This section filters out electromagnetic interference (EMI) from the AC line and protects the TV from voltage surges. The diode bridge rectifies the 220V/110V AC into a pulsating DC voltage, which is then smoothed by the large electrolytic reservoir capacitor (typically rated at 450V).
Before probing a live board, Use a discharge resistor to safely drain this capacitor before soldering.
Form the Electromagnetic Interference (EMI) filter network. 2. Primary Rectification and Filtering The AC voltage is converted to a raw DC voltage.