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

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Post time 2020-8-14 09:56:21 | Show all posts |Read mode
2d42 arrived with the batteries turned upside down, with the polarity reversed. It does not turn on with batteries, it only turns on with USB cable. It was tested with other batteries and it does not turn on. How can I repair it or how can I get the electrical diagram of the equipment to analyze the board

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Use magic Report

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Post time 2020-8-15 09:38:54 | Show all posts
Please test the voltage of the battery to confirm whether the battery is faulty.

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 Author| Post time 2020-8-16 00:31:59 | Show all posts
Batteries are fine, 3.8v

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Post time 2020-8-17 15:48:18 | Show all posts
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.


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 Author| Post time 2020-8-19 15:24:20 From the mobile phone | Show all posts
VUSB: 4.8v  - VBAT: 3.7V - 3.3V : 3.1V

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Post time 2020-8-21 14:53:20 | Show all posts
Edited by amy at 2020-8-21 14:55

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



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Post time 2020-9-7 10:32:57 From the mobile phone | Show all posts
Hi , I have the same problem . Remarks:I have a problem with battery charge, the oscilloscope doesn’t charge the battery but when I connected to the cable charger and the computer the Osciloscope works well but doesn’t charge the battery

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Post time 2020-9-7 10:34:50 From the mobile phone | Show all posts
I check the voltage out : same as Mr cm electronica
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