Hello, I want to consult you regarding my UE Wonderboom Bluetooth Speaker's Amplifier.YouTube As you can see it makes a horrific buzzing noise. It's a bit different every time I replug the battery. Sometimes it has a high pitch noise together with the buzz, sometimes it turns on quiet but doesn't work and doesn't play turn on tone. The amplifier's / dsp's software also seems to be off - it doesn't turn off using button, doesn't play the turn on / off tones. However it charges as it supposed to do (checked with multimeter), bluetooth module functions work if it connects to phone. Thank you for suggestions.
here are the pictures of two pcbs, they connect to each other using black pin sockets.
pcb1 — imgbb.com
pcb2 — imgbb.com
pcb3 — imgbb.com
pcb4 — imgbb.com
pcb1 — imgbb.com
pcb2 — imgbb.com
pcb3 — imgbb.com
pcb4 — imgbb.com
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