Warning - Failure to follow steps may lead in damage or injury from electrical shock. Before removing or touching the PCB board, the Capacitor needs to be checked for voltage. This device is the black cylinder on the camera. Place a voltmeter in parallel with the capacitor. If a charge is detected, make sure battery is removed from the device.
Furthermore, The positive pin is connected to the positive terminal and negative to the negative terminal. Then switch the setting of the multi meter to ADC for direct current amperage. .