内容简介：My old but good Dell Latitude E6410 notebook stopped charging and working with the original Dell AC power adapter some months ago. It was working only sporadic but in most of the cases the blue led of the AC power adapter went off after plugging it in. I t
My old but good Dell Latitude E6410 notebook stopped charging and working with the original Dell AC power adapter some months ago. It was working only sporadic but in most of the cases the blue led of the AC power adapter went off after plugging it in. I tried an other Dell power adapter but with the same results so I thought it was a hardware fault on the notebook side.
Nethertheless Krischan had an idea and tried an 20V power adapter from an other manufacturer. Turns out this one worked powering the notebook but charging was still disabled. An error message popped up in the BIOS “ AC Power adapter could not be determined “.
We did some research and found an interesting article mentioning an additional data pin (inner pin of plug) of the power adapter which is used by the notebook to “communicate” and validate the power adapter via 1-wire-protocol.
So the next idea was quite unusual but a step into the right direction. We used the power wires (PWR/GND) from the non-HP power adapter and wired the data pin + GND of the plug to the original HP power adapter.
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AC plug on the left connected to DATA and GND
We tricked the notebook into “thinking” it was still connected to the faulty 19V power adapter via the data wire and used the ac power from a secondary working power supply.
In the next step, we cracked the case of the HP adapter and desoldered the transistor style chip mentioned in the article above. It is connected to the data wire and marked with “DALLAS – 250X”.
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Cracking the power adapter case -
Three wires, blue is the data wire -
The DALLAS chip in question near the blue wire
The next idea was to put this chip directly into the notebook. We traced the data pin from the jack back to the connector on the motherboad. We cut the data line and soldered the DALLAS (MAXIM one wire) chip together with a resistor and diode to the board connector. The diode and the resistor are probably optional and belong to the protection circuit.
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Power connector on the motherboard with DALLAS chip -
Simplified circuit diagram
Surprisingly this hack is really working! We can now use any power adapter and the notebook is running and charging well. The BIOS still receives the correct information from the DALLAS chip, which is now soldered into the notebook.
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