Hi Guys,
I also have had the same problems with my CDX not reading any disks. At first it was unreliable at reading disks, would read some and not others, and then eventually (recently) stopped reading any disks.
Following the advice from this forum I replaced all the electrolytic capacitors on the top board (decoder board), including all the 22uF, the single 1uF and the single 150uF caps. I also resoldered any suspect looking joints, about 10. Also I resoldered the whole PSU board as a preventative measure. Put it all back together and it works brilliantly!!
I have now cleaned and polished it up and wow!, it is still a beautiful looking product, now bought back to life with your help.
Thanks very much guys, appreciate it.
Ian