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I disconnected the io board of my shorted circuit a1502 and now it boot. What should i do now ?

Sounds like you know the issue is within the I/O board or the I/O cable. I would replace both! MacBook Pro 13" Retina (Late 2013-Early 2015) I/O Board Data CableMacBook Pro 13" Retina (Late 2013-Mid 2014) Right I/O Board And here’s the guide to replace them: MacBook Pro 13" Retina Display Mid 2014 I/O Board Replacement