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Re: Left Speakers not working on A or B channel
Have you tryed yet to switch the right speaker where the left one is? If it works then you know the speaker is bad. If you move the left speaker over to the right channel and it works and sound now comes out of the left speaker, you know there is a fault in the amp somehwre. If your not a tech and have not had any solid state equipment repair experience, then your going to have to have the amp serviced by a trained tech.. Good Luck
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As power amps are just two amps joined together all you need do is identify the left channel and compare it with the right. Ignore any parts common to both channels. The first thing to do is a visual check. If something looks broken burnt, or odd compared with the right channel then you have probably found the culprit. I suspect you could have a power output failure. It might be that the output devices are separate transistors. They might need to be replaced.
By the way just follow either the internal speaker leads or the connections to locate the right and left channels.
Have you checked the final transistors on that weak channel? They may look fine but may be weak. You can pull them and check them on your multimeter with the diode check and cross it with the data sheet for that transistor.
audio board located inside the mainboard console to the right trace your speakers wire to bd, disconnect the three leads, 3 phillips screws, and examine bd for burns. If yes, ebay the board id for a replacement.
The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.
I recommend you swap your left and right input cables to make sure it's not a source issue.
So from your headunit, plug the left channel output into your amps right input and your right channel output into your amps left input.
If the same side is still not working then disconnect both (or single speaker if it bridged) the speakers from the not working side at the amp. Connect the front and then the rear speakers individually and retest to see if one of them works.
If one does work then check the cabling and speaker connections on the one that doesn't. If it's shorting out anywhere it will stop your amp from powering that channel.
Failing that, it could just be that your amp has partly failed.