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The magic focus will stop if there is a bad sensor and or a problem in the convergence circuit.
This set uses two STK-392-110 convergence chips--both along with any of the resistors that protect them need to be replaced and the set adjusted--I have repaired hundreds of these sets----
model number----and if you go into the customer menu and either red or
blue will not move in any or some direction--the chips have to be
replaced---LET ME KNOW WHAT YOU FIND AND I CAN GIVE YOU FAIRLY DETAILED
INSTRUCTIONS ON WHERE TO GET THE PARTS AND WHAT IS INVOLVED IN THIS
You may need to replace your Tvs convergence board. Go to
www.partstore.com and type in your Tv model #. It is a simple swap
procedure with no soldering. It costs about $80 or more. It takes 30 to
45 minutes to replace.