First try to check the battery or replace it. Then try to check the battery terminals the one that is connected in the pcb it might be loosed. Then try to check the sensor of your remote if good, in checking a sensor without using a tester you should have a cellphone with a camera, point the sensor in the camera lens then look at the monitor of your cellphone, if there is a red light that glows it is good, if no light glows try to replace it.
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