V-chip reset. Hi ! I got y tv set at a garage sale and i connected it to a direct tv receiver,

Question

Hi ! I got y tv set at a garage sale and i connected it to a direct tv receiver, there are several channels in which this TV is requiring me the V-chip four digit number, i tried the default ones but do not work. I do not have the owner's manual and on the back of the TV the manuf name only says: Flat-Television and the model is FTV21P. I haven't even been able to locate information about my TV set in order to reset the v-chip. CAn you help ??