Identifying a Laptop Mother Board Power Problem

[teeigeryuh]

I'm pretty new to this of electronics, pretty much self taught.

I was just wondering if someone could guide me on where to check for bad capacitors/fuses?
I got this problem with this laptop that has no power thru 99% of the mobo.
Now I'm supposed to give my boss a reasonable answer to why this is, even if I can't fix it.

Sorry for the inconvinience, if you feel this is a waste of time or that I'm just posting crap, feel free to ban me or something, I understand.

Anyone mind pointing me in some direction?

 

[bigdogguru]

There appears to be a damaged inductor (PL10) in the first image, approximately 25% of the outer package is missing which includes one of the inductor terminals.

There is also what appears to me smoke residue deposited on the PCB, emanating from the area just below PL10,PL11 and extending downwards.

The loss of PL10 is certainly a contributing issue to the main problem, however there maybe other damaged components present, which are not detectable from sight alone.

It would also be prudent to test the condition of the charger/power supply pack, as it may have been damaged as well.


BigDog

 

[teeigeryuh]

The carger is fine afaik, I did have to change a fuse to be onest which is seen on the second pic.

Could you tell me what the name of pl10/11?

Also, thank you, this has actually thought me quite a lot.
Really, thanks.

 

[bigdogguru]

Could you tell me what the name of pl10/11?

Rather an odd question, do you not have the actual board or images available to you?

The identification names I mentioned are the PCB component silkscreen markings, PL10 and PL11. The actual markings on the components are 2R2 for the visually damaged component and its neighboring component is 1R2. They can be seen clearly in the upper left corner of the first image. The component marking of 2R2 typically indicates an inductor value of 2.2 uH and the component marking of 1R2 typically indicates an inductor value of 1.2 uH. You will need to consider both the maximum saturation current handling capabilities and the DC resistance of the original components when attempting to find a replacement. These types of inductors typically have a tolerance in the +/- 20% to 30% range. Also, there is a definite possibility of other damaged components, possibly to due a large power surge, particularly the SMPS device (PU9) which I'm unable to identify the actual component markings from the images you've provided. Of course, you'll need to check all other components for damage, a properly utilized multimeter may be enough in many cases.

BigDog