Blacl 21 inches Pnasonic TV 4 System CATV Hyper-Band- The Botton for system configuration of finding the channel is not working, Even if i use the remote control the menu function for tunning the channel, color and brightnest is not working only the sound and change of channel is working, cannot fine tunned the each channel pls kindly tell the what is the broblem of my TV and how can i resolved this problem
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