“How to get my Rocketfish MHL adapter to charge my Galaxy S4 My Rocketfish adapter works, but it will not charge my Galaxy S4. It has no problems charging my Galaxy S3. Please help?”
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Check the power output through the MHL adapter. I used an app from Play Store called "Galaxy Charging Current." It will tell you what the charge rate is when plugged in. Plug a charger directly to the phone and you'll probably get somewhere between 900-1900mA (max.). Then insert the adapter between the charger and phone. When I used my Rocketfish 18" cable, I got 1900mA (max rate for the S4, when battery is really low) and it dipped to 960mA as phone approached full charge. With Samsung's adapter, I got 300mA no matter what level the charge was at.
Sorry, there was a problem. Please try again later.There are many factors involved in this with the most likely being that the phone is using more power than the cable can provide. We know that the charging feature works since it works on the S3, so you might contact Samsung to ask why it won't charge the S4.
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