Hard Reset or Factory Reset from Service Menu 

TH-32MS670DX,TH-32MS680DX, TH-32MS660DX, TH-43MS670DX, TH-43MS680DX, TH-43MX700DX, TH-43MX660DX, TH-43MX710DX, TH-55MX700DX, TH-55MX710DX, TH-65MX700DX, TH-43MX750DX, TH-43JX750DX,TH-43LX750DX, TH-55JX750DX, TH-55JX850DX, TH-55MX850DX. TH-65MX850DX, TH-65LX850DX, TH-43MX740DX, TH-55LZ950DX, TH-65LZ950DX, TH-55LX850DX