I had problems the first couple of years with the picture outsizing the screen. A Sears repairman came in and swapped out a board saying it at to do with the the pins. Is there parts still out there to fix or am I S.O.L.
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This is the best solution for your problem as a 40 year experience with wires etc.
Go to the source of your cable signal connector .
Open it and clean the terminals with emery paper , sand the end of the cable shiny clean from corrosion , get a new barrel connectors with gold terminals if possible lengthen the ends of the cable , insert and tighten good, use thick rg-16 or rg 40 cable with good insulation ends crimped professionally with a crimpier or buy ready made , not from dollar store. Get a gold plated professional splitter if you need one or two , it will cost about 15 or more each . Make the cable runs as short as possible, using the thick good cables. If needed get a signal magnifier. From radio shack or the source etc. Connect them good and tight . Ground the splitters . Problem solved , you will get crystal clear channel 2 to 7 including 3 and 4 . Isolate the TV cable from other cables and power wires.
Usually a loss of picture problem on this set is caused by parts on the circuit board failing. Most often a repairman will find the problem around regulator in power supply or around main output transistor in horizontal circuit. Either way, solder work and test equip. are required.
I had this problem and did not have the time to fix it myself so I called Sears. The "tech" looked at his laptop, called his "supervisor" a couple of times and told my wife that both control boards needed replaced at a cost of over $500. The manuals, with testing procedures for the inclined, are on the inside, front cover.
The CE error is a communications failure and on mine it required replacement of the AVS board. I bought the part at a local supply house and replaced it myself for about $175.