Went to try to fix my daughters ASUS laptop and made it much worse :) She did not have her power supply so I used mine - I have an ASUS netbook. The plug was not the same but the VA are so I rigged up what I thought was the correct one but when I plugged it in it would not light the "PSU conne cted light". Although the laptop worked, without a charger it was no use.
As it was working before I got my hands on it I assume my connector somehow caused the PSU circuit to blow. The DC Jack goes to a plug on the mobo an d I tested it in situ - there was 19v at the mobo socket, so the prob is fu rther down the line.
I had to take the laptop completely apart to get at the mobo components to test points, and cannot easily re-connect everything to test the whole. I s tripped it down and sure enough there is a burnt-out component - looks like a SM cap (MLCC) but cannot be 100% certain due to ignorance.
The mobo is an asus k501j
Found the schematic
It looks as if the burnt one is an MLCC - a capacitor but, as I am not sure I have got the right schematic and cannot trace the wiring on the board it self (it is too thick) I guess I can only go ahead and replace it and hope for the best.
Can I test the mobo with nothing apart from power or do I need to reassembl e? Can I simply remove the component and see if the laptop works without it ? There could be a further fault. Presumably I do not need a MLCC - a regu lar cap would do it provided it is rated at 25v? Thought I could maybe try to find one on an old computer board as it looks like you cannot easily buy just one MLCC.
Hers a photo of the mobo showing the component and the schematic:
Here is a bigger pic of just the mobo:
Any help gratefully appreciated.