Hello my tv is about 5-6 years old and problem is when i switch tv on its alright for about 2-3 hours then switch off but sound on then when i switch back on its alright for about 30 min, then the same switch off and on, and then he off after 5min then after 1min then 15s but if i keep him off for a while is working longer for me its looks something overheats but im not sure i think to buy new power board but not sure its power board maybe someone has same issue on this tv or similar toshiba tv thanks