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DLP4710LC: Chip damaged

alex.wang
Prodigy 80 points
Part Number: DLP4710LC
Other Parts Discussed in Thread: DLP4710EVM-LC,

We bought one DLP4710EVM-LC and several DLP4710LC chips and found that the chips were often damaged during use.

We developed a new projector with the PCB of DLP4710EVM-LC. In the process of debugging the projector, the DLP4710LC chips will be removed from its mounting structure more frequently.

After about twenty times disassembly, the chips has a high  probability of being damaged. The situation is that after the projector is powered on, it cannot pass the self-test procedure, and the damaged pixels like vertical lines can be seen on the surface of the chip with the naked eye(as shown in the picture below).

We want to know why the chip is easily damaged ?  Does TI have any  suggestions or application guidlelines?

  • 0
    TI__Expert 3905 points

    Hello Alex,

    Welcome back to the E2E forum. Thank you for your continued business!

    The DMD has very delicate pins where it attaches to the interposer. When the DMD is removed, the likelihood of bending or misaligning the connections between the DMD and interposer is very high. The damaged connection causes the vertical lines you are seeing. We do not recommend removing the DMD from the interposer unless absolutely necessary.

    Best,

    Maxine

  • 0 in reply to Maxine Cabrasawan
    Prodigy 80 points

    Hello Maxine，

    Are there any guideline documents for users?  In this way we can learn more details about the precautions.

    Best,

    Alex

  • 0 in reply to alex.wang
    TI__Mastermind 23040 points

    Hello Alex,

    These are permanent damages to DMD mirrors. The common cause of such damages are noise or loose connection to DMD, please avoid following to minimize such damages:

    1. No Hot plug or unplug - The system should be properly powered down. Unplugging system while it is working will cause such damages. Please ensure that DMD is completely powered off before unplugging or connecting.

    2. Loose connection - Please ensure that all cables are properly secured before powering up system. A loose connection will cause noise in the signal which will lead to such damages.

    3. Ensure signal and voltage lines do not have ringing / noise on them  

    regards,

    Vivek

  • 0 in reply to alex.wang
    TI__Expert 3905 points

    Hello Alex,

    Yes, the DMD Handling Specifications Guide can be found here. Please let me know if you have any more questions.

    Best,

    Maxine