DLP4620SQ1EVM: Power up issue

Hello Myungjin,

Sorry for the delay.  This weekend was a long holiday weekend here in the United States.  I have assigned this to the correct team  They should reply on Monday United States time.

Fizix

Hi myungjin song,

May you please take a picture of your set up for one of these EVMs?

Please also disconnect the HDMI cable and use the baseline firmware that comes with the EVM so that we can rule out any SW being the issue.

Where are you applying power to the board (which connector)? How much voltage are you biasing the EVM with? I see you have 6V as one of your measurements. The EVM runs off a 12VDC input from the illumination driver, which then connects to the controller board. TI recommends a DC power supply that can supply up to 60W of power (12V, 5A).

Here is a block diagram from the User's Guide.

If you are already doing the above, then may you please send us the power up measurements of your EVM? This will be more than one measurement per EVM assuming you do not have an oscilloscope with more than 4 channels. Please follow the power up sequencing listed in the TPS99000S-Q1 datasheet, as you have hinted at doing already.

You may send files on E2E (such as a zipped archive) if it makes it easier to send images in bulk rather than one at a time. Please just separate into folders and ensure the EVM numbers still match with the ones above.

Regards,
Michael Ly

Hello

I attached proj_on and en 1v1 about first board. 

I think proj_on is good, but en 1v1 is not output.

Yellow is proj_on.

Pink is en 1v1.

Oddly enough, the second and third boards work fine again.

Hi Myungjin,

May I please get answers to the following?

1. A picture of your setup
2. What are you using as your power supply?
3. What voltage are you using, and what is the power supply's current capability?
4. Do you have access to the alternative power supply input in case one of  them is not working as intended? The DLP4620SQ1EVM should have a barrel jack input 12V input as well as a 4-pin 12V connector so the user can use  either one. Which one of these are you currently using? This helps rule out a faulty power input port.
   
5. Have you attempted to use a different power supply rather  than just the port shown above? This helps rule out faulty power supplies.

May I please see your scope shots of Boards 2 and 3? I would like to see if those have excessive ripple  that causes them to sometimes fail and sometimes pass power-up. This is behavior I would not expect, and I'd like to make sure you have well-working, reliable boards. Thanks!

Regards,
Michael Ly

1. i didnt take picture my setup at that time.
2. I used power supply. model is LW-K3010D.
3. 12V, 6A
4. In this test, i used 4 pin connecter with power supply.
5. Usuaally i used to use power adapter. it was 12V, 19V.

Hi Myungjin,

Thanks for the answers. Are you certain that there isn't a voltage droop with your power supply? Please measure the input voltage during power up of your EVM. There is a chance that the power supply is not able to handle the inrush current, causing the voltage to sag.

myungjin song said:

Oddly enough, the second and third boards work fine again.

Did you change anything for these two to work again, such as which power supply you were using? Cable? Any board configurations? Software? Please make sure all boards run the same exact firmware, making sure the firmware uploaded is the baseline project that is uploaded to the EVM on purchase.

Have you tested both the DC power supply unit as well as power adapter for all three boards? Please produce a table showing what has been tested with what and the results, preferably testing at least 5 times each to ensure repeatability.

What model is your power adapter? I do not understand what you mean by 12V, 19V? Are you saying you used two different ones? 19V would overvoltage the DLP4620SQ1EVM, which is only tolerant up to 18V. Have you accidentally used 19V at any point?

Are these boards related to the other E2E thread you have listed here with V_ORB? I wonder if the power supply is related here.
https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/1496578/dlp4620sq1evm-firmware

Please take a picture of your set up(s) so I have a good idea of what is going on.

Regards,
Michael Ly

what is same exact firmware?

I tried 5 times as below. it showes same result. 

Did you change anything for these two to work again, such as which power supply you were using? Cable? Any board configurations? Software? No. nothing.

Have you tested both the DC power supply unit as well as power adapter for all three boards? yes same as power adapter and power supply. 

I usually used 12V adapter. but somtime i used 19V adapter. 

I measured in the same environment as the thread in question.

please let me know email address to send you test envoronment. 

Due to company security policy, I cannot upload files.

Hi Myungjin,

Thanks for the detailed table. I've already sent you a friend request on E2E if you could please accept it? I would prefer to share my email via private message rather than on the public forum. Thank you.

Have you checked to see if your TPS99000 is receiving power adequate power? I would also probe the V_MAIN resistive divider node that the TPS99000S-Q1 uses.

I would suggest you only use up to 18V for your input voltage, as the user's manual clearly states an input voltage max of 18V.

myungjin song said:

what is same exact firmware?

Sorry if the wording was confusing. By this, I mean do all three boards use the same firmware? There are no differences between the three firmwares you have uploaded? And are all three firmwares the same one that the board came shipped with?

Also, has Board 1 ever been used with 19V power supply? Was Board 1 also the one that had the loose cable connection to power that caused programming to fail in the other thread? Please let me know.

Regards,
Michael Ly

Regards,
Michael Ly

I missed inrush current results.

3rd board 

1st board 

Hi Myungjin,

I replied in our other thread to see if we can start planning on a video call to see if we can debug this in real time. I think this would be much faster. I've also reached out to one of our field applications engineers in Korea for additional input.

Regards,
Michael Ly

Hi Myungjin,

Thanks for the update. I'll mark your answer as resolved. It appears swapping the TPS990001 solved the issue from a previously malfunctioning or damaged IC.

Regards,
Michael Ly