So, i found the Q10 Keyboard for my project and JoeN from the EEVBlog Forum also already did the work to reverse engineer the Keyboard matrix.
But as i know that this keyboard can also be backlit i wanted to to get the backlight running.
At first i tried just the good old try all the pins with all the other pins in Diode testing mode - and i did not really get much out of this. So as Dave Jones always says: “Don't turn it on, take it apart”, i then took it apart.
I found a lot of nice metallic tactile domes for the keys, a few Resistors AND 4 LEDs.
Now that i had access to the LEDs i was testing them directly with the diode test mode of my DMM and there they are White LEDs with 2.5v diode drop.
Then i beeped out the connections of the diodes and got a really strange back to back front to front arrangement.
But while removing the flex pcb from the metal back i ripped of one of the resistors, and as i only have one keyboard left, i’ll wait for the next Aliexpress shipment of 6 of them to take another one apart and find the missing connections.
But i found the grounds and one LED connection for that connector. Hopefully i’ll find them all when i can take another one, more carefully, apart. If anyone has any tips on what this strange LED arrangement is please tell.
JoeN Connector Pinout + my findings
GND 28 1 GND ROW7 27 2 26 3 D1- 25 4 24 5 23 6 ROW1 ROW6 22 7 COL1 ROW5 21 8 ROW2 ROW4 20 9 COL2 COL5 19 10 COL3 ROW3 18 11 GND COL4 17 12 GND 16 13 GND 15 14