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mex posted a topic in MIDIbox SEQ#Update 1: working now, did forgot to solder the R33 resistor network on the bottom PCB under the STM32F4 eval board... silly me This tends to happen quite a lot to me when i have half finished projects lying around everywhere. So LCDs do work sweetly, but do not know exactly if the wilbas frontpanel is correctly working, seems quite random some of the led pattern, but i will have to look into that when i finish ubilding. Hello, as i did finish my MidiBoxSid a while ago, I did follow the advice of some other member here and looked into the MidiSeq v4. So i simply ordered all the stuff, or had it at home anyway. Now i am running in some issues, which are probably easily solved by some of you guys who already have one: So My MIOS32 bootloader did flash on my STM board easily without trouble, I can also detect and upload the MidiSeq newest firmware, and it is read by the MIOS studio software, it says 1 minor issue was detected while flashing, but also states that it could be solved whatever that means, so I think everything might be ok with the Code. I can also open the MIOS file viewer and see that something is stored on the sd-cardm so I assume everything is working properly, right? Now I did attach the Wilbas Frontpcb and the 2 LCDs, some from newhaven ordered via mouser, they run on 5V and the rest should also be connected fine :) at leats i do hope so right now, I did go thru the cabling quite a lot since it is kind of tricky since it is mirrored and stuff. When I connect the USB cables for power then the backlight is lit on both, but i only get dark rectangles on the upper collumn, I thought maybe the midibox logo or version number should appear and so on, so something is not working right yet. So here the big question? Do i have to configurate something else? The LCDs should work without any Front-PCB attached, right? since they are not connected whatsoever. Why do my LCDs not show the right things, maybe wrong LCDs, but I assume mouser is only providing the "right" ones. maybe some file missing on the sd-card, but it should simply work without the sd-card, right? I mean for testing something should be printed on the LCDs? MIOS Studio is stating that the right seque code is detected, so there should not be a problem with that, maybe i simply flash the bootloader again later and go on form there, check all the ICs. And last question, the J8/9 cable, goes 1:1 to the mirrored plug form the frontpanel, or does it have to be mirrored just liek the LCD type??? This is specially confusing to me since it is not clear if SI is supposed to go on SI, or like ususally in communications, SI is going to SO! Kind of tricky to document too,but luckily nothing be damages if this connection is wrong it simply wont work. Thanks for reading and probably helping. cheers.