Second time this happens to me, i replaced a battery on an iphone SE and everything went well, i had to open the iphone again, i had to detach the screen while the phone was on (couldn't turn it off at that moment) and now the phone doesn't turn on.
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One of the dangers of connecting and disconnecting a phone with an LCD display with the battery still connected is that it's all too easy for some of the pins to short together and blow the circuit on the screen controlling the backlight. That's why the first step in virtually all iPhone repairs is to disconnect the battery.
If you had unplugged the battery before removing the screen, it wouldn't have mattered if the phone had been on or not; that would have been a better choice.
However, that's all beside the point now; what we're trying to do is get you going again. As @ezzgen said, we want to know if the phone is dead or perhaps it's just that the screen isn't responding. There are a few things to check.
If you get any positive results from trying the things I listed above, then it sounds like your next step should probably be to consider replacing the screen. Fortunately, for an older iPhone like yours the price of LCD screens has dropped hugely; you should easily be able to find a replacement for under $20 USD, if not less.
Let us know what you find and we'll see if we can figure out what to do next for you.
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I could get one of the SE (because i have two with the same problem) to turn on with a hard reset but now there are two white lines running vertically across the screen, they are pretty faded but you can still see them.
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Does it connect to a computer or anything? are you sure it isn't turning on but without backlight or anything?
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Did you not follow any guides? Always always always disconnect the battery first. If you disconnected then reconnected the screen with the battery connected then you’ve blown the backlight filters. Or worse.
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