Philips HeartStart XL M4735A defibrillator can not be turned on failure repair

Symptom: The M4735A defibrillator is connected to the AC power supply. The power indicator is on and cannot be turned on.

Inspection steps and maintenance: First suspected that the encoder is faulty, the encoder is replaced, and the fault remains. Then suspected to

be the paddle, the test found that the fault occurred on the paddle and repaired the paddle.