#Gameboy Micro - what exactly is causing the start button to not work?

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restive smeltBOT
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Please remember to provide as much information as possible including all troubleshooting steps you have already taken. If this is a hardware issue, please provide clear in-focus images of the issue, PCB (circuit board), installation, and any soldering you have done. Help us help you, posts with insufficient information will be deleted

round tulip
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Mishandling the ribbon has more then likely damaged it.

Have you used your multimeter on continuity mode to confirm the tact switch is functioning and closing the circuit?

If the tact switch is working, Then check continuity from the button board to the main micro board.

Random guide that can also help you with locations to check for continuity.
https://www.instructables.com/Fixing-ripped-off-STARTSELECT-board-ribbon-cable-o/

Goodluck.

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Instructables
Fixing Ripped Off START/SELECT Board Ribbon Cable on GameBoy Micro

Fixing Ripped Off START/SELECT Board Ribbon Cable on GameBoy Micro: GB Micro, released in 2005, is amazing example of miniaturisation with it's paper-thin (literally, it's about 0.4 mm thick) multi-layered PCBs and flex cables going in between those layers, without any connectors, to save space. It's something to lo…