Re: Acer aspire v3-531 dead, b+ short?

After some searching I read that running some power through B+ should heat up the faulty component, so I did this and found the marked capacitor gets hot.

I cannot locate this component on the circuit diagram to find its value and replace - can anyone help?

It appears the bottom of the cap goes around to the other side of the board to 0v, the top goes to a ferrite bead (I think that's what it is) and then on to +5V for the HDD.

I cant see any ferrite bead marked on the circuit diagram for this area. My...

Hi,

I have an Acer Aspire v3-531 (compal LA-7912P) which is dead, no lights at all.

Board looks good, no sign of damage or blown components.

I'm new to component level diagnostics but testing and tracing I find that B+ rail only has 0.2v, looking at the circuit diagram (found [URL="https://www.badcaps.net/forum/showthread.php?t=29834"]here[/URL] I presume this is fed from PQ1.

VIN is good (18.6v) and PQ1 is getting around 6v at pin 3, but only 0.2v reading at pin 1.

I've checked resistance from B+ to ground and...

Re: Acer Aspire E1-571 no power

Hi, I have the same laptop/motherboard as above, with no lights showing when AC is connected. I believe the battery is also depleted and have no way to charge it to test from battery power.

Thank you for the circuit diagrams these are very useful! After some testing with a meter it seems I have 19v going to PQ9 Drain, but no voltage at Source OR Gate - should I be seeing 19v at Gate?

If so, am I right in thinking that capacitor PC25 would be the fault? Best way to test this?