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TMDS243EVM: Initial commissioning not successful

Tommy Beckmann
Intellectual 292 points
Part Number: TMDS243EVM

Dear Ladies and Gents,

I ordered 2 TMDS243EVM from a distributor and one board seems to have an issue with inital startup.

We followed Power-On/Off procedures in chapter 3.3 from EVM Users manual, unfortunately after switching SW1 to ON the board shows no further reaction (LD6 and LD12 illuminates as expected, but nothing more):

The distributor ask me to raise this request - if there is anything else on our side that we can try to do before sending the board back? (We measured already the switch - this is functional)

BTW: The second board works as expected.

Thanks for your support

Best regards,

Tommy

  • 0
    TI__Mastermind 22685 points

    Hi Tommy,

    Are you sure about LD12?  That is one of the Industrial Ethernet LEDs driven by the I2C LED Driver (U34).

    If possible, can you measure some voltages along the power path to see which voltages are as expected, and which ones are not?  I suspect the LM5140 is having issues (we have seen this before on this EVM), but want to confirm.

    VMAIN is connected to the 12V power rail, after the fuse and D3 diode and can be measured at TP81.

    The LM5140 PMIC is powered by the VMAIN 12V rail, and generates the following:

    • VCC_3V3_SYS on SW1, which can be measured on TP44
    • VCC_5V0 on SW2, which can be measured on TP18,

    Can you measure all three of those test points and confirm the voltage levels?

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    Intellectual 292 points

    Hi Mike,

    thanks for the quick reply.

    You are right, it is LD6 and LD24 illuminating when power applies, sry my fault.

    I measured the two voltages:

    * TP44 is constant 0 (independent of switch SW1 position)

    * TP18 same, constant 0

    Does this mean, LM5140 does have a problem? How can we proceed here - is the distributor able to change this IC?

    Thanks and best regards,

    Tommy

  • 0 in reply to Tommy Beckmann
    TI__Mastermind 22685 points

    Hi Tommy,

    Yes, the details you provide are consistent with the LM5140 having a problem and needing to be replaced.

    You can submit an RMA request to Mistral: https://www.mistralsolutions.com/product-engineering-services/rma-form/ and send the board back to them and request they replace the LM5140.  Please note that Mistral is based in India, so there may be international shipping that you should consider.

    Alternatively, if you have the capabilities of replacing the LM5140 device yourself (it is a QFN footprint), we can send you a couple of LM5140 devices and you can replace the device yourself without having to go through the full RMA process.  If you want to pursue this route, please let me know and I'll start this process.

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    Intellectual 292 points

    Hi Mike,

    I checked with Hardwaredepartment - we try to replace it by ourself.

    Can you ship some parts to our office. The address is located in myTI account. If you need further information let me know.

    Best regards,

    Tommy

  • 0 in reply to Tommy Beckmann
    TI__Mastermind 22685 points

    Hi Tommy,

    I don't have full access to your myTI account to pull your address and other information.  I'm going to send you an E2E friend request so we can start a direct message conversation that is private for you to share your shipping information.

    Thanks,
    Mike