2d42 does not turn on with batteries, for USB yes

amy

Please test the voltage of the battery to confirm whether the battery is faulty.

amy

Please use the battery forpower, and test whether these voltages are correct.
VBAT: When you power the scope by battery, it should be equal to the battery voltage.
3.3V: When you power the scope by battery or adapter, regardless of whether it is turned on or not, the voltage is always 3.3V.

amy

Please check whether these two chips are burnt out. If so, please replace them.
U14/U15: HM5431A