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Diagnostic & Test Tools
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Diagnosing before replacing
DC power supply: powers a board without a battery and shows current draw, which reveals shorts and boot loops.
Thermal camera: finds the hot component on a shorted rail in seconds.
Boot cables and test fixtures: power phones or test boards outside the housing.
Programmers: read and write battery, True Tone and Face ID data.
FAQ
What is the first tool for diagnosing a dead phone?
A DC power supply with a boot cable – the current draw pattern shows whether the board is shorted, not booting or stuck.
How do I find a short on a motherboard?
Inject a low voltage into the shorted rail with a DC power supply and look for the component that heats up, using a thermal camera or freeze spray.
What does a programmer do?
Programmers read and write data stored on chips, such as battery health data or screen True Tone data, so it can be transferred to a replacement part.



































