Display screen interface signal conversion circuit, device and method

The invention discloses a display screen interface signal conversion circuit, device and method, and the circuit is connected with a television mainboard and a screen drive board (TCON), and comprisesan EPI module, a V-by-one module and a control module, which are connected in sequence. When the television is debugged or maintained; the television main board sends eight groups of V-by-one differential signals to the EPI module; the EPI module is used for transmitting the eight groups of V-by-one differential signals and the control module is used for transmitting a power supply and a controlsignal to the V-by-one module and rearranging the power supply and the control signal to form a V-by-one standard signal; and the V-by-one module transmits the V-by-one standard signal to the screen driving board (TCON), and a V-by-one screen is driven by the screen driving board to display the V-by-one standard signal so as to confirm whether the television mainboard is normal or not. By arranging the display screen inter