P1.953 128x128 LED Matrix, no display or random display

[DenizOzaydin]

Hello, I received a 128x128 panel from China a moment ago. Panel has several chips:

DP32020A: for multiplexing (there are 32 of them) (Q1-16), (QA1-16)

C84550P: I do not know the functionality (there are 96 of them) (UR1-32, UG1-32, UB1-32)

74HC245KAJ: there are not too much, 5 or 6

Standard HUB75 input with R1 G1 B1 GND R2 B2 G2 GND A B C GND CLK LAT OE GND

When I set the cable configurations as following: (Raspberry Pi Zero 2W is connected to the power with a micro-usb, panel is connected to an adapter with 5V/30A, and ElectroDragon board is receiving power from raspberry pi with GPIO), and run the demo with parameters `sudo ./demo -D7 --led-no-hardware-pulse --led-rows=64 --led-cols=128 –led-parallel=2 --led-row-addr-type=4 --led-slowdown-gpio=0 --led-brightness=10 --led-multiplexing=0 --led-scan-mode=1`, there is no display at all. I also tried the multiplexing values between 0-20, and all possible –led-gpio-mapping settings. (the panel HUB75 port is connected to one of the three ports of HAT)

However, when I cut the connection between ElectroDragon HAT and panel, run the demo and after I connect the HUB75 between HAT and panel, I get random noises as following:

and whichever demo I run, I get the same results. Also, –led-brightness option is not changing the brightness. I am sure that there are ground connections. What can be the issue?

[DenizOzaydin]

Note, the random noises occur when also Raspberry Pi is not connected to the HAT or HUB75.

[board707]

@DenizOzaydin

What can be the issue?

Incompatible driver C8455qp

[DenizOzaydin]

Any controller and library for driving the LED?

[board707]

I found nothing about this driver in the net; so I can’t advice.

Could you show the photo of the panel rear side (without cover, if any).

[DenizOzaydin]

[board707]

Thanks.
Unfortunately, the picture helps nothing in order to fix the issue.

Some of the options you used looks strange for me:

@DenizOzaydin

–led-rows=64 --led-cols=128

Why not 128 by 128?

@DenizOzaydin

–led-parallel=2

Do you really have a two parallel matrix chains?

3

@DenizOzaydin

–led-row-addr-type=4

it should be type 5

But to be honest, I don’t think changing the options will help launch the panel.

[DenizOzaydin]

Yes, you’re right.

I used –led-rows=64 because the demo is not supporting parameter “128” for –led-rows, and to compensate that, I added –led-parallel=2 but it is actually one single panel with 128x128 resolution.

I could not find any information about the chipset C8455QP, too. I hope they are compatible with PxMatrix library or ESP32-HUB75-MatrixPanel-DMA with ESP32, but I don’t think so. Very thanks for your help.