Should I replace motherboard or buy the same phone again?

[werem]

I have a Samsung Galaxy S4, it had some charging problems, I replaced usb port and it fixed it for a while but one night I left it to charge and in the morning phone didn't respond to charger or power button being pressed, I borrowed full battery from my friend to see if I should buy a new one but it didn't want to power on even with a charged one, guy at repair shop says it's most likely the motherboard and I would be better off just buying a new phone but I would like to repair it since S4 is a really good phone for it's price. Now the question is - should I repair it or look for a new phone? I don't want to spend more than $70 and ones cheaper than that are worse. How likely is it that after replacing motherboard everything will work fine again? Btw buying used S4 wouldn't be much more expensive so I have to decide whether I want a new motherboard which would be fast but not sure if working or used phone that works but is probably slower.

 

[Saga Lout]

How does it behave if you remove the battery and rely only on mains electricity?

 

[werem]

How does it behave if you remove the battery and rely only on mains electricity?

It doesn't, no reaction from power button or anything

 

[Saga Lout]

I hate to say this but it sounds like end of life. Is there a 'phone repairer in town?

 

[werem]

I hate to say this but it sounds like end of life. Is there a 'phone repairer in town?

There are but leaving it for someone to repair it would be more expensive than buying used S4