cube48

MB Seq V4: Constantly lit LEDs [SOLVED]

4 posts in this topic

My freshly finished MB Seq V4 with Wilba's standard CS is working nicely except that a few LED's are constantly lit.

 

Affected LED's are:

 

Track Group 3

Track 2
Track 4

Trigger Layer B

Parameter Layer B

Step View (fully lit) 

Solo

 

They are all a bit dimmed (except Step View) and they become fully lit when their button is activated. There is 2.27V going through these dimmed but lit LED's. 

 

I can't see any bad solder joints. The only clue I've come to is that all affected LED's are assigned to pin 1 of various SR's (shift registers?). Other normally working LED's are using different pins. I have no idea if this can be related somehow. Here is the excerpt from the config file.

 

##################################################
# LED assignments to DOUT pins
# SR = 0: LED disabled
# SR = 1..23:  directly forwarded to DOUT pin
# SR = M1..M8: forwarded to a 8x8 LED matrix
##################################################

#           SR  Pin
LED_TRACK1  M7   2
LED_TRACK2  M7   1
LED_TRACK3  M5   2
LED_TRACK4  M5   1

#                SR  Pin
LED_PAR_LAYER_A  M4   2
LED_PAR_LAYER_B  M4   1
LED_PAR_LAYER_C  M4   0

#         SR  Pin
LED_BEAT  M1   1

#                    SR  Pin
LED_MIDI_IN_COMBINED  0   0
LED_MIDI_OUT_COMBINED 0   0

#           SR  Pin
LED_EDIT    M5   3
LED_MUTE    M6   3
LED_PATTERN M6   2
LED_SONG    M7   3

#           SR  Pin
LED_SOLO    M6   1
LED_FAST    M6   0
LED_FAST2    0   0
LED_ALL     M7   0

#           SR  Pin
LED_GROUP1  M8   3
LED_GROUP2  M8   2
LED_GROUP3  M8   1
LED_GROUP4  M8   0

#                SR  Pin
LED_TRG_LAYER_A  M2   2
LED_TRG_LAYER_B  M2   1
LED_TRG_LAYER_C  M2   0

#          SR  Pin
LED_PLAY   M1   3
LED_STOP   M3   3
LED_PAUSE  M2   3
LED_REW    M3   2
LED_FWD    M1   2
LED_LOOP    0   0
LED_FOLLOW  0   0

#              SR  Pin
LED_EXIT        0   0
LED_SELECT      0   0
LED_MENU        0   0
LED_BOOKMARK    0   0
LED_SCRUB       0   0
LED_METRONOME   0   0
LED_RECORD      0   0
LED_LIVE        0   0
LED_UTILITY     0   0
LED_COPY        0   0
LED_PASTE       0   0
LED_CLEAR       0   0
LED_UNDO        0   0

#                  SR  Pin
LED_STEP_VIEW      M3   1
LED_PAR_LAYER_SEL   0   0
LED_TRG_LAYER_SEL   0   0
LED_TRACK_SEL       0   0

 

Any tips or suggestions are welcome. Thanks!

Edited by cube48

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If there aren't any bad solder joints check that all the 74HC595 shift registers are seated correctly in there sockets and there aren't any bend pins that have failed to make contact, assuming that you are using IC sockets.

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Thanks a lot!

 

And especially to smashtv who directed me via PM to the right place and gently pointed out the LED 31 holes being flipped. My LED was indeed flipped and putting it into right orientation did the trick. I completely missed that one during the final LED dropping stage. Now is all fine. Thanks again!

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Right on man... that shit can get frustrating... I remember that during my build that one was oriented opposite to the others and not to make that mistake...

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