High Voltage Forum

General electronics => Computers, Microcontrollers, Programmable Logic, Interfaces and Displays => Topic started by: Mads Barnkob on November 07, 2019, 09:21:07 PM

Title: HP T620 Thin Client - PSU Hack And Windows PC Modification
Post by: Mads Barnkob on November 07, 2019, 09:21:07 PM
The HP T-620 Thin Client is a powerful little machine, that with ease can be hacked into using a random 19VDC PSU and run Windows as any normal PC, easy and cheap PC!

This thin client was thrown out, without anything else than the box itself, no power supplies, no nothing.

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The port and connector layout from the manual shows that the HP T-620 models needs a 19VDC power supply. A little searching showed that it was not as simple as just supplying it with 19VDC. HP has put in a few tricks to make a "smart laptop charger" so that you can only use their chargers.

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The "smart laptop charger" restriction can be bypassed with a simple current limiting hack as per this little schematics.

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All credits for this hack goes to:  http://nerdipedia.com/wiki/tiki-index.php?page=Smart+laptop+charger

The machine itself is powerful enough to put a little work into modding it into a PC, running Linux or Windows off a USB disk or for some models, you can even find a spare SSD slot on the motherboard, unlucky for me, this model does not have that option.

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Title: Re: HP T620 Thin Client - PSU Hack And Windows PC Modification
Post by: Experimentonomen on November 09, 2019, 08:26:43 PM
I always through that smart psu thing was like eeprom based where the middle pin is an all digital thing.
Title: Re: HP T620 Thin Client - PSU Hack And Windows PC Modification
Post by: Hydron on November 10, 2019, 08:40:54 PM
I always through that smart psu thing was like eeprom based where the middle pin is an all digital thing.
For Dell laptop chargers this is indeed the case - they actually use the exact same plug as the HP ones, but with a maxim one-wire bus EEPROM chip wired to the central pin. This chip or the wire going to it is easy to kill (there isn't any added protection on it, and it's 3.3 or 5V max) so it's a leading cause of otherwise good PSUs stopping working.