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I have just got a kv-20s43 and your best bet is to try to restore settings, here, To reset TV to factory settings, turn the TV on, Then, while pressing the reset button on the remote control, press POWER on the TV. The TV will turn itself off, then back on, the original settings wiill be restored... definition: ch. fix- 2-6: Select when you want to control all channel selection through a cable box. Select the appropriate channel(usually 3 or 4) and use the cable box's remote control for channel selection. VIDEO: select from available inputs when you have connected video equipment and you want your TV fixed to it.
Controlling the TV power and volume is probably all you'll be able to do with that control. The Comcast remotes are meant to be used with their converter boxes, and normally people want to change channels on the box while the TV stays on the box output channel (usually 3, sometimes 4). The remote's channel up and down buttons and number keypad only send out the codes recognized by the converter box. You'll need to fall back to the TV remote if you want to control more than power and volume.
Defective tactil switch?? Remove tact switch control board.
unplug connector,use meter--check each switch.
If no problem found,leave unplugged overnight or longer.
Sony is famous for getting brain freeze!.........T.