Home button cable broken
I have an iphone 5s that was "repaired" by a shop. The power button cable was broken and resoldered with gold wire. The home button cable was broken. The shop told my daughter that the logic board was going bad. I replaced the logic board and upper component cable in the phone, however I still get a blank screen when trying to turn it on. Will the home button cable being broken stop the phone from starting? I have tested the battery pack and get voltage. Is there a way to see if the display is bad with an oscilliscope or voltmeter?