Latitude D420 does not illuminate

Hello

My D420 turns off suddenly to the after no previous problems. Now it not at all lights when you press the button. It's the same thing with power supply battery or sector.

No light - not totally dead nothing!

I am a fairly competent hardware engineer, but don't know where to start with this one.  Any help gratefully received.

TIA

Bob

Hi Bob,

There are a number of steps, we can try to determine exactly what is happening with your system. If you can answer what follows below, this will help us to know where the problem lies:

  1. Remove the battery from the system - on the battery itself, you should see a button next to the LEDs and 5 LED. Please push this button and tell us what light, as appropriate.
  2. Please check the plug of the AC adapter and connector AC adapter inside the laptop for signs of damage. Please pay particular attention to the plug of the AC adapter - this should have a PIN in the middle that must not be bent or damaged in any way.
  3. Please connect your adapter on the sector. On the adapter, there should be an LED. Does the LED light up when it is connected to the power grid?
  4. If the adapter LED turns on when it is connected to the mains, plug the power adapter to the system. The LED on the AC adapter out or flicker?
  5. Just to double-check, please try turning on the system using power adapter only. You see everything light up in the system?
  6. Same as step 5, but please use the battery only. Again, you see everything light up in the system?
  7. Please connect the power adapter and the battery to the system. Then try turning on the system by holding down the FN key and pressing the power button. This can give you a code of lights where the lock light LEDs are (Num Lock, Scroll Lock, Caps Lock). Please tell me which of these LEDs light up, if necessary.
  8. At this point, we would deprive the system to its basic components. If you are happy to do this, please ensure that you remove the AC adapter and the battery from the system. Please remove the following components:
    a. memory DIMM
    b. the card (if installed) wireless
    (c) keyboard.
    d. Bluetooth Module (if installed)
    e. hard drive
    f. optical drive
    g. cable of the LCD Panel of.
    If you need instructions on how to remove these components, please consult the owner's manual here:
  9. With above removed components, please plug your power adapter and press the Microswitch to the power button. You can see the lock light LEDs lights up, please note that light up, if necessary.
  10. If Lock LED lights, please reinstall each component individually and turn on the system after that each component is reinstalled. Note that light up, is all.
If you can try the above, it would be a great help. Thanks again, hope to hear from you soon.

Tags: Dell Laptop

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