Re: Laptop Motherboard Repair

Hi,

Can anyone give a brief explination of how to use a bench supply to "smoke" out the shorted componant ? i know its probably not good practice but i have a couple of boards that i have extensively tested with my meter but have been unable to find the shorted part, i figure i have nothing left to loose if i damage the boards even more so might as well give it a go, do i connect the bench supply to the DC Jack input ? and what kind of voltages / amps would i be looking to use on a board that requires the standard 19v
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Re: hp 530 dead no power

Replaced PQ3 and PQ4 Mosfets all working fine now :-)

Re: hp 530 dead no power

Hi Retiredcaps

Cheers for the input, much appreciated i hadn't actually thought of checking Ebay but have now ordered one so many thanks :-)

I dont suppose my logic in thinking that there was voltage on one side of the mosfet and nothing at all coming out of the other side is an acurate way of testing mosfets ?

I am a complete newb at all of this in depth electronics but find it all quite interesting, i have got plenty of laptops lying around that all have some sort of power issue and i think i have the relevent...

Re: hp 530 dead no power

I have had a little further progress today on this, there is a MOSFET located next to R015 this was showing 18.5v on pins 1234 of the input side of the MOSFET but absolutely nothing coming out of pins 5678 and no power on the rest of the circuit after this so i am suspecting that the MOSFET is dead. The MOSFET in question is a AO4433 i have removed it from the board using my hot air station, but now i cant find a suitable replacement for it lol, Digikey and other sites dont sell this exact model anymore, unless i want 3000 of them which would be nice but...

Re: hp 530 dead no power

Hi, I have the same problem with exactly the same model of laptop, the dc jack is working fine and 19volts are present, i have a multimeter but i am unsure of how to test the individual componants on the board, i was just wondering if you ever managed to fix the issue and if anyone might have some advice ?

Thanks guys

Ste