Electro static discharge ang minsan fault since most tv today use sensitive iC which are very sensitive to elec surges unlike solid state devices na mataas ang tolerance against ESD or ES kaya advisable talaga na may proper grounding ang lahat ng devices.avr are not 100 % effective as everyone might think.from time to time nagkakaroon din ng spike yang mga yan.my advice if using an antenna install a ground rod or a lightning arrester.disconnect the aerial antenna from your tv kapag may thunderstorm kasi kahit nakapatay unit mo prone parin na madamage.