Acer 8943G Accidental Short, No Power

[grahamw01]

Hi everyone,

I have had an absolute nightmare this morning, I wanted to try to format an mSATA SSD in my personal laptop, so I took out the wifi card and put in the SSD, stupidly enough while the power cable was still plugged in, but then the wifi cable moved and shorted something and there was a big spark, now when the adapter is plugged in the light on the adapter goes off because something has shorted.

I could have sworn the wifi cable only touched some pins on the mini pci/msata connector, but looking at the motherboard it looks like the spark was on a capacitor near the power input. I have attached a picture.

I just checked resistance on the 0V and 19V input connector and its only 4 ohms, which I am sure is not right? The motherboard is a da0zyamb8d0 rev D.

Please please please help me someone I really need this laptop to work again

[grahamw01]

Re: Acer 8943G Accidental Short, No Power

I have just tried to run the laptop off battery and it does actually still work! The battery was not inserted when I made the short.

[meritosari]

Re: Acer 8943G Accidental Short, No Power

schematic:

[grahamw01]

Re: Acer 8943G Accidental Short, No Power

thank you meritosari

It is a capacitor thats looks damage, but it was my understanding that an SMD capacitor can not fail to short? or am I wrong here?

[smali]

Re: Acer 8943G Accidental Short, No Power

if 4 ohms showing with GND main 19v line so check the capacitor removing one by one between the PD3 like PC1,2,3,4,PC245 ,PC246 and also check the connector and adopter.

[smali]

Re: Acer 8943G Accidental Short, No Power

sorry for my reply after the rectification of your laptop i did not see your reply any way congratulate to you on coming back live your laptop.

[grahamw01]

Re: Acer 8943G Accidental Short, No Power

Hi smali,

Thanks for the comments. No the laptop is not fixed, it just works on battery, but something on the AC side has shorted making the adapter turn itself off.

Thanks

[Ramee]

Re: Acer 8943G Accidental Short, No Power

Hi smali,

Thanks for the comments. No the laptop is not fixed, it just works on battery, but something on the AC side has shorted making the adapter turn itself off.

Thanks

Could be a shorted component like smd capacitor.
i fixed one like this before, it shut off the charger, but when its unplug, the chagrer light turnd back on.

[fddizon]

Re: Acer 8943G Accidental Short, No Power

I have just tried to run the laptop off battery and it does actually still work! The battery was not inserted when I made the short.

Remove pl2 to determine which side has short. See page 37 on the schema. Test again resistance Between pin 1 and 4 of jp2 after removing pl2 coil. If short remove ceramic caps and test one by one. If short on the other side of the coil check pq13 and pq14.

[ravi_1617]

Re: Acer 8943G Accidental Short, No Power

your image is saying its a capacitor short which is burnt from wifi wire replace it

[grahamw01]

Re: Acer 8943G Accidental Short, No Power

Excellent thank you all for the tips, I will give it a go tomorrow when i have the necessary equipment.

I think it will be PC256 since this is where the spark was. If so, this is a 22uF 25V 1210 capacitor. I have been searching for this capacitor and found a Murata GRM32ER61E226KE15L fitting the same details. However there are many different types, what does X5R, MLCC mean? Is a tolerance of 10% okay?

[grahamw01]

Re: Acer 8943G Accidental Short, No Power

Thanks for all your help guys, I ended up just replacing the capacitor with a 22uf 35V tantalum capacitor and so far it has been working for about 10 minutes! Really appreciate everyone's help here.

[sparker1]

Re: Acer 8943G Accidental Short, No Power

Nice work.

[BGUERBET]

Re: Acer 8943G Accidental Short, No Power

I had the same problem without short-circuit.
I took the condenser from an other 8943g motherboard
One of them was cout-circuited with a 7 ohms value...

thank a lot for all !!!

Bertrand from Paris !

[ricaik2005]

Re: Acer 8943G Accidental Short, No Power

anyone please be of help, how do i disable the ati graphics and use only the intel display on this board.
because the ati graphics is really disturbing and want to do away with it.

thanks in advance.