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Original question:

TSW14DL3200EVM: Unable to power on board

TSW14DL3200EVM: Also Unable to Power on Board

David Muse
Prodigy 20 points
Part Number: TSW14DL3200EVM

I also experienced a situation similar to [ https://e2e.ti.com/support/data-converters/f/73/p/714726/2638519?tisearch=e2e-sitesearch&keymatch=TSW14DL3200EVM#2638519 ] where the new TSW14DL3200EVM did not appear to power on correctly after following the instructions in the user guide.

The fan does not come on after turning SW2 to the on position and LED D19 does not light when power is applied to the board. Rework to try shorting out fuse F1 may not be possible in my situation.

Are there any known issues with these boards or the user guide instructions?

How was the other related issue resolved?

Thank you in advance for any assistance in getting this board working.

  • 0
    TI__Mastermind 44680 points
    Hi David
    Is the power source connected to the board 12V DC with at least 3A current capability?
    Can you confirm that the supply is connected to give GND on the outer surface of the barrel connector and +12V in the center?
    Best regards,
    Jim B
  • 0 in reply to Jim Brinkhurst1
    Prodigy 20 points
    Hi Jim,
    The power source is 12V DC with at least 3A current capability. GND is on the outer surface of the barrel connector and +12 in the center.

    After inspecting the board more carefully it looks like the pads for reference designator C407 on the bottom of board are completely delaminated and the capacitor is just hanging by the pulled up PCB trace. The board is on standoffs so I'm not sure how damage like that could have occurred here. Please advise. Thanks.
  • 0 in reply to David Muse
    TI__Mastermind 44680 points

    Hi David

    That component being damaged/dislodged could be the cause for the failure to start up.

    If this was a new board and you're sure it wasn't damaged on-site then you should return it for a replacement. The TI Estore return information is available here: 

    If the board was damaged after delivery you may be able to get it working if you can repair that capacitor and the related connections.

    The design information including schematics is available here:

    C407 normally connects from U26 pin 25 (signal net BP6) to ground. In making the repair you will need to ensure the capacitor is connecting from pin 25 to GND, and that BP6 net connects from pin 25 to R285 and R299.

    In addition please ensure that U26 pin 24 (BPEXT) is connected to ground via the 10k resistor R13.

    I hope this is helpful.

    Best regards,

    Jim B

  • 0 in reply to Jim Brinkhurst1
    Prodigy 60 points
    Hi Jim,

    The TSW14DL3200EVM board that David had was sent back to Mouser because it was damaged. C407 was knocked off the board. We then received another board from Mouser and it also had a capacitor knocked off C189. This was also sent back to Mouser. We then ordered another board from DigiKey which appears to have all of the components intact. But when I power it up there's still problems.
    With SW2 in the off position LED D19 is illuminated when 12V is applied. When SW2 is moved to the on position D19 goes off. When I try to measure the over and under voltage while SW2 is in the off postion LED D19 starts to flicker. The voltages at U11.3 and U11.2 appear to be good. I've also tried to vary the 12V supply from 10.5 to 13.5V and still doesn't work. (Users manual says it should work between 10 and 14 volts)
    Note, I'm attempting to bring TSW14DL3200EVM up with only the 12V supply attached.
    Any suggestions?

    Thanks,

    Kirk
  • 0 in reply to Kirk Larson
    TI__Mastermind 44680 points
    Hi Kirk/David
    I'm sorry to hear the problems you've been having getting a good board.
    With the latest board that appears intact, can you try a different 12V supply to see if there is any issue with inrush current related to the one you have been using?
    This shouldn't be the cause since you said it is 3A capable, but I'm not sure what else to try at this point and we should rule this out.
    Best regards,
    Jim B
  • 0 in reply to Jim Brinkhurst1
    TI__Mastermind 44680 points
    Hi Kirk and David
    Have you managed to make any progress with this issue?
    Please provide an update.
    Best regards,
    Jim B
  • 0 in reply to Jim Brinkhurst1
    Prodigy 60 points
    Hi Jim,

    Yes, I've been able to get the board powered by touching the gate of Q10 with a scope probe. The input protection is very sensitive. It keeps cycling off until I put a load on the gate. Looking at the datasheet for LTC4365 (U11) they recommend to use a TVS rather than the diode that's on the board.

    Kirk
  • 0 in reply to Kirk Larson
    TI__Mastermind 44680 points
    Hi Kirk
    I discussed this with a colleague. We haven't had any issues with that power-input circuit on other boards, but will keep an eye out for similar behavior. You could try cleaning that area of the board with an appropriate circuit board cleaning solvent to remove possible contamination causing leakage. That may improve things.
    If you are confident that your 12V source is clean and doesn't have any over-shoot issues you could bypass that circuit by installing a fuse at F1.
    Best regards,
    Jim B