Well, this iPad is not charging. How do you determine whether to change battery, charging port or fix motherboard?

A Tristar Tester will help you work it out quick.

Step 1

Plug it in.

This one shows a caution sign, indicating a faulty U2 IC.

Step 2

Press the right button to run a scan.

Step 3

The result reads All Tristar/Hydra test has failed.

This confirms that U2 IC is faulty, you quote customer for the repair now.

Step 4

Repair the IC..

Step 5

Test again. The caution sign shown before is gone.

Step 6

Click the button to run a quick test, if "PASS!" then congrats!

If not you can repeat the steps to fix other issues.

This device saves us a lot of debugging time.