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Back to Contents Page Diagnostics Dell™ Vostro™ 1520 Service Manual Device Status Lights LED Error Codes Power Button Light Codes Device Status Lights If your computer is connected to an electrical outlet, the light operates as follows: l Solid blue—The battery is charging. l Flashing blue—The battery is almost fully charged. If your computer is running on a battery, the light operates as follows: l Off—The battery is adequately charged, or the computer is turned off. l Flashing orange—The battery charge is low. l Solid orange—The battery charge is critically low. LED Error Codes If your computer does not perform a Power-On Self-Test upon boot up, there are various things to look for: 1. Check that the computer power light is on. 2. If the power light is not on, ensure that your computer is plugged into AC power. Remove the battery. 3. If your computer is powered on but is not performing a POST, check to see whether or not the keyboard status lights flash to indicate a successful POST but no video or if the keyboard status lights are lit in a sequence indicating a system problem. The following table shows the possible LED codes that may display in a no-POST situation. Device status lights located in the center of the hinge cover. 1—Turns on when your computer reads or writes data to the hard drive. NOTE: To avoid loss of data, never turn off your computer while the Hard Drive light is flashing. 2—Turns on when wireless networking is enabled. 3—Turns on when a card with Bluetooth® wireless technology is enabled. NOTE: The card with Bluetooth wireless technology is an optional feature, so the light turns on only if you ordered the card with your computer. For more information, see the documentation that came with your card. To turn off only the Bluetooth wireless technology functionality, right-click the icon in the system tray and click Disable Bluetooth Radio. 4—Turns on when the numeric keypad is enabled. 5—Turns on when the uppercase letter function is enabled. 6—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. FLASH-ON-FLASH LCD Panel Error 1. Reseat the LCD cable. 2. Replace the LCD panel. 3. Replace the video card / system board. OFF-FLASH-OFF 1. Install compatible memory modules. Power Button Light Codes The power LED located in the power button on the front of the computer illuminates and blinks or remains solid to indicate five different states: l No light—System is in the off state (S5, or mechanical (AC power not applied) OFF). l Solid Amber—System fault, but power supply is good—normal operating state (S0). l Blinking Amber—System fault error condition including Power Supply (only +5VSB working), Vreg failure, missing or bad CPU. l Blinking Green—System is in power saving states S1, S3 or S4. (Blink rate is 1Hz). No fault/error condition. l Solid Green—System is fully functional and is in S0 (ON) state. Memory compatibility error 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 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. OFF-FLASH-FLASH Modem Error 1. Reseat the modem. 2. Replace the modem. 3. Replace the system board. FLASH-FLASH-FLASH System board error 1. Replace the system board. FLASH-FLASH-OFF Option ROM Error 1. Reseat the device. 2. Replace the device. 3. Replace the system board. OFF-ON-OFF Storage device error 1. Reseat the hard drive and optical drive. 2. Test the computer with just the hard drive and just the optical drive. 3. Replace the device that is causing the failure. 4. Replace the system board. FLASH-FLASH-ON Video card error 1. Replace the system board. Back to Contents Page Adding and Replacing Parts Dell™ Vostro™ 1520 Service Manual Battery Hard Drive Wireless Local Area Network (WLAN) Card Optical Drive Processor and Memory Access Panel Heat Sink and Processork Display Assembly Camera LCD Display Panel Keyboard USB/IEEE 1394 Board Speaker Assembly Coin-Cell Battery Hard Drive and Mini-Card Access Panel Wireless Wide Area Network (WWAN) Card Internal Card With Bluetooth® Wireless Technology Fan Memory Hinge Cover Display Bezel Display Assembly Hinges Display Inverter Palm Rest Fingerprint Reader System Board Back to Contents Page Specifications Dell™ Vostro™ 1520 Service Manual Processor System Information ExpressCard™ 8-in-1 Me...