You get a controller chip for the PS3 BD 7956.
The chip has control functions in the PS3, which affects the laser. Very often we get asked the question, whether it's this chip that is faulty when the drive is not spinning. This may be the case, but very often it is simply the laser when the laser detects nothing and are so not a signal to the motor, then this does not rotate.
Only when one is sure that there is not a laser problem, you can try the problem by replacing this chip to solve. For as long as you do not have equipment to check the chip, there are no statements 1000% when this chip may be defective. But the fact is that it was actually a few times on this chip and the exchange fixed a bug.