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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
My Dell laptop PC moves almost daily between different places, each with its own charger. One has a scrounged HP charger, whose voltage and power and connector are identical to ones from Dell. It was a nuisance to see: That's the laptop disparaging a power supply whose brand is "wrong".
These power connectors have three contacts: metal barrel outside, metal barrel inside, and center pin. The center connection goes to a power supply ID ROM, in 3-pin TO-92 package, using a 1-wire serial protocol invented for such things. It makes sense that when a laptop model wants a 90 watt PS and finds a 60 watt PS, it might slow down & not charge the battery. It's sad when it does that for someone else's 90 watt PS, which might be identical except for the label sticker and machine-readable ID.
No problem. I made a spoofing extension cord, grafting a power input connector from ebay onto the output cable from a dead 90 watt Dell PS. Including just enough of the circuit board to get the ID ROM (and, as it happened, an LED and a RF choke).
Registered Member #62109
Joined: Sun Jan 28 2018, 10:00PM
Location: Porto Alegre
Posts: 56
I think the real problem is not even psu power but psu voltage. There are some that are 14V 16V maybe, 19V. Not all them have the same voltage. If yours have, then the worst would be a dead psu lol. Nice trick.
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Spoofing a laptop charger checker
