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Philips TAH8506 left driver not working

I know how to get inside but can't find the problem. What should I do?

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@milkinabucket open both sides. Measure the crossover cable from the right to the left side for continuity (ohmmeter). It could be a loose solder connection on that wire. Of course, it might help if we see both of those sides (opened up to the drivers of course :-)

Adding images to an existing question

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Edward Maruss crwdns2934231:0crwdne2934231:0
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