Be sure your remote hasn't got a button stuck down which is changing channels. If not, take the batteries out of the remote. If this stops the channel changing there is probably some conductve material stuck across the circuit board
inside the remote. If this is the case you have to check inside the remote by openning it up.
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Assuming your TV continuously changes channels on its own in the upward direction, I had the same problem with my GE 31GT740 TV and fixed myself. GE will give you the runaround and have you calling RCA who has no clue. The cure is simple but, you need someone to help you move the set around. Remove the rear cover by taking out all of the screws – obviously unplug the set first. Then remove the large circuit board by taking the two screws out from the underside. The TV will need to be laid down on the screen side so have a large pillow or blanket laid out. The main circuit board has two side stops that hold it in and then pry it a little. The entire board slides out and you can set it aside. Now, remove the front switch panel assy by depressing the two side stops. Then the circuit board behind the switches can now be removed from the assy. The third button in from the center is the ‘up channel button’. Pry off the small switch soldered to the board behind the ‘up channel button’. Reassemble and the problem will be fixed. In other words, the ‘up channel’ button on the TV set has gone bad.
Keeps changing channel
Check voltage on D12 if below 4.8V then change
Changes channel or volume adjusts by itself
Check S900/1/2 on pcb H1, alternatively this could be due to failure of IC005 (CD4052BCM-FL63) on pcb A
Had the same problem, channels would not stop scrolling.
It was as though someone had there finger on the channel up button.
Disconnected the sixth wire, starting with the black wire on the wiring harness for the front buttons, on/off, ch. up/down, vol. up/down, etc.
It works fine, no more unwanted channel surfing!!