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ProScan CRT early 90s. Few weeks ago, the tv started to display a 0.5in tall horizontal picture. Just turn it on and off a few times usually fixed it. Now it is stuck displaying in this horizontal band. Full picture is there- it's displayed 1/2inch vertically but horizontally goes all the way across the screen. Any help would be appreciated.
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Yes it can be fixed. Everything you are saying points to a problem with the digital video processing module and or associated power supplies that run it. Even though this is a "digital HDTV". It still makes it's picture using older analog methods (electron beam scanning on a CRT projects the image). Sometimes the digital video IC's would simply need to be resoldered. The big question is although it is repairable, is it cost effective. This is a 51" CRT projector. There are 50" flat panel tv's available now that can outperform it for $500-600 brand new. Back in the late 90s and early 2000s when I used to repair these full time, the repair would cost you around $350 including service charge to come to your house. Back then this tv cost around $1500+ so it was usually worth repairing, but that is not the case today. That is the rule, but There are a few exceptions (ie the guy who cuts a giant hole in his wall to recess the tv inside his wall for a "custom" installed look is forced to choose between repairing a 15yr old tv (your tv dates back around 2002 if memory is correct) and heavy construction)
Check all the solder terminal at its main power regulator section circuit. Any loose solder terminal can poise this type of problem. Resolder all the suspected solder terminals by applying a little more solder. If you wish to get more details, check this site.
There are no tubes; generally the pop happens because of high voltage. It is being shorted out and the pop is either the flyback transformer or the horizontal transistor oscillator. these two are reponsible for creating the high voltage cycle for your television; when either of them or their circuitry is shorted out you hear that "pop" which is the emergency cut off circuitry coming into play to protect the rest of the television.
Unfortunately there isn't any way to repair your tv as the magnet has distorted the tube that is in the tv and with CRT becoming obsolete the repair is likely to be very costly so probably your chaepest option is to buy a new tv .
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