Kind of necroposting, but since this is my exact problem, why not chime in instead of making a new post for the same issues.
Just checking some things :
- the iPad Mini I have here (actually I have two, both died within a week after being used with the same crappy charger and fake cable) is completely dead. I measured the battery, which is at 2.65v. Should be enough to start it up, right ?
- first thing I did was seeing if it pulled any current, it didn't. Just stayed at a comfortable 0.00a.
- saw nothing blown up or damaged on the board under the microscope
- measured and got short to gnd on caps C8119 and C8120, which makes me think it's either U2 or PMIC. Replaced U2. Still nothing.
-measured diode D8100 which gives me 0.162v when the battery is not connected and 0.0v (short) when the battery is connected.
Anything else I can try before I'll attempt to replace the PMIC (which should arrive this week) ? I don't have a spare known working battery here, but since the one I have is at 2.65v and doesn't cause a short on its own, I'm not readily saying the battery is bad.. which might be wrong ?
update : removed the PMIC (what a <insert random swearing words here> to remove).. and the shorts are gone. Now let's pray I didn't pull any pads. It really took a lot of heat (500 degrees celcius) and a !&&* of lot of flux. I removed the underfill around the PMIC before I started, but still.. this is one of the most stubborn ICs to remove I have encountered so far.
Questa risposta è stata utile?