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Its magnetic effect on picture tube. Power Off TV for 20-30 minutes then turn it On, hope problem will be resolved. Please also check and remove any speaker or some thing have magnet near by TV. If color spots are still there, picture tube need to degaussed / demagnetized.
if you have chirping sound .. check your horizontal out transistor that may be one cause there are seven or nine green lights around power supply see if all came on if not call me 520-248-4242 or leave message
Convergence IC's must be changed to start repair..original...
STK392-110 sub to Hitachi upgrade STK394-160E.....PART #
CZ 01341...you need two....
Next, take a critical look at the B+ feed resistors near the IC's..
check for over-heat / damage......usually 2.2 ohm 2 watt......
Let me know....................T.
Do you have a cable box which turns on and off with the tv? If so is your cable box input on the video 4 mode? If that is the case look under the video menu for advanced selections, you will see a selection for auto/on/off for video 4, select off. Check manul under video and it will explain also.