I have a 40 or 42 inch flat power comes on but no

SOURCE: I have 52 inch flat screen samsung, my tv shut off

YOU HAVE A MODEL THAT HAS A FACTORY DEFECTED POWER SUPPLY.I HAD SAME ISSUE BUT KEPT DIGGING AND CAME UP WITH THE SAMSUNG CUSTOMER SERVICE @1800SAMSUNG GAVE MY SERIAL NUMBER AND MODEL AND FOUND OUT THERE WAS FACTORY DEFECT THAT THEY WILL SEND OUT A TECH TO REPAIR FREE OF CHARGE.THE STORE I BOUGHT IT FROM DID NOT HOWEVER HAVE THAT INFORMATION UNTIL I GAVE IT TO THEM ......WINK WINK

SOURCE: rca flat screen; 32 inch; model # L32WD22; green power light comes on but no picture or sound

i think its from the cables try to put them correctly ... i think u putted them not in the good place