# \#sy77

**URL:** https://forums.syntaur.com/tag/sy77/2842.md

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## [Yamaha SY77 not booting](https://forums.syntaur.com/t/yamaha-sy77-not-booting/701)

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**Author:** [@gilesjuk](https://forums.syntaur.com/u/gilesjuk)\
**Replies:** 6\
**Last updated:** [December 17, 2019, 11:25pm UTC](https://forums.syntaur.com/t/yamaha-sy77-not-booting/701 "2019-12-17T23:25:01Z")

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Hi all, I bought an SY77 with dead backlight and busted tact switches. I replaced the screen and switches but also swapped the memory battery and put a holder in, but reversed the polarity :frowning: Now when I start it…