PS2 PS2 Disc reading Lottery

Hi all, decided to come to the experts...
I have a ps2 slim, SCPH77004, it has a modbo modchip, unsure of the model but runs matrix infinity v1.93. Im having an issue with disc loading, in the sense that it would take multiple tries for the ps2 to read and recognise the discs (i.e. opening and closing the dvd drive door) for the disk to finally be recognised.

I tried to replace the laser to solve the issue, tuning the potentiometers and desouldering the solder bridge, and it gives the same result,

What should I do next, and thanks for your help
 

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