Weird sound of the main unit...please help me to figure out

Re: Weird sound of the main unit...please help me to figure

Seems to be "input voltage abnormal". Check inside for loose wires and/or wires making contact where they shouldn't.

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Re: Weird sound of the main unit...please help me to figure

Did you check that battery? I had similarly odd behavior that I narrowed down go one bad battery.
 

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