I have already checked continuity in diode mode of the filters l4720, l4611 etc and there are no problems, the currents around the U3600 seem good, 5V arrives on the USB ports and 3Volt on the Bluetooth. What can I still check?
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Compare voltages between U3500/600 pins.
Also compare diode mode readings around both chips.
Also compare diode mode readings around both chips.