Samsung S4 charger won't charge my phone while it's turned on, why?

[AC Question]

Samsung s4 charger won't charge my phone while it's turned on why

my phone will charge while it's turned off but as soon as I turn it on it won't charge any ideas what it could be

 

[Rukbat]

Re: Samsung s4 charger won't charge my phone while it's turned on why

Won't charge, or the amount of charge keeps going down?

If the latter, it could be a bad component on the motherboard or an app using more current than the charger is feeding into the phone. (A larger charger won't help - the amount of charging current is limited by the phone itself.)