Why my oppo f1s left speaker in the bottom is not working

Solution
If you have an multi-meter - check the resistance of that speaker. If you read between 4 and 8 Ohms - speaker is OK.
If you don't have multimeter - connect wires going to the speaker to a 1.5V battery. If you hear a click from the speaker, it is probably OK.
Or you can just switch speakers.
If you have an multi-meter - check the resistance of that speaker. If you read between 4 and 8 Ohms - speaker is OK.
If you don't have multimeter - connect wires going to the speaker to a 1.5V battery. If you hear a click from the speaker, it is probably OK.
Or you can just switch speakers.
 
Solution

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