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  • dso_15001k
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Is This Situation Repairable

jw0752
jw0752 over 8 years ago

A while back I posted a blog about building a DSO Shell 15001K Oscilloscope Kit.

 

https://www.element14.com/community/people/jw0752/blog/2017/04/25/building-the-dso-shell-15001k-oscilloscope

 

I gave one of these kits to an old friend and he called me a few days later to say that the preliminary test of the Main Board which is done before one starts assembly showed it to be failed We tried a number of diagnostics over the phone and finally I had him send the board to me My tests revealed that there was a low resistance short on the 3.3 volt rail I traced the circuit and removed smd components and cut traces to try to isolate the branch of the 3.3 volt circuit and the component that might be causing the problem Ultimately the fault was in the  STM32F103C8T6STM32F103C8T6 microprocessor I removed the microprocessor and decided that the unit was going to be just parts While I can technically replace the uP I have no way to reprogram it As I studied the schematic I noticed that there was in addition to the uP an 8 pin 24LC32A EPROM tied to the SOA and SCL pins of the uP Here is a link to the main board schematic

 

http://www.jyetech.com/Products/LcdScope/Schematic_150main.pdf

 

My question is whether there is a possibility that the program for the unit is on the EPROM and not on the uP. Would I be able to replace the fried uP with a raw one and expect it to automatically boot up from the EPROM.  At this point it is all just a learning experience but I will probably not waste my money on a uP or my time replacing it if it is impossible for the program to be on the EPROM.

 

Any insights will be appreciated.

 

John

 

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  • jw0752
    jw0752 over 8 years ago +8 suggested
    Hi mcb1 Jan Cumps , , gecoz , I want to thank each of you for your awesome response to my question. Based on what you have told me I am sure it will not be as easy as just replacing the uP but your insights…
  • jw0752
    jw0752 over 8 years ago +7
    This is just an update. The STM 32 microprocessor arrived today and I installed it on the board as well as all the parts I had removed to trace the original short. The chip comes with a pre-installed bootloader…
  • mcb1
    mcb1 over 8 years ago +5 suggested
    Does it still have the short. These EEprom do have a supply, and it would be very close to the uP, so it's possible. They usually are a memory for the processor. It will contain some data that is read…
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  • mcb1
    0 mcb1 over 8 years ago

    Does it still have the short.

    These EEprom do have a supply, and it would be very close to the uP, so it's possible.

     

     

    They usually are a memory for the processor. It will contain some data that is read and then used by the program in the uP or stored and read at boot-up or re-boot.

    It would have had to be either preprogrammed or a special program loaded into the processor and then the final version loaded.

    It's possible ....

     

     

    Shorts on the data lines is unlikely to be causing the short you observed.

     

    So time back in the past we had a device that allowed you to inject a signal onto a pcb trace.

    You had a second device that allowed you to probe for that signal.

    I can't recall all the details but the purpose was to trace shorts without resorting to the cut and try method.

     

    Mark

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  • jw0752
    0 jw0752 over 8 years ago in reply to mcb1

    Hi Mark,

    The 3.3 V rail had less than 1 ohm resistance to ground. I removed all the easy stuff and didn't loose the short until I pulled the uP. It is possible that we mishandled it and it got hit with a bit of static. My friend thought that he might have damaged it by using the wrong power supply or by hooking it up backwards. I told him that there was a diode and a voltage regulator that would have protected it from these mistakes. Thanks for your ideas.

    John

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  • jw0752
    0 jw0752 over 8 years ago in reply to mcb1

    Hi Mark,

    The 3.3 V rail had less than 1 ohm resistance to ground. I removed all the easy stuff and didn't loose the short until I pulled the uP. It is possible that we mishandled it and it got hit with a bit of static. My friend thought that he might have damaged it by using the wrong power supply or by hooking it up backwards. I told him that there was a diode and a voltage regulator that would have protected it from these mistakes. Thanks for your ideas.

    John

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