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DLP4500: Green LED not shining

Emilie Cuillery
Intellectual 305 points
Part Number: DLPLCR4500EVM
Other Parts Discussed in Thread: DLP4500, DLPLCR4500EVM, DLPC350

Hi, 

I use my DLP4500 LightCrafter EVM to trigger my camera. I have wires connected from J14 > BNC > Amplifier > BNC > camera. My setup is on an optical table. It appears that if my BNC end enter in contact with my tables, the lights turn off and disconnect from the GUI. This happened a few times.. and what I would do is to take the bnc to my hand for a second and the EVM would light again. So I isolated my BNC cables. But accidentally when changing the setup to a new camera one BNC end slipped to the table... I tried to ground it, to unplug and plug again everything, to restart computers, to uninstall USB controllers... but now my projector cannot turn on anymore. When I plug the EVM (I use the charger sold with the projector) the fan goes on, but the green LED no top STAYS OFF and nothing is displayed. The EVM is not recognized by the computer and does not connect to the GUI.

Can I do something to troubleshoot ? Can I reboot ?

Thank you SO MUCH for your support :) Any help is appreciated since I am now stuck with all my experiments....

Emilie 

  • 0
    Intellectual 305 points

    Edit: part number = DLPLCR4500EVM (sorry for the mistake) and also the light under the board is green.

    Additionally, could it be this a firmware crash ?  https://e2e.ti.com/support/dlp/f/94/t/541839?DLP-Lightcrafter-4500-Firmware-crash

    Thank ;)
  • 0 in reply to Emilie Cuillery
    TI__Intellectual 1825 points

    Hi Emilie, 

    Thanks for your post and interest in DLP! I'm sorry to hear you're having trouble getting the DLPLCR4500EVM to turn on. 

    Unfortunately, I think an IC on the board may have been destroyed in the last incident as a status LED is not turning on and you cannot connect the EVM to your computer. Have you tried to probe some test points to check the voltages? 

    Can you tell me which status LED on the board isn't working? I will try to take a look at the schematic and determine which IC may be causing the problem. Sometimes, even replacing damaged components sometimes doesn't fix the EVM when a short occurs. 

    I believe the fastest way to get your experiments up and running again would be to replace the PCB or get a new EVM, but I'm happy to help you try to isolate the issue to a single IC.

    Thanks, 

    Brandon

  • 0 in reply to Brandon Seiser
    Intellectual 305 points

    Dear Brandon,

    Thank you for your support. The green LED that does not turn on is the D4 LED (the one on top of the board next to the mini-usb port, the one circled in red on the picture). And when plugged, the green LED under the board next to the flex cable stays on.

    Which test point do you suggest I probe ? My electrical engineering background is not very developed unfortunately. 

    Also, in a case of a destroyed IC, is it then possible to order a new one ? Or should the entire board be changed ?

    Please let me know if I can give you more information that could be helpful

    Thank you again, Emilie 

  • 0 in reply to Emilie Cuillery
    TI__Intellectual 1825 points

    Hi Emilie, 

    From looking at the schematic, this LED is tied between the 3.3V supply and the DLPC350 heartbeat pin. Can you please try to probe the 3.3V supply on the board? You should find a marking on the silk screen labeled P3P3V.

    Thanks, 

    Brandon

  • 0 in reply to Brandon Seiser
    Intellectual 305 points

    Dear Brandon, 

    Unfortunately I do not see any "P3P3V" text on the board...Do you have a plan of the board on which you can show me where it is ?

    But I can see a few test points TP53, TP48... Maybe you have a list of the test points I can measure (and what I should obtain) to help you for the troubleshooting?

    Thank you for your time, Emilie 

  • 0 in reply to Emilie Cuillery
    TI__Intellectual 1825 points

    Hi Emilie, 

    Can you please probe pin 3 on J31? This pin is connected to the 3.3V supply. J31 is a 9 pin connector.

    Thanks, 

    Brandon

  • 0 in reply to Brandon Seiser
    Intellectual 305 points

    Dear Brandon,

    Pin 3 of J31 gives 3.3V output. Seems fine. Do you have further instructions ? :)

    Thank you very much again for your commitment

    Emilie

  • 0 in reply to Emilie Cuillery
    TI__Intellectual 1825 points

    Hi Emilie, 

    No problem! I am happy to help!

    Because the 3.3V supply seems to be working, I believe the short caused damage to the DLPC350 controller. The DLPC350 controller has a pin called "heartbeat". If the controller were functioning properly, the LED between the 3.3V supply and this pin would be blinking. I was hoping there was an issue on the 3.3V supply, as this could mean the controller was still functional. 

    However, because the supply is fine, something damaged the controller. To proceed you have two paths:

    1. Replace the DLPC350 controller. However this may not make the EVM operational, as other components may be damaged. 

    2. Replace the DLPLCR4500EVM.

    I'd recommend replacing the EVM if possible, as I've seen other users struggle to replace comments. I wish there was a better way to get your issue fixed faster! Please let us know if you have any questions!

    Thanks, 

    Brandon

  • 0 in reply to Brandon Seiser
    Intellectual 305 points

    Dear Brandon, 

    Thank you very much for your input. I believe option 2 is indeed the best for fast resolution.

    And, for the broken EVM, does TI eventually offer after-sale service such as full board checks in order to identify exactly which parts are damaged to be able to fix the board? Being environmental conscious and curious, I always think that things can be fixed... Or a recycling service ?...

    Thank you for your reply and the help you provided, 

    Emilie

  • 0 in reply to Emilie Cuillery
    TI__Intellectual 1825 points

    Hi Emilie, 

    Unfortunately, TI does not offer an after-sale service to fix damaged boards or a recycling service. I would recommend taking the board to any local shop that recycles electronics.

    Thanks, 

    Brandon

  • 0 in reply to Brandon Seiser
    Intellectual 305 points

    Hi Brandon, 

    Very well thank you for your answers. Have a nice day, Emilie