internal speaker stopped working

hey guys,

i got a serious problem with the internal speaker of my mytouch 4g slide, it suddenly stopped working. i can't remember whether i installed a special software or updated the rom because it happened some time ago.
at the first time i was pretty shure the internal speaker is just broken and replaced the flexcable with the speaker with a new one from china and tested it before i replaced it - it definetly works. after booting all worked fine except for the internal speaker while phoning
did you ever have this problem befor with another device or do you know a way to test the internal speaker to exclude a software problem?

ty in advice

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