Dell Latitude 5400 Service Manual - Page 109

WiFi power cycle

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For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by a 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 3. LED codes Diagnostic light codes 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 3,1 3,2 3,3 3,4 3,5 3,6 3,7 Problem description Processor failure System board: BIOS or ROM (Read-Only Memory) failure No memory or RAM (Random-Access Memory) detected Memory or RAM (Random-Access Memory) failure Invalid memory installed System-board or chipset error Display failure LCD power rail failure. Replace system board Coin-cell battery failure PCI, video card/chip failure Recovery image not found Recovery image found but invalid Power-rail failure System BIOS Flash incomplete Management Engine (ME) error Camera 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 cycle About this task If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed. The following procedure provides the instructions on how to conduct a WiFi power cycle: NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device. Steps 1. 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 109

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For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by
a 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 3. LED codes
Diagnostic light codes
Problem description
2,1
Processor failure
2,2
System board: BIOS or ROM (Read-Only Memory) failure
2,3
No memory or RAM (Random-Access Memory) detected
2,4
Memory or RAM (Random-Access Memory) failure
2,5
Invalid memory installed
2,6
System-board or chipset error
2,7
Display failure
2,8
LCD power rail failure. Replace system board
3,1
Coin-cell battery failure
3,2
PCI, video card/chip failure
3,3
Recovery image not found
3,4
Recovery image found but invalid
3,5
Power-rail failure
3,6
System BIOS Flash incomplete
3,7
Management Engine (ME) error
Camera 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 cycle
About this task
If your computer is unable to access the internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed. The
following procedure provides the instructions on how to conduct a WiFi power cycle:
NOTE:
Some ISPs (Internet Service Providers) provide a modem/router combo device.
Steps
1.
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
109