For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
i got 5v, on ppdcin, drawing 0.17 amp,
ppbus and pp3v3_g3h cycling, found that pp3v3 is shorted to ground,
I saw a tiny hole on cd3215, so I remove the chip but pp3v3 still shorted, is my only way to inject voltage ? if yes can I go over 3,3v ? thanks.
You can try, but current could be to low to heat something.
May need to wait few minutes and use alcohol method to detect if something heats a little bit more than other thing.
Lucky scenario if some chip enters in avalanche process and gets really hot...
removing both cd3215 doesnt remove the short, still 30ohm resistance to ground..
u2800 looks fine, I tried removing u7000 to see if the short is gone, but still the same, injeting 3.8v make the board at the right side near usb c side just a a very bit bit of warm
Yeah i replaced redriver chip and both cd3215c00 , without battery it pull about 0.05Amp
, ppbus 0.5v, but not shorted to ground, without battery, and i only get 5v on dcin, does this mean my cd3215 is defected ? but the macbook still can be turn on, so..
i notice when running on battery, the cpu is extremely hot, and I checked ppbus_g3h_cpu is shorted, can I inject to this line or should I remove caps 1 by1 ?
and does this ppbus_g3h_cpu has anything to do with me not getting 20v ?
It Turns on means i get an image, the trackpad click, and I can login and use it for youtube etc.. but when i touch the heatsink its extremely hot.., i thought something must he shorted.., any chance that ppbus_cpu is shorted without affecting ppbus_g3h?
If only by charger, macbook cannot turn on, but with battery, It can turn on.., I check the ppbus is shorted or not when its not connected to batt / anything
Guys, he's obviously checking for a short IMMEDIATELY after powering off the board. OP, let the board discharge for 2-3 minutes and then check for short on ppbus. It will show a short if you check it immediately after removing power. If it shows a short, then check again after 30 seconds. Keep checking and I guarantee the "short" will go away.