Black screen, capslock and numlock flash 5 times

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HP EliteBook 1040 G4

The HP Elitebook 1040 G4 is a 14” laptop powered by Intel. The Elitebook 1040 G4 was released in September of 2017 and ranges in price from $1400 to $3400 roughly.

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Keith Moon @moondog77

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发帖于: 2021年12月4日

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Black screen, capslock and numlock flash 5 times

I have an elitebook 1040 g4 that I got as a failed laptop, I had it working intermittently for a while, then it stopped completely.

When I started looking at the issue, I took the board out, found I had knocked a diode off the board.

I've resoldered the diode, seems to be connected and passes a diode test on the multimeter.

Frustrated, can't find a schematic, not sure what's what.

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mike @aactech

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发帖于: 2021年12月4日

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This may help:

Disconnect the power supply and power the computer with battery power. This resets the Embedded Controller/Keyboard Controller.

Unplug the AC power from the computer.
Press and hold the power button for more than 12 seconds.
Release the power button (after at least 12 seconds).
The computer powers on and should boot normally.
Re-connect the AC power to the computer.

Source: https://support.hp.com/us-en/document/c0...

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I don't know why this is the go to solution for this issue because it doesn't work.

I should have added that I have tried this already.

由 Keith Moon 完成的 2021年12月4日

Not having a go, and appreciate all input on this issue, but there's a ton of YouTube videos that also say this that. Some of my reading on this issue is that I might be missing a power supply. Does anyone know the best test points and what voltages to expect. I have battery voltage, 3.3 and 5 and 1.8 and some lower voltages.

由 Keith Moon 完成的 2021年12月4日

@moondog77

Yes you should have. Saves us time and energy.

由 mike 完成的 2021年12月4日

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I don't know why this is the go to solution for this issue because it doesn't work.

I should have added that I have tried this already. — Keith Moon
Not having a go, and appreciate all input on this issue, but there's a ton of YouTube videos that also say this that. Some of my reading on this issue is that I might be missing a power supply. Does anyone know the best test points and what voltages to expect. I have battery voltage, 3.3 and 5 and 1.8 and some lower voltages. — Keith Moon

HP EliteBook 1040 G4

Black screen, capslock and numlock flash 5 times

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