Outdoor P10 Panel - can only light half

Other Hardware LEDs and Multiplexing
1

I have an Outdoor P10 panel - 16 x 32 RGB.

Identified on back as "p10-4s-3535-3216-ja1".

The connector if labeled as a HUB75D.

The board contains 4 FET packets, 2 - 74hc245 drivers and 24 - TC5020 (16 led drivers).

The HUB75 connector has address lines A, B, C, D. On many panels, these lines go to a multiplexer - but these do not.

A, B, C, D are active LO - and when 64 bits of data is shifted in on one of the color lines - two rows of leds are lit.

The bottom half of the panel can be addressed by address lines A, B, C, D and 64 bits of data.

More than 64 bits no not light up leds on the top half.

I am not using a library - currently bit banging to figure out how the panel works. All of the existing libraries have address lines (A, B, C, D) feeding a multiplexer - and this board does not have one.

I can NOT figure out how to address the top half (or bottom if my orientation is upside down). I thought they may have used an "E" address line labeled as GND - but that was not the case.

Any ideas as to how to address the other half of the panel?

Thanks

2

24 x TC5020 is enough to drive 4 rows ie. 1/4 of the panel. Perhaps A, B, C, D are simply enable lines for the 4 quarters of the display?

Have you tried sending 128 bits ? Perhaps the TC5020 are in chains of 8.

Did you find this?

3

Yes I did send 128 bits -- no change.

I figured it out - really stupid mistake not worth sharing.

1 Like