As the name suggests I have installed a Modbo 5 both in a PAL 39003 & 30003R, both of which have stopped reading discs after the install, even after removing the chips and returning the PS2s back to stock.
Both read games prior to the Modbo install and I have installed the chip on a few consoles previously and never had any issues. Also all other features of the Modbo work as intended.
After the Modbo install the 30003R read PS2 games but not PS1, and after some fiddling, now it takes a minute to even attempt to load a disc and can only launch PS2 games to the DVD player menu, which does suggest the laser is either on the way out or needs to be recalibrated. This happens with both disc drives.
The 39003 now just spits out a disc error no matter what. The laser does turn on and attempt to read the disc for a second, but does not progress further than that. As this occurs with both disc drives, I have a feeling this may be an issue with the PS2 motherboard rather than the disc drive, but I'm not too sure.
I have cleaned the boards with alcohol and checked for shorts and everything looks fine. I have heard sometimes fuses can cause this issue or a faulty la6508 chip. The games I am using to test are a legitimate PS1 and a silver DVD PS2 game and work fine in other consoles.
Before attempting a PMAP and looking into getting replacement lasers, is there any other areas I should check first which could have caused these issues?