Hi @dicky007 ,
Post some images of the board and the wires etc
Here’s how to do this. Bilder zu einer vorhandenen Frage hinzufügen
In most electronic devices the red and black coloured wires are used for the power supply. The convention is that the red goes to the +ve side of the supply and the black to the -ve side of the supply.
If the device has batteries check the wires that run from the +ve and -ve terminals in the battery holder. If they are OK look at the board and see if there are any markings indicating +ve and -ve where there might have been wires connected.
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