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EV2400: This is my 2nd EV2400 Dead.

JORGE CORADO
Intellectual 350 points
Part Number: EV2400
Other Parts Discussed in Thread: BQ76940, , BQSTUDIO, TPS2113A

The first EV2400 stops working after an accidental short circuit in the BQ76940 eval board (the short was not on the EV2400).

The second one stop working after a disconnect/connect USB cable.

I check my grounds, and I cannot measure any ground loops. I work with several interfaces on my bench, and I never had a problem like this.

I just discover that several people reported very similar issues in previous posts.

Since I spend a lot of money in these tools (($207.00 x 2)+ $260.00 of the eval board), I would like to know:

1. Is there any way to replace or repair this unit (EV2400)?

2. Is there anything that I can do to avoid this problem in the future?

Thanks for your help.

  • 0
    TI__Mastermind 25955 points

    Hi Jorge,

    As for dead devices, could you send me a link to the posts? I'm not aware of EV2400s being 'dead'.  The only instance I'm aware of is an EV2400 failure after damage was seen (big hole in U9 and/or U14) on the board.

    Normally, a 'dead' post is associated with a driver issue.

    As for the USB cable connect/disconnect, please check your device manager to see if there are unknown devices.

    Please download the firmware updater here:  http://www.ti.com/lit/zip/sluc578 which is found on the EV2400 Device page: http://www.ti.com/tool/ev2400

    Install the firmware updater (do not run from the zip archive).

    1. Assuming there is no physical damage, open the unit and connect the jumper shown below, plug in the USB cable to the EV2400 and PC, then remove the jumper.  Now execute the firmware installer with the -s flag (use command line and make sure in admin mode).  The 3 LEDS should illuminate and the 'USB device connected sound' should play on your PC speakers.

    2. Not sure what the problem is.  Let's try to above steps in an effort to determine a root cause.

    If the error persists, please send me a picture of your set up, and examine your EV2400 for any damage that may have been caused by the short.  Please send any debug information possible, such as windows version, bqstudio version, etc...  Please also describe the state of the EV2400.  Can you hear the connect/enumerated sound from the windows system when the device is connected via USB?  Are the LEDS illuminated on the EV2400? What did you short on the other board?

    Sincerely,

    Bryan Kahler

  • 0 in reply to Bryan Kahler
    Intellectual 350 points

    Hi Bryan, 

    Thanks for you response.

    Here you have some links that I found related to EVM2400 issues (similar to mine):

    Lets focus on the unit that stops working after USB connections (NO Short circuit). That unit is showing the following error:

    At the same time, U8 gets extremely hot, and the 3 LED are off.

    Here you have a picture of my setup:

    At this point I cannot send you any bqstudio debug information, since I have no communication.

    I think the key point is U8, which is getting extremely hot.

    Please let me know if you need any other information

  • 0 in reply to JORGE CORADO
    TI__Mastermind 25955 points
    Hi Jorge,

    Please try measuring the voltage between ground on the usb connector to voltage on ground of your load with the EV2400 (with the computer plugged in as tested). Please determine if there is a ground loop issue.

    If you suspect a ground loop is the issue, please isolate the computer by using a laptop that is not connected to a battery charger for the duration of the test (with a working EV2400).

    Please also disconnect the 3.3V wire from the SMBUS connector.

    As for repair, if U8 is too hot, please replace the TPS2113A and any other components downstream that may be damaged.

    If U1 needs replacement, please reflow the part and use the bootloader from this thread to reprogram the device:

    e2e.ti.com/.../716008

    Sincerely,
    Bryan Kahler
  • 0 in reply to JORGE CORADO
    TI__Intellectual 2251 points
    Hi Jorge,

    The first thing you should let EV2400 working. The easiest way is to check the 3 LEDS should illuminate after USB connected.
    It's not relative to bq76904EVM and EVMconnection there. I have some experience that U8 is too hot thus I suspect it's damaged. After replace new one, it's working for me.
  • 0 in reply to Beginner
    Intellectual 350 points

    Hi All,

    Thanks everybody for your help. The unit is working now.

    The following parts were replaced:

    - U1 MSP430F5529IPN

    - U2 RPS2550DBV

    - U8 TPS2113APW

    - U3 TPS76333DBV

    -U9 and U14 ISL9084

    As you can see most of the components receiving 5V from 5V-MUX supply were damaged.

    Now I am using a Laptop (No connected to AC) and so far is working fine.

    Thanks again everybody.