Finally solved iPad Pro 11-inch problem!
This is quite a new expensive iPad A2759 from 2022 so was worth diagnosing the logic board and doing the component level repair on it.
This iPad was in our workshop for quite some time as troubleshooting was made difficult by the fact we could not find the schematics for this particular model.
The iPad was dead on arrival. I noticed device was only taking 0.4amps on both sides of the charging port.
Sighted issue and opened device up. No liquid damage sighted.
Tried a new screen on the device, there was no change.
Tried a bare configuration, disconnecting any non vital components.
Unfortunately the device still wasn’t taking enough power to turn on.
Tacked on a new charging port and tested it again.
The device still wasn’t taking enough power.
The iPad battery issue is highly unlikely due to the age of this iPad.
In conclusion, this iPad has logic board damage and needs a logic board repair to turn back on again.
Unfortunately we cannot retrieve data from this device without repairing the logic board first.
The diagnostics process required thermal camera and a unfused DC supply to provide enough load for shorted components to heat up.
Image showing the component heating up upon high current DC supply on power line.
The failed capacitors responsible for the faults are shown on the photo below. Replacing these capacitors made the iPad good as new again.
As we did not have the schema to determine the values of the capacitors, we had to take them off the donor board for the same iPad model. In this case, the cost of the repair was just in labour and time necessary to discover the fault and replace the components. Much cheaper than buying a new iPad Pro!