Samsung LU28E570DS/ZA User Manual - Page 36

Chapter 09 Troubleshooting Guide Requirements Before Contacting Samsung Customer Service Center ――Before calling Samsung Customer Service Center, test your product as follows. If the problem persists, contact Samsung Customer Service Center. Testing the Product Check if your product is operating normally by using the product test function. If the screen is turned off and the power indicator blinks even though the product is properly connected to a PC, perform a self-diagnosis test. 1 Power off both the PC and product. 2 Disconnect the cables from the product. 3 Power on the product. 4 If the message Check Signal Cable appears, the product is working normally. ――If the screen remains blank, check the PC system, video controller and cable. Checking the Resolution and Frequency For a mode that exceeds the supported resolution(refer to Standard Signal Mode Table), the message Not Optimum Mode will appear for a short time. ――The displayed resolution may vary, depending on the computer system settings and cables. Check the following. Installation issue (PC mode) The screen keeps switching on and off. Check the cable connection between the product and PC, and ensure the connectors are locked. Screen issue The power LED is off. The screen will not switch on. Check that the power cable is connected properly. The message Check Signal Cable appears. Check that the cable is properly connected to the product. Check that the device connected to the product is powered on. Not Optimum Mode is displayed. This message appears when the signal from the graphics card exceeds the maximum resolution or frequency for the product. Change the maximum resolution and frequency to suit the product performance, referring to Standard Signal Mode Table (P.40). The images on the screen look distorted. Check the cable connection to the product. 36