DLPDLCR2010EVM: DLPDLCR2010EVM-PCB

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Replies: 20

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Part Number: DLPDLCR2010EVM

Hi, 

I have DLPDLCR2010EVM-PCB. Before powering it up, I detached the upper board "DLP board" and connected a 5V, 3A adapter to the board. Only one LED was on "SYSPWR". However, I noticed that U12, U9 and U1 were getting very hot. Hence I disconnected the power and found that U9 looks burnt (I am not sure). measuring the resistance between the positive and negative pins of the input, I found it 6 Ohms. This means that there is a short circuit somewhere. To measure the powers, I had to connect the power again and remove it within few seconds to avoid the heat. The measured voltages were: 
U1 = 1V6

U12 = 1V8

U17 = 0V8

As you can notice, these numbers are not as expected from the schematics. Do you have any suggestion? 

It was the very first time to operate the EVM!

Kind regards,

Anas

20 Replies

  • Hello Anas, 

    This typically happens if an input voltage is getting applied to the EVM which is above 5V or a short of the 5V has occurred on the board. 

    The only way to recover from that is to start replacing parts which are connected to the 5V rail and remove the short to GND this way. 

    Best regards,

    Nadine 

  • In reply to Nadine Estermann:

    Hi Nadine,

    Many thanks for your reply and your guidance.

    Due to some time limitations, I had to operate another brand new EVM I had. Using "PW172KB0503f01" as a power adapter, the main board seemed to work properly alone. Once the DLP board was attached, DLPA2005 blew up and there was some smoke. Any idea why this happened? 

    Kind regards,

    Anas

  • In reply to Anas Gasser:

    Hi Anas, 

    Did you have an optical engine with LEDs connected when operating the board?

    Thanks, 

    Brandon

  • In reply to Brandon Seiser:

    Hi Brandon,

    No. It was just the DLPDLCR2010EVM-PCB.

     

    Regards,

    Anas

  • In reply to Anas Gasser:

    Hi Anas, 

    That would do it! The DLPA2005 board requires an LED load to operate properly. The EVM should not be oeprated without an optical engine with LEDs attached. 

    Thanks, 

    Brandon

  • In reply to Brandon Seiser:

    Hi Brandon,

    Thanks a lot for the reply. 

    In fact, I will not use the board as a projector. Instead, I will use it to build an optical system which does not require any LEDs. Do you have any advice for that?

    Otherwise, I will have to connect the LED loads without using them.

    Many thanks in advance.

    Kind regards,

    Anas

  • In reply to Anas Gasser:

    Hi Brandon,

    Another question, am I expected to connect a light sensor to J4? 

    Kind regards,

    Anas

  • In reply to Anas Gasser:

    Hi Anas, 

    For correct operation of the DLPA2005, LEDs are required. One way you may be able to not have LEDs connected would be to connect diodes with similar characteristics instead of the LEDs. We have not tested this, as we always have LEDs connected. 

    As for J4, a light sensor is only required if you would like to use the white point correction feature.

    Thanks, 

    Brandon

  • In reply to Brandon Seiser:

    Hi Brandon, 

    I was checking the schematics of the DLPNIRNANOEVM and I noticed that for DLPA2005, pins 37, 38, 39, 41 and 42 are not connected to any LEDs. These are typically the pins that power the LEDs up in the DLPDLCR2010EVM-PCB. Hence, I am afraid that connecting these pins to LEDs will not solve the problem. I did not try to power the board on as I am afraid that the new DLPA2005 would blow up again!

    Thanks for your help.

    Kind regards,

    Anas 

  • In reply to Anas Gasser:

    Hi Brandon, 

    I replaced the DLP board with a brand new one then connected the LEDs as recommended to J2. The board works now and LEDs D15, D16, D5 and D7 turn on when the board is live and the projector is on. However, after connecting the board to my PC, the provided GUI tool recognized DLPC3430 as shown in the attached file but did not recognize either the DLPA2005, EVM software or the EVM firmware. Will it be possible to fix that?

    Thanks in advance.

    Kind regards,

    Anas