I recently purchased 2001 GS300; for some reason, the audio system works fine, except for subwoofer. All of speakers work but subwoofer. The subwoofer does not appear to have any physical damage. Is there a fuse just for a subwoofer amplifier? What things should I check?
This ad is not displayed to registered members. Register your free account today and become a member on Club Lexus!
First, I unplugged the subwoofer connector from the audio amplifier, then I connected a function generator and fed the signal into the subwoofer connector. The subwoofer started playing the signal. At this point I knew that problem is in the audio amplifier. Sure enough, after taking it apart, the Toshiba TA8225H audio amp chip is burnt. I can buy this chip, and fix it (being an electrical engineer helps) but the used audio amplifier (entire unit) is about $20 on eBay - so I'l just replace the entire unit.
I hope this info helps someone with similar problem.
Below are the video of subwoofer test, and a photograph of burnt IC.