Home stereo stopped working possibly has burnt out voltage regulator?
My Altec Lansing home stereo stopped giving out sound. There is still fuzz audible from the speakers, but there is no musical sound whatsoever coming through the speakers. It is a simple stereo but with good sound. It has one input Jack which has always been loose and finicky; as long as I carefully plug into the Jack and make sure it is a good connection, the stereo has worked fine. One day however it suddenly stopped giving any musical sound. I decided to open up the stereo and look inside. First I tried bypassing the input Jack since I suspected that was the problem. Bypassing the input jack however made no difference, there was still zero audio signal coming out of the speakers (still only the buzz). I then looked around on the motherboard to check for any oddities. Everything looked normal except for one Voltage Regulator. It is a L7809CV. It has three prongs and a built in heatsink. The point at which it connects to the motherboard is slightly burnt looking as it is discoloured. In the upclose picture you can see two voltage regulators, the one on the left is the one which appears burnt. I was thinking this is likely the culprit.
Would anyone on the forum have any feedback to offer. Do you think this is the problem, and would replacing the voltage Regulator likely fix the amp?