How To Fix Ps 4 Disc Drive Without Taking It Apart. I start by removing the top and bottom covers, then the power supply screws. The rollers are in place and there's nothing broken in the drive itself.
IIRC, the biggest/widest ribbon cable powers that motor, smallest one is for the motor that pulls in/ejects disc, middle sized one is for the laser.
This is a classic fix for any device with problems.
After five minutes plug your console back in and turn it on. This may take a bit of force to open and you will hear a fairly loud click when the top cover detaches. The disc won't go in because there is some guard blocking it.