• State TI Thinks Resolved
  • Locked Locked
  • Replies 9 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 234 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MMWCAS-RF-EVM: One of my MMWCAS-RF-EVM suddenly doesn't work

ALFIE ZENG
Prodigy 10 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: MMWCAS-DSP-EVM

I have two  MMWCAS-RF-EVM, the old one was bought in 2021, the new one was bought in 2023.5.19, now the new one didn't work any more.

I am collaborating with MMWCAS-DSP-EVM for data collection, but now it has no response, no lights, and no data output.

And the old one is working normally. The tool I am using is mmwave_ Studio_ 03_ 00_ 00_ 14_ Win32, I can ensure that their environment is the same.

What should I do? Please help me

  • 0
    TI__Mastermind 20605 points

    Hi,

    Here are some things that you can do to troubleshoot:

    • Are you able to connect to the RS232?
    • Is the power supply LED on?
    • Can you probe some points on the EVM with an oscilloscope (primarily power, please refer schematic for this) and see if the right voltage signals are available?

    That being said, you will have to contact customer care for this. I'm not sure this can be debugged and fixed directly unless you are aware of what change caused this issue.

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    Prodigy 10 points

    Hi Kaushik

    Thanks for your reply.

    We did not connect through RS232, we directly linked through the network port. All the LED lights are not on. Last week, we purchased a multimeter to test the voltage on the board.The following image is our test results.

    May I ask if you can provide more suggestions? thank you

  • 0 in reply to ALFIE ZENG
    TI__Mastermind 20605 points

    Hi Alfie,

    I will pass this thread to our EVM expert who can assist you better in this scenario. Please expect a response in 1-2 days.

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    TI__Guru* 91206 points

    Dear Alfie- 

    Can you check that you are providing 5VDC via J6? This is the board is powered and goes on to make 3.3VDC. 

     

  • 0 in reply to Josh Wyatt
    Prodigy 10 points

    Dear Josh

    Thanks for your reply, the voltage we measured is 0.321V.

    Do you have any further suggestions? Thanks very much

  • 0 in reply to ALFIE ZENG
    TI__Mastermind 26985 points

    Hello,

    Have you been using the board in an ESD safe environment? 

    When you say the voltage is 0.321V, is that the voltage you are measuring on the SYSTEM_5V0 supply? If so, it seems like the 5V supply is being pulled to GND due to some kind of failure. Can you measure the resistance between the SYSTEM_5V0 supply and GND to confirm? If the SYSTEM_5V0 supply is shorted to GND it will be very difficult to debug, you would need to individually disconnect each IC that is on the SYSTEM_5V0 supply to narrow down the point of failure. 

    Regards,

    Adrian

  • 0 in reply to aozer
    Prodigy 10 points

    Hi Adrian,

    I‘m sure it was used in an ESD safe environment, because I have two pcs of this board, one of which works perfectly. I measured the voltage on the SYSTEM_5V0 supply according to the suggest by Josh. I just measured the resistance between SYSTEM_5V0 supply and GND, as you guessed, is short circuited. Now we believe that a certain power chip is damaged, but I cannot determine which IC has the problem. This board encountered a problem about 2 months after I purchased it, which means it is still under warranty. I would like to know if TI will provide free repair services for me in this situation?

    Thanks very much

    Begards

    Adrian

  • 0 in reply to ALFIE ZENG
    Prodigy 10 points

    Sorry for my misspelling.

    Begards

    Alfie

  • 0 in reply to ALFIE ZENG
    TI__Mastermind 26985 points

    Hello,

    Thanks for the confirmation. It seems like something on the 5V path has failed. It would be extremely difficult to narrow down and replace the failed component or components, so I think this board needs to be replaced. Can you please follow the return process on the provided link based on where you purchased the board? You can provide a link to this thread during the return process if needed.

    https://www.ti.com/support-quality/additional-information/customer-returns.html

    Regards,

    Adrian