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Looks like switching IC problem. If you know repairing methods try locating the IC. search by the part No. of IC in Google. example- TC 4066 is a switching IC in some TV models. Look similar type in your TV.
the problem for your unit is the manual button switches. In the long time it wasnt used. it got stucked and somewhat rusted. This problem can best be addressed by replacing the buttons switches(tac switch).
this should solve your problem.
if you have a soldering iron you can try to desolder the program+ and program- tac switches switch on the tv again and see if it still scrolls if it doesnt scroll through the channels it means that one of the switches is faulty your remote should work once you desoldered the tac switches replace the tac switch
The only thing I know of that can do what you are seeing is if something has spilled into the set and has contaminated the pushbuttons under the volume/channel buttons. If the Channel Up pushbutton has fluid in and around it then it can conduct and the microprocessor thinks you are telling it to go up through the channels. The only way to fix that would be to disassemble the set and pull out the PC board which has the pushbuttons on it and clean or replace them. If you do not have experience working inside TV's then allow a qualified tech to handle it for you.