We cannot get sound on the following channels 9, 10, 19, 24, 26, 37, 46, 48, 51, 52 56, 72. We will get sound for about 1/2 a second and then it is mute. Bought the TV about a year ago at Sams.?

Televison & Video - Protron - PLTV-4250 42 in. LCD Television