HP Zbook AC adapter 0V at output

[denem271]

Hi, i am facing with an ac adapter that has no voltage output, the main voltage supply is 120 VAC, the center pin of the cord seems bent, is there a way to get a schematic diagram or more information on how to diagnose TEA1716T ic?

Thanks

[stj]

Re: HP Zbook AC adapter 0V at output

before you do that - check the cable for open wires or shorts - it's common on laptop psu's

then get the datasheet for the chip - they often have example circuits in them that almost match the board!!

[PeteS in CA]

Re: HP Zbook AC adapter 0V at output

https://cdn.badcaps-static.com/pdfs/...f06b063bd3.pdf

[jayjr1105]

Re: HP Zbook AC adapter 0V at output

Remember, center pin on those is usually a sense wire and not + or -. The inner part of the barrel is usually the + .

[momaka]

Re: HP Zbook AC adapter 0V at output

Also, if you saw any damage to the cord, there's a good chance wires in it could be either shorted or open-circuited. So I suggest opening the adapter and unsoldering the output cord, then see if the adapter turns On. Most of the time, I've seen the (+) conductor short to the (-) conductor, especially if the output cord uses coaxial-type construction (i.e. where the signal conductor has an insulation layer on top of it, followed by the + conductor and another insulation layer on top of it, followed by ground and finally the cord's insulation). I have also seen wires open, though - typically near the laptop plug's end. Then the adapter seems to work, but there is no power coming out of the output plug.

So output cord/wire would be my first suspicion when dealing with a faulty laptop adapter. A lot of owners just don't treat them kindly.