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23941
June 5th, 2015 04:00
XPS18 with external Power Pack
Hello,
to extend the battery-life of my "XPS18" during longer voyages i bought a "RAVPower®
23000mAh Externer Akku Pac".
After having found the right plug i have noticed, that Dell still needs the "1-wire
Pin-" for determining the power supply - for what reason ever
The very bad thing is not that the battery is not charging but that even the prozessor-power is
reduced to a minumum - 0,60 Ghz instead of 2,0 - which is absolutely rediculous.
So i ended up in dismantling the power supply to search for the 1-wire-chip. Is it the thing that
looks like a smd-transistor right between the 130 ohm resistor and the diode ? Or is it just a simple "Voltage-non-chip-thing" with the XPS18 ? - Ciruit-Plan available? Any hint would be aprecheated
But before going any deeper - is it somehow possible to prevent the "XPS18" from reducing
CPU Power by "Software-Solution" ?
I don't mind that Dell prevents other power-supply manufactures from competition
but as DELL himself does not offer any power-pack-Solutions i think it is hard to let
their customers suffer for this.
Can anyone help ?
joerg63
9 Posts
0
June 11th, 2015 13:00
oops - double post (deleted)
joerg63
9 Posts
1
June 11th, 2015 14:00
Hi,
this took a little longer to solve.
First i had to open the Dell power supply.
I knew that Dell uses 1-wire devices, but first i did not find it on the circuit board of the Dell/ liteon 1650-02D3, because i searched for a TO-92 or 8-pin package.
It was already there but looked like a normal smd-transistor to me and as all labels were removed i had to search the internet a long time since i found a picture of the Dallas/Maxim DS2502 in a SOT-23 package on a russian website - then it all made sense ;-)
The three needed components (1x 130 Ohm resistor, 1x diode and the 1-wire chip) are very small smd parts - not bigger than 3 mm. It was a hard job for me to unsolder them safely.
The rest was easy then.
Now everything works as expected:
I can use any power-pack, any power supply, internal batteries are loaded and cpu-power is not reduced anymore ! Also I can still use the Dell power-supply ;-)
That's it.