Can You Recover Data From An iPhone That Won't Turn On?

Yes! but it all depends on what's preventing your device from turning on.

Common no-power issues on iPhone

Your iPhone may not turn on for various reasons. It can be as simple as a bad battery and charging port or a bit more complex if the logicboard develops a problem. Two common logic board problems that may prevent the device from turning on are a faulty charging circuit, which can prevent the battery from receiving any power, and a shorted power rail, such as VDD_MAIN, which provides power to essential circuits in your logic board.

What would make an iPhone with a no-power issue Irreparable

It's pretty rare to see an iPhone with a power issue that cannot be fixed.
Extreme cases, such as an iPhone with a cracked CPU or NAND storage chip, can be the exception. These two chips are essential for a successful data recovery, although a few more examples can be mentioned.

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