Acer PD525 PD525 Service Guide - Page 53

G. Have Line Bar? - Adjust the frequency selection in OSD Menu. - Press the Menu button to check that have Line bar show on the OSD Menu. (Check the DMD chip and DMD board. If the Line bar also show on the OSD Menu) - Ensure that there is no dust on the DMD Contact housing module. - Re-assembly for DMD module. - Check the Main board. H. Have Noise? - Ensure the Signal cable and Source is work as well. - Adjust the Tracking selection in OSD Menu. - Press the Menu button to check that have the noise issue appear on OSD Menu. (Check the DMD board if the noise also appear on the OSD Menu.) *Note : The procedure to enter service mode is.. Press "Power", "Left", "Left", "Menu" button when the Unit under search status. Performance Troubleshooting (Video Signal) A. Have Image? - Ensure the signal cable and source work as well. - Check that can OSD menu show on the screen. (Check the main board if OSD menu cannot show on the screen) B. Have Garbage Pattern? - Ensure the signal cable and source work as well. - Check that can OSD menu show on the screen. (Check the main board if OSD cannot show on the screen) Chapter 4 48