Latt 5490 power button fail

Question

I have a batch of these 5490 laptops from early 2018 that are having problems where it refuses to power up.Symptoms: -No activity on power button-no charger indicator when charger plugged in-no life when swapping the internal batteryIts becoming a major problem and I have no idea what to do other than call support and have them swap the motherboard. I have a laptop next to me with an already swapped board and the same issues arrise.HOWEVER, it didn't power up on Friday when I grabbed it off the pile, but did first thing monday! Nearly impossible to replicate, and inconsistant.Anyone else with buggy 5490 and power?

ieee488 · Answer

DC jack?

U2CAMEB4ME · Answer

Welcome to the Dell Community @WynbergBoysHS

Hold down the "D" key, push the power button, release the power button, wait 2-3 seconds and release the "D" key

The laptop should go through an LCD test of solid White, Red, Green, Blue and Black 2 or 3 times.

After completion it should try to automatically boot 2 or 3 times.

If it does not boot, then the next thing would be to disconnect the BIOS/CMOS battery.

https://www.dell.com/support/manuals/en-us/latitude-14-5490-laptop%20/lat_5490_om/removing-the-coin-cell-battery?guid=guid-61ba6717-fc02-4136-bb4c-80cbb848e677&lang=en-us

Disconnect the AC adapter and remove/disconnect the “Main” battery.

Disconnect the “Coin-Cell” battery.

Connect ONLY the AC adapter for 3-5 seconds.

Then disconnect the AC adapter.

Connect the “Coin-Cell and Main” batteries ONLY.

Turn the laptop over and open the lid.

NOW connect the AC adapter.

It should try to automatically boot 2-3 times.

Post your results.

Best regards,

U2

Latitude

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