Hello all,
A friend asked me to look at her macbook after she 'smelt burning' and it turned off. She tells me they spilt coffee approx 6 months ago on it but it only popped a few days ago. I took the back off to have a look and there is clear sign of liquid damage and a smoking gun area around Q7155 (see attachments). I cleaned the area up a bit with IPA and it doesnt look as bad as i first thought. The other components around there still actually look intact - I realise that is likely just superficial. I took some measurements and there are a lot of shorts to ground, but fingers crossed its just a capacitor shorted. As per the 2.png schematic, i find ground on all the bits shown in yellow, but suprisingly on the left side of L7130 (pin1) i can get 18.5v-19.2v (varying - not sure what that means) when i plug the charger in. I have disconnected the battery to check this as it was so easy to remove and eliminate a possible cause.
So my question is, from 2.png, can i assume its one of the capacitors that is shorted to ground, or could Q7155 have actually caused this short somehow?
Also how can L7130, an inductor i guess, be capable of having 19V one side when the other side is grounded through a fault - surely that would indicate L7130 is blown too perhaps?
I dont have the hot air skills yet to confidently take the such tiny caps off and replace so its more a learning question really. I am veering to get my friend to send it to someone whom does this for a living but every day is a school day.
Many thanks in advance.
A friend asked me to look at her macbook after she 'smelt burning' and it turned off. She tells me they spilt coffee approx 6 months ago on it but it only popped a few days ago. I took the back off to have a look and there is clear sign of liquid damage and a smoking gun area around Q7155 (see attachments). I cleaned the area up a bit with IPA and it doesnt look as bad as i first thought. The other components around there still actually look intact - I realise that is likely just superficial. I took some measurements and there are a lot of shorts to ground, but fingers crossed its just a capacitor shorted. As per the 2.png schematic, i find ground on all the bits shown in yellow, but suprisingly on the left side of L7130 (pin1) i can get 18.5v-19.2v (varying - not sure what that means) when i plug the charger in. I have disconnected the battery to check this as it was so easy to remove and eliminate a possible cause.
So my question is, from 2.png, can i assume its one of the capacitors that is shorted to ground, or could Q7155 have actually caused this short somehow?
Also how can L7130, an inductor i guess, be capable of having 19V one side when the other side is grounded through a fault - surely that would indicate L7130 is blown too perhaps?
I dont have the hot air skills yet to confidently take the such tiny caps off and replace so its more a learning question really. I am veering to get my friend to send it to someone whom does this for a living but every day is a school day.
Many thanks in advance.
Attached Files
