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hello i replaced my apple watch series 3 screen and now the screen will not light up its blank but when i charge it its on because i hear the charging sound i dont know what to do please help

Did your old screen work before repair or was it blacked out? If it worked, try your old screen. If your old screen works, then double check that all the connectors are seated properly. On the series 3 those three connectors can be tricky to get pushed all the way up into their socket.

Did you ever get your Apple Watch working after replacing the screen?