This problems very common on Sharp Tv.Do ur tv LED power light turn on solid first.Few mins,than LED,OPC flahes.Power LED,OPC flashes,push power button again,do this at leat 5 or 6 times somtimes the backlight will come back on and work.The power LED,OPC light flashes,turn off/on more than 5 or 6 times don't work.Ur Tuner signal board is dead,must replaced.
SOURCE: impossible to change channels, turn TV on, Power and Opc blinking
go into programming mode and search for channels it will do this automatically to find all antennae and all cable channels if this is hooked up to a receiver box then only channel 3 will be found or used also most tvs are computerized these days and at times it will need to 'rebooted' unplug the power and wait 10 seconds and plug it in again this may have to be done whenever you are locked out from changing channels or using the volume controls
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