Samsung 400UX-2 Service Manual

Also see for SyncMaster 400UX-2: User manual Quick start guide Specifications Quick start guide Quick start guide

4-44. Troubleshooting4-3. No PC(D-SUB) VideoSymptom Though the LED power turns on, the screen is blank when connecting the VGA cable.-MajorcheckpointsCheck the D-sub cable connections.Check whether the LVDS cable is connected correctly to the panel.Check whether the lamp connector of the panel is connected correctly to the SMPS board.---DiagnosticsIC304CN101FT604 FT609YESCheck the power port.NoDoes the LED light up when turn onthe power?Does 5V appear at Pin 10 of CN101D-Sub? Check the cable connection.NoYESDoes the waveform as the figure at Pin6 ( H-sync) 4 and Pin 8 (V-sync) 5 ofIC304 appear?The Scaler(IC304) isabnormal.NoYESIs TX** signal sent to Pin 3, 4 ofFT604, FT609?The Scaler(IC303) isabnormal. Replace the mainboardNoYESCheck the cable between the mainboard and panel and replace the LCDpanel.Caution Make sure to disconnect the power before working on the SMPS board.