DLP4710EVM-LC: Press the SW21 switch button, the board responds, but the projector cannot be turned on

Dear Technical Support,
Seems like similar problem here.

Please verify for DLP4710EVM-LC and provide guidance for proper operation.
Or confirm if can be considered as defective ?

INV#79970586 595-DLP4710EVM-LC 1PC (Datecode 2312)

CUSTOMER WOULD LIKE TO KNOW WHAT COULD BE THE CAUSE OF THE ERROR.
POWER SUPPLY THEY USE IS "DC power supply (19 V DC, 4.74 A)"

ISSUE: DLP4710 Light Control EVM does not start properly after power on.
Specifically, the device works up to 2 in the attached image, and D43 and
D57 light up, but then when switch (SW21) is pressed, D56 lights up for a
second but the LEDs are not illuminated.

Background: The device froze in the middle of operation, and when SW21 was
pressed, the RGBLED irradiation was not completed.
Since the device was not responding, we restarted the power supply, which
resulted in the above symptoms.

Per customer, they checked the below user guide.

www.ti.com/.../dlpu079a.pdf

Regards,
Manuel

(S/O#269526 / DLP4710EVM-LC operation problem)

I'm facing this EXACT same issue. Same symptoms and everything, out of the blue.

Hello Aydin, Manuel,

Thank you for reaching out through E2E!

I'm contacting my team and will try to get additional information on this as I have not seen this issue personally.

Could you please advise what version of software you are running with the EVM? Also, are you still able to communicate with the module through the GUI?

Best,

Aaron

Dear Technical Support,

The version of EVM software is 4.4.0, the version of EVM firmware is 8.1.0,  the version of  GUI software is 3.2.0.6, and I'm unable to communicate with the module through the GUI.

Regards,
Luo

Hello Luo,

Could you please try and change the settings of 'Display' to a Test Pattern (try something like Solid Color - Cyan or something similar) and perform a 'Set'.

If you have an error please send a snapshot of what that error is as well as a capture of the 'Debug' and 'Command Log'.

Thank you!

Aaron

Hi Aaron,

Thanks for the verification.

The version is 3.2.0.6. Even if GUI is used, it is not possible to communicate with the module, encountered error when try to get into the screen. The power is not supplied to EVM and it does not seem to start.

Regards,

Manuel

Hi Aaron,

Thank you for the verification!

In the first step, we move the SW28 (PS_ON/OFF) switch to the ON position, and LEDs D43 (+3.3V) and D57 (INTZ) light up, as shown in Figure 1 in the corresponding 'Command Log' screenshots.

In the second step, we press the SW21 switch, but LEDs D36 (SYS_ON-OFF), D33 (M_IRQ), and D34 (S_IRQ) do not light up. The corresponding 'Command Log' screenshots are shown in Figure 2.

In the third step, we click 'Information' -> 'Get'. The GUI outputs an error because the second step failed.

Therefore, we are unable to change the settings of 'Display' to a Test Pattern (e.g., Solid Color - Cyan or something similar) and perform a 'Set'.

Regards,

Luo

Can confirm the above doesn't work either, cannot see system settings, perform a set operation.

It seems this issue is occurring for many people, is there a fault in the product?

Hi Aaron,

Thanks for the guidance. Please refer below and advise.

1. The power supply is correct as you said. Tried a different AC adapter, but it did not work

2. Followed the instructions to update the firmware again, but the operation did not change

3. Measured the voltageTP148 highTP264 lowTP182 lowTP182 low _TP183 high Compared to Figure 7-1, the behavior was quite different.

Regards,
Manuel

Hello Manuel,

Understood, thank you for investigating these options as listed.

Please note that you should be seeing the PROJ_ON (TP264) low until you depress SW21, and between SYSPWR and PROJ_ON should have a gap of at least 5ms.

Everything after PROJ_ON should be automated and this is where we can start comparing the next state.

Please advise when the sequence is broken with a scope shot of the unintended behavior.

Thank you!

Aaron

Hi Aaron,

Please verify below/attached update.

Measurements were taken according to the instructions and summarized on the slides.

The following abnormalities were confirmed.

 TP182 and TP183 become high even before SW21 is pressed. (They become high only when SYSPWR is turned on.)

TP185 does not become high even if SW21 is pressed.

DLP4710EVM-LC_oscilloscope_.pptx

Regards,
Manuel

Hello Manuel,

I appreciate that you provided this for us.

I am discussing this with my team, please give me a day to discuss this internally.

Thank you!

Aaron

Hello Manuel,

My team has confirmed that the core voltages as you've found in your PowerPoint do not gate the operation of the PMIC (DLPA3005). The power-up sequence is more accurately shown as below:

Please note the sequence is reflected to be in this order:

1. SYSPWR (TP148)
2. SUP_5P0V (TP182)
3. SUP_2P5V (TP183)
4. PROJ_ON (TP264)
5. PWR_5P5V (TP185)
6. DRST_5P5V (TP160)
7. etc.

Please continue testing in reference to PROJ_ON to the below power sequences.

Best,

Aaron

Hi Aaron,

Is it possible to check further ?

Verification result as below.

      Before: when the switch (SW21) is pressed, D56 lights up momentarily but no LEDs are illuminated.

      After: Nothing happens when the switch (SW21) is pressed.

Regards,

Manuel

Hello Manuel,

Could you share what image file have you loaded into your system during step 4?

Best,

Aaron

Hi Aaron,

Still requesting for the image file, apology for the delay.

Will share as soon as received.

Regards,

Manuel

Hey Manuel,

Understood, I will continue to wait for your information.

Additionally, I assume the others on this thread have come to resolution unless anyone responds.

Best,

Aaron

Hi Aaron, thank you for patience answering/clarifying the concern. We can close the portion I posted. Not sure but our customer had just withdrew the request. So I too will consider as completed. Could be that our customer is now able to resolve through the above updates. Thanks a lot and appreciate the guidance provided.

Regards, Manuel