Step 1: FAIL

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rlw1138
Posts: 1
Joined: Sat Mar 30, 2019 10:03 pm

Step 1: FAIL

Post by rlw1138 »

I applied 9v battery to my new DSO Shell, the screen turned white (with a very dim "logo" of TY in a circle), and LED D1 lit up brightly without flashing. Sadly I did not see anything resembling an oscilloscope screen! :cry:

Soldered JP1 and JP2 and connected my CP2102 USB-to-TTL interface and get this message: "No response from the target, the Boot loader can not be started....."
I tried slowing the speed down to 9600 -- and 1200! -- and tried the RX and TX points and also RX1 and TX1. I tried disconnecting 9v and using the 3.3v source on the interface. Same result each time.

The front of the board is fully populated, but I noted several components are not mounted to the foil connector for the LCD: C11, C12, C13, C14, and R1 are not in place. Is this correct? [in the photo below, connections 21 to 24 on the ribbon look like they're solder-bridged, the they are not]

Is there any hope for salvaging this board? As I understand it, the bootloader code is installed by the manufacturer....can it be re-loaded by us end-users?

What about replacing the STM32, is that feasible for someone who's never soldered an SMD device? :o


Image
https://www.dropbox.com/s/9zr9s353xy8lb ... 103912.jpg


Image
https://www.dropbox.com/s/l1xxiwpxucylx ... 103843.jpg
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