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Tiva Launch Pad gets heated

user4627700
Prodigy 160 points
Other Parts Discussed in Thread: EK-TM4C123GXL

Whenever I connect  power supply to the launchpad, the controller starts getting heated slowly even if I am not running any code.Resistance between +3.3 and GND is about 44 Ohm. When I don't connect H24 & H25 jumper resistance between +3.3 and GND is HIGH as it should be. I think the Problem is on the Debugger side of the board. Somehow H25 is connected to the GND. Please give some ideas/advice how I can overcome this problem.

  • 0
    TI__Mastermind 22580 points
    Which LaunchPad are you using?

    Thanks,
    Sai
  • 0 in reply to Sai Reddy
    Prodigy 160 points
    I am using TIVA C EK-TM4C123GXL.
  • 0 in reply to user4627700
    TI__Mastermind 22580 points
    When you say it is getting heated up, how hot does it get? Is it too hot to touch?

    If yes, then it is a problem.

    If not, then did you try to program the MCU? If you are able to program the MCU, then it might be alright to use it. At this point you can try to get the current consumed by the board to verify if there is indeed a problem or not.

    Also did you get the resistance reading when the board was powered-up?

    If there is indeed a short, not sure how I can help in finding the short between VCC and GND, as it could be anywhere on the board. Best way could be to visually inspect and see if you can find a short. Looking at the layout might help in identifying the potential areas where a short could occur accidentally.

    Thanks,
    Sai
  • 0 in reply to user4627700
    Guru 47900 points

    Might the ever "delightful" resistors (R9 & R10) - which directly tie 2 pairs of MCU pins together - have bitten yet another?

    Should your software employ 2 or more of those pins as outputs - with connected pins driven (one high - mated/other low) the over-current condition you note - may result.

    You provide NO information whatsoever towards your board's history - had it ever worked?    What might (you) have done to cause this issue?

  • 0 in reply to cb1
    Prodigy 160 points

    I have removed R9 & R10 before so no problem with that. I have narrowed down the short on H25 jumper line. Other +3.3V line are OK. Only H25 line is connected to the ground.Without H24&H25 not connected there is not short between +3.3V and GND but when I connect H24&H25 jumper short appears. Is there a way around to power the board without connecting H24 & H25? 

  • 0 in reply to Sai Reddy
    Prodigy 160 points

    Yes, I can program the MCU. After powering it for 30s it gets very heated about 50-100 degree Celsius.