To diagnose a faulty charge port. remove motherboard, plug into USB power and ran the multimeter along the pins on the dock connector (Where its soldered to the motherboard). if you get a reading of around 5V on 1 of the pins, then the dock is fine. To test if it is battery fault - You can attach the DC power supply to the battery connector (on motherboard). Just use multimeter to figure out which pin is gnd--(continuity with gnd shield on board). Attach negative lead to gnd pin (LEFT pin for the ipad AIR), and positive pin to the outermost pin on other side(RIGHT pin for ipad AIR). IF YOU USE ALLIGATOR CLIPS, USE WILL NEED TO MAKE SURE THE POSITIVE DOES NOT TOUCH THE SHIELD UNDERNEATH. CLIP IT ON THE CONTACT ITSELF. . Apply 3.8V. Start iPad via power button (for mini this requires a functional solder joint at home button flex). I USED 5V with DC power supply its ok. DO NOT SWITCH ON POWER YET Plug in the LCD apply DC power and NOW plug in the USB cable - should see apple logo hopefully - Remember before...
Put some Kapton Tape in the top left of the motherboard...Dont cover the antenna (gold clips) just the components around there...You will see the difference in the i9505.....extra components in that area which are touching the rear bezel...cover them and its will be sweet
Great instructions thanks and it would be even greater if you mentioned that you didnt have to remove flex cables for volume keys or even motherboard