Apple iPad 4 CDMA – How to replace the battery

Apple iPad 4 CDMA; BATTERY REPLACEMENT PROCEDURE 

Slightly warm up the edges of front panel using hot air gun.

Releasing the adhesive along the top edge of the iPad, and slide the opening pick around the top left corner.

Slide the opening pick along the left edge of the iPad, releasing the adhesive as you go. The digitizer cable is located approximately 2" from the bottom of the iPad. Stop sliding the pick when you get 2.25" from the bottom of the iPad.

Using the opening pick that is still underneath the bottom edge of the iPad, release the adhesive along the bottom left corner. The bottom of the digitizer cable is only ~1" from the bottom of the iPad. Work carefully and slowly, making sure to not sever this cable.

Using one of the opening picks, pry up the bottom right corner of the iPad and grab it with your fingers.

Some of the adhesive along the perimeter of the iPad may have stuck back down again. If this is the case, slide a pick underneath the edge of the iPad where the front glass is still stuck and "cut" the adhesive.

Holding the iPad by the top and bottom right corners, rotate the front glass away from the iPad. Be careful of any adhesive that may still be attached, and use an opening pick to cut any adhesive that may still be holding the front panel down.

Remove the four 2 mm Phillips #00 screws securing the LCD to the aluminum frame. The bottom left screw is obscured by the home button ribbon cable connector. Carefully move the home button ribbon cable aside to remove the bottom left screw.

Using a plastic opening tool or a spudger, lift the right edge of the LCD out of the iPad. Rotate the LCD along its left edge and lay it down on top of the front glass panel. Be careful as you move the LCD. The ribbon cable is fragile and may break if it is flexed too much.

Using the tip of a spudger, peel back the piece of tape covering the LCD ribbon cable connector.

Flip up the retaining flap on the LCD ribbon cable ZIF connector. Using your fingers or a pair of tweezers, pull the LCD ribbon cable from its socket on the logic board.

Without touching the front of the LCD, lift the LCD off the front panel.

If present, remove the piece of electrical tape covering the Wi-Fi antenna, speaker cable, and home button ribbon cable.

Flip up the retaining flap on the home button ribbon cable ZIF connector.

Use a pair of tweezers to pull the home button ribbon cable straight out of its socket on the logic board.

De-route the home button ribbon cable from its recess in the rear case.

Using the tip of a spudger, peel back the piece of tape that secures the digitizer ribbon cable to the logic board.

Flip up the retaining flap on both of the digitizer ribbon cable ZIF connectors.

Use the flat end of a spudger to loosen the adhesive underneath the digitizer ribbon cable. Pull the digitizer ribbon cable straight out of its sockets on the logic board.

Peel back the digitizer ribbon cable and use the flat end of a spudger to release the adhesive securing the cable to the rear aluminum case.

Using your fingers, pull the digitizer ribbon cable out of its recess in the aluminum frame.

Remove the front panel from the iPad.

Peel back and remove the piece of electrical tape covering the headphone jack assembly cable connector. Using the tip of a spudger, flip up the retaining flap on both of the ZIF connectors securing the headphone jack cable to the logic board.

Slide the flat end of a spudger underneath the headphone jack assembly cable, releasing the adhesive securing it to the rear aluminum frame. Pull the headphone jack assembly cable straight out of its socket on the logic board.

Peel back and remove the piece of tape covering the SIM board cable ZIF connector. Flip up the retaining flap on the SIM board cable ZIF connector. Using the tip of a spudger, pull the SIM board cable straight out of its socket on the logic board.

Disconnect the following connectors from their respective sockets on the logic board:

Wi-Fi antenna cable
Speaker connector cable.
Dock/Lightning connector cable. There may be a piece of black tape covering this connector. Remove it with tweezers.
Make sure to pry underneath the connector and not the socket itself. Prying on the socket itself may cause severe damage.

Remove the following seven screws securing the logic board to the rear aluminum panel.

Six 2.1mm Phillips #00 One of these screws, at the top of the logic board, is tucked beneath the headphone jack assembly cable. Take care to hold the cable out of the way while removing and replacing this screw.
One 2.5mm Phillips #00

Holding the logic board by the side nearest the dock connector, carefully pull the logic board toward the bottom of the iPad.

Flip the logic board over, minding any cables that may get caught. Using the tip of a spudger, remove the three antenna connectors from their sockets on the logic board.

The battery is very firmly glued to the aluminum frame using copious amounts of strong adhesive. In the following steps, you will be removing the adhesive from underneath the battery 2 inches at a time. This will prevent too much stress being put on the battery. Be very careful to not puncture or damage the battery as you remove it from the iPad. Batteries contain toxic chemicals that can be harmful if ingested or inhaled.

Insert the flat end of a metal spudger underneath the battery near the bottom of the iPad. Slide the metal spudger approximately 1.5" underneath the battery, releasing the adhesive. The adhesive is very strong. Loosening the adhesive requires considerable force. Work slowly and carefully, making sure that the metal spudger does not slip.

In the same manner as described above, slide the spudger ~2" underneath the other adhesive strips.

Carefully slide the metal spudger underneath the battery connector, releasing the adhesive securing it in place.

Continue releasing the adhesive near the top of the battery.

Starting where the last pass left off, insert the metal spudger another two inches underneath the battery. As you push the spudger further underneath the battery, keep it as flat against the rear case as possible to avoid bending the battery. Repeat this process for the remaining adhesive strips.

In the same manner as previously described, continue loosening the adhesive on all the strips to a depth of ~4".

For the last pass, push the metal spudger all the way to the right edge of the iPad. Continue to do this for all of the adhesive strips.

Make sure that all the adhesive glue has been loosed from the battery.

Gently lift the left side of the battery up, rotating it toward the right side of the iPad. Use the metal spudger to loosen any adhesive that may still be holding the battery in place
Remove the battery from the iPad.