And I just did it.
I decreased the resistance of both pots a little bit and now my drive can read dvds again. So if you have an old burner that stopped reading one type of discs (CD/DVD) you can do this trick.
Decreasing should be done in small steps and then check for the results. In my case (Sony DW-23A@LiteOn 1653S) the values are as follows:
- default value of 217Î© trimmed down to 182Î©
- default value of 180Î© trimmed down to 162Î©
Since I didn't know what pot is for what (szabi mentions that one is for DVD and another for CD laser) I had to adjust both of them.
But I also noticed that if you go too low with values, discs won't read again.
For example, values of 164Î© and 133Î© (respectively for each pot) are no go for this drive.
I hope somebody else shares their experience with fixing drives this way. Although it's said to be a temporary fix, I've read people reporting their drives serving as long as one year after the intervention.