DLP6500FYE: DMD has no display, the signal connection is correct

Hi Byron,

There is a UART port on board. Use Pin J6.2 to see UART debug messages.
Please provide a log of that after power cycle.

-ykc

Also in your schematics please check SSP0_TXD and RXD
Looks like Controller TXD is connected to DMD TXD
Its should be Controller TXD - DMD RXD
Controller RXD - DMD TXD

-ykc

The connection here is correct，both the DLPC900 and the cable are Pin to pin connections, and line-order switching is performed on the DMD side.

-Byron

Please provide uart debug output and check for various DMD voltages.

-ykc

Ykc

VOFFSET: 8.41 V

VRESET: -9.99 V

VBIAS: 16.18V

Looks normal.

Debug information for a while.

ykc

No information is output from the uart, and no information is captured using the oscilloscope.

Byron

That's not possible if GUI is able to talk to controller and controller is running. Please share GUI snapshot when controller is connected to PC.
Please Use USB-UART device to connect to uart tx pin of controller board and use teraterm on PC to log these messages.
It prints SW version , DMD type etc.

-ykc

ykc，

My mistake, the serial port tool has a problem, I changed the new one.

The following is the startup log：

【2018-11-24 10:27:09:941】Bootloader Version 3.0

Jumping to application ...

Debug opened on URT0

【2018-11-24 10:27:09:947】tion layout versions:

    Seq Map: 44.21.0100

    SW Map: 44.21.0000

【2018-11-24 10:27:09:951】W Map: 44.21.0000

【2018-11-24 10:27:10:006】I2C Cmd Slave Address 34

【2018-11-24 10:27:16:420】DRAM memory pool 004025E8 200025E8

【2018-11-24 10:27:16:850】ptn_seq.c (1014) >> Failed

Illumination: Transition to operating mode

【2018-11-24 10:27:16:981】 Configuring LED Enable and PWM Driver...

PWM Driver initialized...

Setting PWM Drive Levels...

Controller Product ID: 06

DMD Type: 51

DMD Product ID : 152

System Mode: There are 1 defined System Modes

System Mode: System Mode 0 supports 2D

Sysmon: Executing Default Batch file

GUI snapshot：

this is power on

this is on fly download pic

Ykc

Additional test information: DADSTRB has no output signal (oscilloscope)

Byron

Hi Byron,

From log it seems clear that SCP interface is working fine. Controller is able to detect DMD. I have sent you a message in private.

-ykc

ykc

Thank you for your patience, we may need more digging.

I think the probability of signal integrity is relatively small.

Byron

ykc

ok,The new cable is coming back soon ，I will update the status here.

I have a new question, can I Invert the LED_EN?

Hi ykc,

Thank you for your reply,I will send you a private message.

I just need to test it now, and It's not bad to think about it when you release new firmware.

Byron

Ykc,

The new FPC has come back,The test results are good.Thanks to your support before.

The official FW can be used, but LED_EN still needs to be inverted.

So still need to trouble you again. I have sent you a message in private.

Byron