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LAUNCHXL-F28069M: power up issue in LaunchXL-F28069M

Vigneshwar V
Prodigy 180 points
Part Number: LAUNCHXL-F28069M


I have F28069M launchpad, it was working fine initially and i was able to code without any issue. Now when i try to dump code in matlab it gives me error saying XDS100 not powered up. I noticed when i connect the board D4 and D1 power ups properly, but after sometime  D10 blinks once and immediately D1 and D4 led brightness reduces. So i checked the 5v and 3.3v supply using multi-meter and both were showing 1.7v. 

I have also attached video for your reference.

  • 0
    Guru 30330 points
    Hi Vigneshwar,
    It is clear that your board has been damaged. As you have seen, your power supplies are not properly outputting the correct voltages.
    I would recommend finding the damaged part. You can use your handheld DMM to measure for shorts and damaged components. You can also try to power the device using an external power supply. This might help you figure out if your on-board regulator is the culprit.

    If the MCU is hot to the touch, it may be damaged as well.

    If you find components that are damaged, you can attempt to replace them. Otherwise, you will need to purchase a new board.

    Regards,
    Mark
  • 0
    Mastermind 6460 points
    Hi Vigneshwar,

    When you worked with board without problems was it through MATLAB?
    If not, could you consider going back to the source(ccs?) from which you could properly program it and see if it is still consistent and working?
  • 0 in reply to venkatesh chilapur
    Guru 30330 points
    Hey there Vigneshwar,

    Have you been able to resolve your issue? Were you able to pin the failure down to a damaged component?

    Thanks,
    Mark
  • 0 in reply to Mark Labbato
    Prodigy 180 points

    Hello Mark

    Sorry for late reply. When i removed JP1 and JP2 the D4 led blinks proper but when i connect JP1 and JP2 the D4 and D1 blinks brighter for a second, then D10 blinks after this D4 and D1 goes low . So i concluded there is no problem in XDS100 side and problem is the microcontroller side . But after a day i tested the board it worked fine with JP1 and JP2 where i haven't changed anything.

    I don't know what made by board to work fine, i was surprised to see my board working.

    But i see the same problem in another launchxl f28069M board, even in this board xds100 is working fine without JP1 and JP2. I am trying to solve this issue from past 3 days. It would be helpful if you provide me steps to be followed to debug the problem.

    Thanks

    Vigneshwar

  • 0 in reply to Vigneshwar V
    Guru 30330 points
    Vigneshwar,

    This sounds like a very interesting problem. Having inconsistent behavior tells me that there may be some HW issue.

    i cannot read the revision of the board. what revision is this?

    Have you tried the following configuration:
    1. Remove JP1, JP2 jumpers.
    2. Connect XDS100 to PC.
    -> does CCS detect the debug probe?
    -> measure 3.3V and 5V voltages on debugger side of isolation, are they correct?
    3. provide 3.3V to MCU side (on J9, or the boosterpack headers)
    -> measure voltages on MCU side. are they correct?
    -> attempt to connect to MCU with debugger
    -> load code onto MCU, will it execute?

    During a board failure mode, does the MCU become hot to the touch? This could indicate that there is damage on the board. As mentioned in my previous message, you need to comb through the board with a handheld multimeter and check that voltages at various points are correct and that there are no shorts anywhere that could cause an issue. I wouldn't necessarily rely on the LEDs to tell if the board is working fine. Even though an LED is lit, you may not be able to connect to the device, so I would check into that.
  • 0 in reply to Mark Labbato
    Prodigy 180 points

    Hello Mark,
    1. Yes. I have removed the jumper JP1 and JP2 . The XDS100 is detected by my PC. The 3.3V and 5V on the debugger side shows proper voltages.

    2. When i provide external 3.3V to the MCU, the power goes down on the MCU side after 10s.

    During the board failure the MCU becomes hot. Initially the voltage is 3.3 when i give the supply , but as the device fails down, the voltage is reduced to 1.7V. 

    What is the probability of the MCU getting spoilt ?

  • 0 in reply to Vigneshwar V
    Guru 30330 points
    Vigneshwar,

    It would appear that the device may be damaged. You have really three options:
    1. Do further analysis on the device side of the LaunchPad, look for any other shorts between 3.3V and GND. If it is a resistor, capacitor, or other IC, replace it.
    2. Assuming no passive components are damaged, replace the F28069M device.
    3. Purchase a new LAUNCHXL-F28069M.

    The easiest thing is to purchase a new board (#3), but if you have the proper tools, replacing the F28069M could be a first (and cheaper) step.

    You have mentioned that this problem has appeared on multiple boards. If this is true, I am concerned that you are not properly handling the boards, or possibly stressing them beyond operating conditions. Either of these may result in damage to the components on the board. Please use safe handling procedures and ensure that you are not stressing the device beyond it's operating conditions.

    Here is a great resource in learning about ESD safe handling procedures: www.esda.org/.../

    Thanks,
    Mark