Repair method for TV circuit board 1. Dust factor;   This TV has been in use for a long time. If it cannot be cleaned with dust, there is too much dust inside the radiator, the circuit board is too dirty, and the heat dissipation silicone grease is faulty. Due to the fact that the output module of the color circuit board inverter (PM100CSM120) is an integrated module, even if the entire circuit is damaged, it needs to be replaced, resulting in high maintenance costs and difficulty in finding a good module. If the converter is not damaged, it needs to be maintained more carefully, especially in hot summer, paying attention to ventilation and air dispersion. After the TV vibrates violently, more situations will occur, and it is still uncertain whether the damage to the parts is caused by human factors.     This 21 inch  The circuit board of the old TV should be repaired by professional maintenance personnel. If the picture can be displayed, everything is fine except for the halo on the screen. If there is such a problem, it is necessary to find someone to repair it.