Search found 5 matches

by SnusMurmik
Fri Jan 24, 2020 6:22 am
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 10760

Re: Startup test troubleshooting

I finally had the time to complete this project yesterday. I flashed it with an old firmware (.64), and all seems to work now! I only replaced the CPU and the voltage regulator. I used my bench power supply to power it (set to just 8V just in case..). The reason I used the old firmware is because th...
by SnusMurmik
Thu Apr 11, 2019 8:25 am
Forum: DSO Shell
Topic: Shell DSO 150 does not complete boot-up
Replies: 3
Views: 3876

Re: Shell DSO 150 does not complete boot-up

Probably the same thing that happened to me. Over-voltage destroys the LM1117, which then outputs more than 3.3V, which in turn destroys the CPU. I'm in the process of replacing these components myself.

You can contact JYE tech via email. They will probably send you a replacement.
by SnusMurmik
Fri Apr 05, 2019 5:44 pm
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 10760

Re: Startup test troubleshooting

Thanks! I thought I was so careful this time. It even booted the first time, but I guess there was a voltage spike when I removed the connector, or something. I have measured the power adapter, and it does go a bit over 9V when unloaded (several volts, I've forgot the exact number). I will try to fi...
by SnusMurmik
Tue Apr 02, 2019 5:40 pm
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 10760

Re: Startup test troubleshooting

On one of them, I de-soldered all capacitors and ICs, and finally found that it was the large IC (STM32 F103C8T6) that was shorting 3.3V to ground. I removed the voltage regulators from both this, and the board without the short. I did some testing, and found that the voltage regulators are outputti...
by SnusMurmik
Mon Apr 01, 2019 8:28 am
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 10760

Startup test troubleshooting

I have problems with three DSO shell units. Two of them did not boot up at all. One did boot up first time (with 9V power adapter), but next time I tried it did not boot up. One I tried with my lab power supply, and noticed that 1.5A went through the unit, until some component gave up a bit of smoke...