If polarities are crossed, it won’t cause the stereo to shut down, but can have an effect on the sound quality.
To expose the ports where the stereo and speaker’s wiring connects, unscrew the paneling at the back of your speaker housing.
Each speaker should have one positive wire port, which is marked with a black plus, and one negative wire port, marked with a red minus. Check if the positive side of the speaker connects with the positive port of the stereo through the speaker cable. Check if the negative side is also correctly connected.
Remove the front cover or grit off the speaker’s face. By letting your finger run along the outside rim of the speaker, make sure the cup of the speaker is not torn.
If there is a tear, it means the cup is blown, and it is recommended to replace the speaker, but it can be fixed temporarily by covering it with a strong adhesive, like duct tape.
Remove the traditional (cone shaped) speakers by loosening and removing the screws that keeps the speaker fixed in its housing. A flexible cone manufactured from very durable paper should be visible from the back of the speaker. Look in the cone for any tears. These tears could also be temporarily fixed with tape, but to prevent serious rattling when the stereo is in use, rather replace the speaker if tears are visible.
Stereo Repair: Stereo Problems
Open the back of the stereo and find all the wiring that runs from the speakers to the stereo.
By checking the wires that come from the speakers, make sure that all the speakers are connected to just one port each. If the wiring is incorrect, like crossed wires, it can be the reason for speakers not working at all.
If wires are exposed, the stereo can shut down completely.
Make sure there are no exposed wires at the back or anywhere of the stereo, it could be a reason for the stereo to short out. Also, if a power cable or a speaker wire is loose, it could touch something metallic in the stereo, shutting down the stereo.
The fuse of the stereo should be in a plastic tab, colored yellow, red or green. Remove it from behind the stereo, and once it is removed, look for fractures in it to determine if its connection has blown. Blown fuses can be replaced easily.
To repair stereo equipment takes a lot of investigating to figure out the problem. But once the problem is known, progress should be fast.