I got some LED modules dismantled from old festival screen. It would be nice to get them working, but I can't find any info about them, neither I have any idea how to controll them. AFAIK they are made to be used in series on some bus, and each module has level shifter and 4 octal bus transceivers.

Each module is 16x16 pixels, 1 pixels is 4 LEDs (RRGB). But I can't figure out how to drive this thing. Each module is internally splitted into two 16x8 pixels module and each of these has 6 ICs (4x HD74HC245P (octal bus transceiver), HD74HC04P(hex inverter) and 74HC595N(shift register)). There are also 12-pin connectors (one for in, one for out that connects to the next module, propably made for bunch of modules in series), 1 is GND, the rest 11 are data. It has only label saying P/N 5ml0341122 (which was not found by Google) and "KS-341 Ver1.2" written on PCB

I was not able to find any documentation to this on the internet. Is there anybody who knows something about these modules? Thanks. Some pictures of them: https://photos.app.goo.gl/PH6HjkzokVJ7ovn49

//EDIT: I started to peel off the rubber that covers the LEDs side of PCB. There is one TB62705C for every 8 LEDs. Still had no idea how to drive these, but I think I'm getting close.

  • \$\begingroup\$ Do we assume that this was dismantled before any wiring or circuit layouts were taken - photos even? \$\endgroup\$
    – Solar Mike
    Commented Jul 12, 2018 at 16:21
  • \$\begingroup\$ I dont know anything about it. I just got the box with them and I was told that they were part of a big festival screen. \$\endgroup\$ Commented Jul 12, 2018 at 16:22
  • \$\begingroup\$ I was once in a similar situation with some panels of flip-dot displays. We traced out the connections from the logic chips to the connectors to figure out the interface, and then displayed some patterns to see how the data has to be arranged. It took some time, but if you have enough of the panels it may be worth it. Good luck! \$\endgroup\$ Commented Jul 12, 2018 at 19:48
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    \$\begingroup\$ Ah, that does make more sense. I guess you found the TB62705 datasheet. I would probably try to trace where these LED drivers get their serial data from, working backwards from the LEDs to the connector. \$\endgroup\$ Commented Jul 12, 2018 at 22:02
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    \$\begingroup\$ @MarcoZollinger Ah, that's where TB62705 comes into play. \$\endgroup\$
    – Maple
    Commented Jul 13, 2018 at 10:35

1 Answer 1


These look awfully similar to the ones in this question. Could be different model by the same manufacturer.

Here is interface description by Adafruit and great tutorial. Note that functional description in that tutorial refers to many components you've found on your panels. The controlling mechanism could be the same.


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