AM625: am62 custom Board, LVDS Setting Issue

Oh Sangbong

Part Number: AM625
Other Parts Discussed in Thread: SK-AM62B-P1

hello

On the am62 board made with the cusom board, only the following LVDS-related recognition commands are displayed.

With the same code, SK-AM62B-P1 is recognized by the EVM.
As in the circuit below, there are no I2C to I/O ports. Could it be that High is entered in the TS_INT#(U70, 23Pin, Port26) signal, like a conditional statement related to LVDS?

Please reply after confirmation.

over 2 years ago

0 Kallikuppa Sreenivasa over 2 years ago

TI__Guru**** 225785 points

Hello Oh Sangbong,

Thank you for the query.

I need additional information on the issue and also the information on how you have made the connections on the custom board ?

Regards,

Sreenivasa

0 Oh Sangbong over 2 years ago in reply to Kallikuppa Sreenivasa

Prodigy 250 points

Hello

LCD Name is NJ070NA-23.

The connector circuit is as above and the voltage is as required in the datasheet.

For LCD, we will provide data sheet pin information.

LCD Connector Circuit is below.

And we are currently checking without connecting the LCD.
In the EVM, the LCD is not connected and the LVDS device is detected, but the LCD is not detected.

thank you

0 Kallikuppa Sreenivasa over 2 years ago in reply to Oh Sangbong

TI__Guru**** 225785 points

Hello Oh Sangbong,

Are you testing on the EVM or custom board.

if it is custom board, how is the LCD connected to the SOC?

The 2 connector pin diagrams do not match.

Regards,

Sreenivasa

0 Oh Sangbong over 2 years ago in reply to Kallikuppa Sreenivasa

Prodigy 250 points

In evm, you are simply trying to check LVDS activation by uploading the same code,
We are trying to connect the custom board directly to the LCD attached above.

I think the part that is activated with the same code only on the EVM is probably due to the presence of the surrounding circuitry. There is no I2C I/O Expander.
I think it needs to be modified. Please check.

thank you

0 Oh Sangbong over 2 years ago in reply to Oh Sangbong

Prodigy 250 points

In the DTS settings, I left only channel 1 to be used and discarded the rest as unused, so the screen was implemented right away.

If there is any additional unused information, please check.

0 Kallikuppa Sreenivasa over 2 years ago in reply to Oh Sangbong

TI__Guru**** 225785 points

Hello Oh Sangbong,

Thank you.

Oh Sangbong said:
In the DTS settings, I left only channel 1 to be used and discarded the rest as unused, so the screen was implemented right away.

Please elaborate. What do you mean by channel - are you using single link?

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa over 2 years ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 225785 points

Hello Oh Sangbong,

Please refer below link if it helps.

(27) SK-AM62B: AM62 LVDS panel not working on customer's PCB - Processors forum - Processors - TI E2E support forums

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa over 2 years ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 225785 points

Hello Oh Sangbong,

Refer below inputs i received from the display expert.

Their DSS driver probe failed due to some unknown reason and that is why kmsprint is showing like this.

Please verify if there is some error in the DT for the custome board.

Does the display function when the display is connected.

I understand the LVDS interface does not have dependency of the LCD connection.

Regards,

Sreenivas