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For additional safety best practices information, see the Regulatory Compliance Homepage at NOTE: You may need to install Adobe™ Flash Player™ from Adobe.com in order to view the illustrations below. Back to Contents Page DC-In Port Dell Precision™ Mobile Workstation M4500 Service Manual Removing the DC-In Port 1. Follow the procedures in Before Working Inside Your Computer. 2. Remove the battery. 3. Remove the access panel. 4. Remove the subscriber identity module (SIM) card. 5. Remove the optical drive. 6. Remove the keyboard. 7. Remove the coin-cell battery. 8. Remove the hinge covers. 9. Remove the display assembly. 10. Remove the hard drive. 11. Remove the Latitude ON™ Flash card. 12. Remove the wireless wide area network (WWAN) card. 13. Remove the wireless local area network (WLAN) card. 14. Remove the heat sink and fan assembly. 15. Remove the processor. 16. Remove the palm rest assembly. 17. Remove the Bluetooth® card. 18. Remove the ExpressCard board. 19. Remove the SD card board. 20. Remove the system board. 21. Remove the I/O port card. 22. Release the DC-in port from its routing guides on the chassis. 23. Lift the DC-In port up and remove it from the chassis. Replacing the DC-In Port To replace the DC-In port, perform the above steps in reverse order. Back to Contents Page WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at NOTE: You may need to install Adobe™ Flash Player™ from Adobe.com in order to view the illustrations below. Back to Contents Page Diagnostics Dell Precision™ Mobile Workstation M4500 Service Manual Device Status Lights Battery Status Lights Battery Charge and Health Keyboard Status Lights LED Error Codes Device Status Lights Battery Status Lights If the computer is connected to an electrical outlet, the battery light operates as follows: l Alternately blinking amber light and blue light — An unauthenticated or unsupported, non-Dell AC adapter is attached to your laptop. l Alternately blinking amber light with steady blue light — Temporary battery failure with AC adapter present. l Constantly blinking amber light — Fatal battery failure with AC adapter present. l Light off — Battery in full charge mode with AC adapter present. l Blue light on — Battery in charge mode with AC adapter present. Battery Charge and Health To check the battery charge, press and release the status button on the battery charge gauge to illuminate the charge-level lights. Each light represents approximately 20 percent of the total battery charge. For example, if four lights are on, the battery has 80 percent of its charge remaining. If no lights appear, the battery has no charge. To check battery health using the charge gauge, press and hold the status button on the battery charge gauge for at least 3 seconds. If no lights appear, the battery is in good condition and more than 80 percent of its original charge capacity remains. Each light represents incremental degradation. If five lights appear, less than 60 percent of the charge capacity remains, and you should consider replacing the battery. Keyboard Status Lights The green lights located above the keyboard indicate the following: LED Error Codes The following table shows the possible LED codes that may display in a no-POST situation. Turns on when you turn on the computer and blinks when the computer is in a power management mode. Turns on when the computer reads or writes data. Turns on steadily or blinks to indicate battery charge status. Turns on when wireless networking is enabled. Turns on when a card with Bluetooth® wireless technology is enabled. To turn off only the Bluetooth wireless technology function, right-click the icon in the system tray and select Disable Bluetooth Radio. Turns on when the numeric keypad is enabled. Turns on when the Caps Lock function is enabled. Turns on when the Scroll Lock function is enabled. Appearance Description Next Step ON-FLASH-FLASH No SODIMMs are installed 1. Install supported memory modules. 2. If memory is already present, reseat the module(s) one at time in each slot. 3. Try known good memory from another computer or replace the memory. 4. Replace the system board. FLASH-ON-ON System board error 1. Reseat the processor. 2. Replace the system board. 3. Replace the processor. Back to Contents Page FLASH-ON-FLASH Display panel error 1. Reseat the display cable. 2. Replace the display panel. 3. Replace the video card/system board. OFF-FLASH-OFF Memory compatibility error 1. Install compatible memory modules. 2. If two modules are installed remove one and test. Try the other module in the same slot and test. Test the other slot with both modules. 3. Replace the memory. 4. Replace the system board. ON-FLASH-ON Memory is detected but has errors 1. Reseat the memory. 2. If two modules are ins...