Other Parts Discussed in Thread: DLPC900
Hi Experts,
Good day! We need your full assistance on this matter. This is related to the previous post: DLP6500FYE: EVM not working - DLP products forum - DLP®︎ products - TI E2E support forums.
The problem is that the DLP Lightcrater 6500 EVM is not connecting with any PC.
If powered up, when connected to the DLPLCR65EVM, the DMD reproduces the pre-stored patterns finely, however, the status in the DLP Lightcrafter DLP900 GUI (5.0.0) remains Disconnected. On the Lightcrafter board, the D8 and D9 LEDs are on and D6 is blinking, as should be. The firmware was updated very recently (not even a week before the issue) to the 6.0.0 version. I'm working on Windows 11, and I stress that the device manager doesn't recognize any device (known or not) when the board is plugged in.
Checks I did:
- Many different configurations of USB cables and laptops, produce the same connection failure
- Uninstalling and reinstalling the GUI software doesn't solve the issue
- The HDMI ports are detected by the PC as an external plug-and-play monitor
- Disabling all the I/O trigger jumpers (J19, J21, J22, J25) with the board powered off doesn't solve the issue
Checks requested by you in the old case.
- The USB connector doesn't present burns, lifted coppers, or any damage, as the rest of the board
- The pins of the USB port are connected to the DLP900 (2-C5, 3-D6 in particular)
- Pictures and schemes already requested are attached to the previous case
You also suggested trying to reload the bootloader of the DLP900, since you suspected "that the section of the bootloader that instantiates the USB interface is broken or the port itself is broken". I am currently not able to reload the bootloader because the JTAG programming tool is not working on any laptop I tried (error due to incorrect side-by-side configuration). Nevertheless, I did a couple of additional checks:
- The voltages on the differential pairs of the USB port (R63 and R64) are always 0V no matter what configuration is used (USB connected/disconnected with the board powered on/off)
- I checked the master debug (J6) output using a serial monitor (at 115200 baud), which gives the following log (note that the errors in the last rows are there because the DLPLCR65EVM was not connected via the flex cable)
Bootloader Version 4.1.0
Jumping to application ...Debug opened on URT0
Memory test cc = 1
API version: 06.00.00
App version: 06.00.00
Configuration layout versions:
Seq Map: 90.00.0000
SW Map: 90.00.0000
I2C Cmd Slave Address 34
digcontrol_init complete: 1
thinapp : Goto State : 2 0
DRAM memory pool 004025E8 200025E8
Autolock initialization passed
Picture Control: Default System Mode 0
thinapp : Display mode 1 0
Displaying Video Curtain...
Illumination: Transition to operating mode
DMD comm error in DMD_Power()Illumination: Disable Illumination
Illumination: Transition to Standby Mode complete
From the log it seems that the DLP900 is working fine and the bootloader runs correctly. However, the connection problem persists. Since we always used the DMD with a laptop (with power supply not grounded), would it be possible that a voltage surge (or any instability) has caused damage to the DLP900 USB sectors? Would you recommend a desktop PC for future applications? We noted that there isn't any protection circuit between the USB port pins and the DLP900 (in particular resistors R86 and R85 are not installed!); would you recommend modifying the board, and adding such a feature?
Note that we already damaged two boards (probably) this way, so any help from you would be precious.
Thanks for your help,
Best regards,
Jonathan