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Power button LED behavior
On certain Dell Latitude systems, the power button LED is used to provide an indication of the system status, and as a result the power
button illuminates when pressed. The systems with the optional power button/fingerprint reader will have no LED under the power button
and hence will apply the available LED's in the system to provide an indication of the system status.
Power button LED behavior without Fingerprint reader
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System is ON (S0) = LED illuminates solid white.
•
System in Sleep/Standby (S3, SOix) = LED is off
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System is Off/Hibernating (S4/S5) = LED is off
Power On and LED behavior with Fingerprint reader
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Pressing the power button for a duration between 50 msec to 2 sec turns on the device.
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Power button does not register additional presses until the SOL (Sign-Of-Life) has been provided to the user.
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System LED's illuminates upon pressing the power button.
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All the available LED's (Keyboard backlit/ Keyboard caps lock LED/ Battery Charge LED) illuminates and displays specified behavior.
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The auditory tone is Off by default. It can be enabled in the BIOS setup.
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Safeguards do not time out if the device gets hung during the logon process.
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Dell logo: Turns on within 2 secs after pressing the power button.
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Full boot: Within 22 secs after pressing the power button.
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Below is the example timelines:
Technology and components
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Содержание Latitude 3540
Страница 1: ...Dell Precision 3540 Service Manual Regulatory Model P80F Regulatory Type P80F001 ...
Страница 19: ...2 Pry the base cover from the edge using a plastic scribe 1 2 Disassembly and reassembly 19 ...
Страница 22: ...2 Press down on the edges pf the base cover till clicks in place 22 Disassembly and reassembly ...
Страница 23: ...3 Tighten the eight captive screws to secure the base cover to the computer Disassembly and reassembly 23 ...
Страница 27: ...2 Reconnect the battery cable to the connector on the system board Disassembly and reassembly 27 ...
Страница 42: ...4 Lift the speaker up out of the computer 42 Disassembly and reassembly ...
Страница 44: ...2 Re route the speaker cables through the routing clips on the computer chassis 44 Disassembly and reassembly ...
Страница 49: ...3 Re connect the Heatsink fan cable to the connector on the system board Disassembly and reassembly 49 ...
Страница 53: ...3 Connect the system fan cable to the connector on the system board Disassembly and reassembly 53 ...
Страница 60: ...4 Remove the single M2x2 5 screw and lift the LED board out of the computer 1 2 60 Disassembly and reassembly ...
Страница 80: ...4 Carefully close the LCD screen 80 Disassembly and reassembly ...
Страница 85: ...3 Reconnect the backlit cable and the keyboard cable to the touchpad Disassembly and reassembly 85 ...
Страница 95: ...2 Gently snap the display bezel into place Disassembly and reassembly 95 ...
Страница 102: ...102 Disassembly and reassembly ...
Страница 104: ...4 Replace the four M2x2 screws that secure the display panel to the display assembly 104 Disassembly and reassembly ...
Страница 115: ...6 Turn on the modem 7 Turn on your computer Troubleshooting 115 ...