Basic Power Supply block Diagram (AC - DC convertion The Power Supply block Diagram. In order to achieve a direct current voltage source, the alternating current input must follow a convertion process like the one shown in the chart below. The chart shows the operation of a voltage power supply using a block diagram. It also shows the waveforms at the beginning (AC input),.. TV Service Repair Manuals - Schematics and Diagrams When troubleshooting your TV you will need to use schematics and diagrams to find the problem. Flat panel TV Diagram of Internal Parts and Circuit Boards Note: If your TV has power issues, consider replacing the POWER SUPPLY BOARD. If your TV has Lines across the screen and the screen is not cracked, consider replacing the T-Con Board.