Dell Latitude 5401 Service Manual

Also see for Latitude 5401: Setup and specifications guide Service manual Service manual Quick start Setup and specifications guide

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Dell Latitude 5401 Service Manual Manual pdf 93 page image

For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed bya pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.The following table shows different power and battery-status light patterns and associated problems.Table 4. LED codesDiagnostic light codes Problem description2,1 Processor failure2,2 System board: BIOS or ROM (Read-Only Memory) failure2,3 No memory or RAM (Random-Access Memory) detected2,4 Memory or RAM (Random-Access Memory) failure2,5 Invalid memory installed2,6 System-board or chipset error2,7 Display failure3,1 Coin-cell battery failure3,2 PCI, video card/chip failure3,3 Recovery image not found3,4 Recovery image found but invalid3,5 Power-rail failure3,6 System BIOS Flash incomplete3,7 Management Engine (ME) errorCamera status light: Indicates whether the camera is in use.• Solid white — Camera is in use.• Off — Camera is not in use.Caps Lock status light: Indicates whether Caps Lock is enabled or disabled.• Solid white — Caps Lock enabled.• Off — Caps Lock disabled.WiFi power cycleAbout this taskIf your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed. Thefollowing procedure provides the instructions on how to conduct a WiFi power cycle:NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device.Steps1. Turn off your computer.2. Turn off the modem.3. Turn off the wireless router.4. Wait for 30 seconds.5. Turn on the wireless router.6. Turn on the modem.7. Turn on your computer.Troubleshooting 93

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