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Hi , i have a 1st gen ipad which does not seem to be charging , i got some charge back into the battery ( about 30 %) using a bench psu , so i’m assuming battery is ok I have been checking voltages around the board , ( ive included the schematic , page 17 , i couldnt save 1 page for some reason ) i have 4.2 volts at L1900 & L1950 . Which line should be charger voltage back to the battery ? IPAD1 MLB.pdf
Hopefully you are using it with a Mac. If so. download and run Coconut battery. There is an icon on it with and iOS device. Click on it to find out the status of your battery. Someone may have a better idea if you are using a PC. http://www.coconut-flavour.com/coconutba… UPDATE 4/20/17 Yes the coconut Battery seems to be working and your iPhone looks good. However it looks like it does not see the iPad battery. iPad Wi-Fi Battery Replacement iPad Battery
The iPad uses a totally different charge circuit from more recent iDevices. It seems to differentiate between portrait mode and landscape mode. I have never worked on an original iPad so I can only give you some guidelines. So in essence: • PORT_DK_IDGATE / LAND_DK_IDGATE will go low (0V) to “close the switch”. • PPVCC_MAIN_FUSE & BATT_POS are connected together via Q1901 & Q1951 and battery charging occurs. • When the battery is fully charged, PORT_DK_IDGATE / LAND_DK_IDGATE goes high and cuts the connection between PPVCC_MAIN_FUSE & BATT_POS. However, due to the Body Diode in the MOSFET, BATT_POS can still supply current to PPVCC_MAIN_FUSE and hence the rest of the device.
