Read&Write Line Connection------LG 32 to 52 inch HD screen TCON board’s screen line port with 51 pins,the fourth pin is SDA,the fifth pin is SCL,with a line GND more,remould a ISP upgrading line with the screen lines;and connect it with the 12C expansion port on locking socket of RT809F,then can read and write on line using the screen lines port. Before reading and writing please charge the screen with the 12V power.