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→V5 kits sold before 2025-06-01 - Fixing FFC connectors (last resource!)
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All kits sold after 2025-06-01 are fixed and free from this defect.+
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The solution is simeple and it has been already explained by @simmeah:+> **Use a cutter or scalpel to cut the 2 tiny plastic bumps that cause the issue.**+The bumps are really tiny and you probably need good eyes or magnifying glasses. The tool must be well sharpened, so the plastic bumps can be cut will minimal force. Be extremely careful to not worsen things by breaking the FPC's tonge.++
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−I only recommend to perform this action if you have any of these problems:
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−+ Control board connection issues, like:
− + Control board not being detected on first boot.
− + Some buttons or knobs behave erratically or doesn't work.
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−+ SD-card extender doesn't work or it's not stable enough. You should be sure of using good quality SD-cards of the right sizes (32 or 64GB). Also, check the SD-card extender is not broken nor damaged.
−And **YOU HAVE DOUBLE CHECKED** the build tutorial and you are sure you followed the instructions carefully and everything is according to them. **This should be a last-resource action before considering to replace the board.**
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−='''V5 kits sold before 2025-06-01 - Fixing FFC connectors (last resource!)'''=
+='''V5 KITS SOLD BEFORE 2025-06-01 - Fixing FFC connectors'''=
Recently we have detected a little defect that could be the cause of some rare issues reported from time to time. We never experienced these issues in any of the builds we realized in zynthian labs and this is the cause we haven't detected the problem before.
Recently we have detected a little defect that could be the cause of some rare issues reported from time to time. We never experienced these issues in any of the builds we realized in zynthian labs and this is the cause we haven't detected the problem before.
−{{WarningBox|All kits sold after 2025-06-01 are fixed and free from this defect.}}
+'''The symptoms'''
+* Control board connection issues, like:
+** Control board not being detected on first boot.
+** Some buttons or knobs behave erratically or doesn't work.
+* SD-card extender doesn't work or it's not stable enough.
+and:
+* '''YOU HAVE DOUBLE CHECKED''' the build tutorial and you are sure you followed the instructions carefully and everything is according to them.
+* You are using '''good quality SD-cards of the right sizes (32 or 64GB)'''. Also, check the SD-card extender is not broken nor damaged.
+{{NoteBox|'''This should be a last-resource action''' before considering to replace the board.}}
+'''The defect'''
'''The defect'''
−The FFC connectors we currently use doesn't fit perfectly the standard ribbon cables we use. The reason is we accidentally choose a wrong part number and didn't realized until now because the difference is really small it works most of times. We have already fixed the BOMs so next boards will be manufactured with the right part number but i would like to offer a solution for those having issues with this.
+The FFC connectors soldered on main and control boards doesn't fit perfectly the standard ribbon cables we include in the V5 kit, causing the cable to bent when closing the tonge and potentially causing bad contact or, at worst case, damaging the flat cable.
−[[File:FPC-issue-bent-cable.jpeg|800px|right]]
−The reason is we accidentally choose a wrong part number and didn't realize until now because the difference is really small it works most of times. Indeed i never suffered the issue in any build i did here, in zynthian labs, and i did a few ones!
−We have already fixed the BOMs so next boards will be manufactured with the right part number. Also, we are fixing all boards we have stocked so:
−{{NoteBox|'''ALL V5 KITS SOLD AFTER 2025-06-01 ARE FREE FROM THIS DEFECT''' and you don't need to fix this because we already did. If you have issues, the cause is not this.}}
−You must repeat the operation for all FPC connectors used by V5. They are:
+Anyway i would like to offer a solution for those having issues with this. Indeed, the solution is simple and it has been already explained by @simmeah in the forum:
+ '''Use a cutter or scalpel to cut the 2 tiny plastic bumps that cause the issue.'''
+The bumps are really tiny and you probably need good eyes or magnifying glasses. The tool must be well sharpened, so the plastic bumps can be cut will minimal force. Be extremely careful to not worsen things by breaking the FFC's tonge.
+[[File:FPC-issue_plastic_bumps_redcircles.jpg|800px|right]]
+You must repeat the operation for all FFC connectors used by V5. They are:
**Main Board**
**Main Board**
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+ SDCARD-RBPi1
+ SDCARD-RBPi1
−[[File:V5.1_main_fpc_issue_01.jpg|800px|right]]
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+ CONTROL-1
+ CONTROL-1
−[[File:V5.1_control_fpc_issue_01.jpg|800px|right]]
−May the force be with you :nerd_face:
+May the force be with you and remember: '''better asking than crying!!'''