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TMDS64GPEVM: will not power on

Tim Anderson
Prodigy 50 points

Part Number: TMDS64GPEVM

I just recently purchased an TMDS64GPEVM. I was able to connect a 12v supply and boot it yesterday but today it will not boot. also when I flip the power switch it does not light all the rest of the LEDs on the board it did yesterday. LD06, ld21, ld24 all on, no others. switch is in the off state. if I flip the switch no additional leds light.
the Power cord yesterday was loose so I switched to a different supply. but that was after it no longer powered on.

  • 0
    TI__Genius 15910 points

    Hi Tim,

    Sorry to hear you're having some issues with the EVM.  What power supply are you using, and what revision of the EVM do you have?  The EVM revision should be printed on a sticker on the EVM that starts with the text "PROC101." 

    I'm wondering if the loose power cord or switching power supplies could have incidentally resulted in hot plugging the board.  More details are available in the "Important Usage Notes" and "Known Issues" sections of the EVM user guide.

    Regards,

    Melissa

  • 0 in reply to melissaw
    Prodigy 50 points

    I have a 12V 1.5A power supply ADS-18E-12N.  The board is a PROC101A (001)

  • 0
    Prodigy 50 points

    Any updates? I would like either a fix to get it to boot again or a repair/replacement.

  • 0 in reply to Tim Anderson
    TI__Genius 13505 points

    Hi Tim,

    What was the power rating on the other power supply?  We recommend a supply with a higher current rating than the one you have (5A instead of 1.5A), and wondering if the inrush current is putting your supply into protect mode?  Else, as Melissa stated, the loose connection may have inadvertently hot-cycled the power, which exposes a weakness in the power input design of the EVM.

    Can you check if the 12V (TP81), 5V (TP18) and 3V3 (TP44) rails are present (highlighted below)?v  If you have 12V at TP81, but 5V and 3V3 are both dead, then it is likely the U30 regulator was damaged and needs to be RMA'd.  Link is here for repair: https://www.mistralsolutions.com/product-engineering-services/rma-form/

  • 0
    Prodigy 50 points

    I switched to a ps that has 5A, and did the procedure described. the 12V is there but 5V and 3.3V are both dead in both power switch positions. I will fill out the RMA form

  • 0 in reply to Michael Erdahl
    TI__Mastermind 28992 points

    I think the AM64x GPEVM design has flaw, the power circuit is very easy broken. I have several brick boards on hand now.

    We made this change to make the board working again.

    1. Remove U30.
    2. Short TP12 and TP44 to provide 3.3V.
    3. Short TP18 and C66(VMAIN)  to supply 5V.
    4. Supply 5V instead of 12V to board.