putting pressure (layers if tape) on offending flexi circuit - see AVS forums - but this is definitely not recommended and if you are not skilled then working in the back of a TV can be lethal. My advice always buy LCD TVs with a 5 year warranty (Richer Sounds, JLP or similar).
It sounds like you TV is overheating and the video is suffering and the lamp is overheating as well. Also, if your TV is over 2-3 years old, the mirrors (behind and below the big front screen) desperately need to be cleaned. Clean all filters and fans as well. (Look on side and behind the unit). Is the TV in a "hot" environment and/or dirty environment? DLP TV's are NOT sealed units. They need to be cleaned every few years to work well to have a good, clear, bright picture.
CRT tv's have a FOCUS adjustment on the flyback transformer. There may also be a "screen" adjustment on it, but you DO NOT want to turn that one.
You would have to open the tv, and take an INSULATED TOOL and turn the little adjustment labeled FOCUS or F on the flyback transformer, which is the large (usually black) thing that makes the high voltage for the CRT. It can easily be found by tracing the large red wire that has a suction cup at the top of the tube in the back. This wire goes to the top of the flyback. the focus is usually on the side of the flyback.
You must be very careful when doing this. Use a mirror to see the front of the screen while adjusting, don't reach around! Since this is the part of the TV that has LETHAL voltages you must be VERY careful not to touch anything else, since this must be done with te set turned on and warmed up.