Hi there!
Usually it’s the laser which is done. I had many PS2 Slim repaired with this.
Here is my guide: [guide|135413]
It’s possible that a different type of laser is installed, if this is the case, please refer to my other guide: [guide|134945]
The process is nearly the same for both lasers and all PS2 Slim models.
Part:
https://a.aliexpress.com/_EvOQewU
Please check if the laser model fits the part above.
Please try this first and see if it works! If you have any question, please let me know!