Question about Dell POWER SUPPLY PS-5201-5D (PS52015D) Power Supply

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Latitude D505 Just bought new charger so the problem its not powercord or some I guess. The charger /PA-1650-05D/ has small green light what comes on when pluged. Problem is, when I plug it in the laptop /Dell Latitude D505/ the green light dissapeares and there is not measureable power end of the powercord. Took laptop apart to see is there anything wrong with a jack but could not see anything not a crack on connection or some. Have to unplug my power from socket, plug it again and tried to measure the jack pins, even didnt see the green light but of course nothing. Pls help, for the only thing Ive been advise to change the motherboard, but the whole laptop doesnt worth, what they asking for one. Hope there could be another solution and sorry for my bad language. Thx!

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Just repaired a laptop with the same symptoms:
Won't charge the battery, won't power from AC.
Also if you power the AC adapter when not connected to laptop you get green power LED on the adapter. When you plug it in the laptop the green power LED immediately goes out.

Opened it up and found SO-8 P-ch mosfet by the DC input socket. Source (pins1,2,3) is connected to the inner barrel (+19.5V), Gate 4 gets driven low, applying the input to the Drain. (pins 5,6,7,8) On my board the drain was short to GND. Applying power directly to the Drain via a current limited bench PSU (set 1A limit) showed a couple of volts.

Placing a finger on the opposite side of the board revealed a SMT ceramic cap getting hot.
CP13 I think. Opposite side to the power connector, almost under it. I would guess at 1206 or slightly larger and there is an 0402 cap just next to its bottom pad at 90 degrees to it. Cap was glued before soldering so had to flow both sides at the same time with a soldering iron and force off. Would likely have been 1uF or bigger 25V. Removal restored operation. Runs OK without but would suggest putting something in there 0.1uF 1206 50V, perhaps a couple stacked ?

BTW you have to strip down everything and remove the main board to get to the cap :-(

Hope this info is of use....

Robin
die4laser.com

Posted on Nov 13, 2008

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