C100f loud buzzing sound only

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Tfng

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When I turn on unit it just buzzing noise is heard.
Also when alarm is is turned on. Everything ok,, but once it's been triggered buzzing only and a thumping liked sound ( like lo frq .feedback)
Any have idea how to repair I just ordered all of chips, cuz their cheep.
But don't want to go in just changing chip like am crazy. Please help
 
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