Why isn't this iPhone 5 working?

I have an iPhone 5 that worked fine until it just suddenly stopped working. Its out of warranty so can't be replaced.

I replaced the charging port assembly to se if that was the problem, but still nothing.

I then replaced the U2 IC chip on the motherboard as this was also said to cause this malfunction.

However the phone still doesn't power on at all or even charge? What could be the problem?

I'd take it to an Apple Store to see what could be done there.

Being out of the warranty means you'd have to pay for the services done to it, not that they wouldn't even touch it.

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