If the PCB was connecting two connectors together with testpoints in the middle that might have been the case. But it is much simpler than that. Right above ph

If the PCB was connecting two connectors together with testpoints in the middle that might have been the case. But it is much simpler than that. Right above photo there is a gif showing that all the pins for one connector are connected to battery, while other connector connects to LEDS and afterwards ground.