Chosen Solution
Hi, I’ve been repairing an S4 recently, it was smashed and is now riddled with problems. I’ve just bought a replacement sim card reader as the previous did not work. the wifi/bluetooth do not work but I bought a replacement antenna, I am wondering if this is the cause? also the external speaker does not work does anybody know why the external speaker wouldn’t work?
To resolve the matter permanently you need to make microsoldering work: How to repair WI-FI wireless connection in Samsung Galaxy S4
