4 Troubleshooting4-54-3 No DVI VideoDoes the LED light up whenturn on the power? Check the power port.YESNODoes 5 V appear at Pin 14 and16 of CN101 DVI port? Check the cable connection.NODoes the wave form as the figureappear at R161(DVI_SCL)and R162(DVI_SDA) ?Replace the main board.NODoes the signal appear atRA107(R), RA102(G), andRA105(B)?IC105 is abnormal. Replace themain board.NOCheck the cable between themain board and paneland replace the LCD panel.YESYESDoes the TX** signal appear atPin 14 and 15 of CN403?The Scaler (IC408) is abnormal.Replace the main board.NOYESYES78
