another update,
after a complete dissasembly of the CDTV, (which included drilling out stuborn screws keeping the entire cd rom assembly in place) i cleaned the cd laser manually and reassembled also during reassembly i checked all caps on the sound stage of the pcb (mainly arround the dc power in area) i found that some of the caps legs had become squashed down causing the legs to become extremely intimate with each other so with a small tool i gently persuaded them away from each other, as i figured the popping and poor sound quality could be because there is a short somewhere?
just a word about the cd rom dissasembly, it is very awkward and time consuming and extremely fiddley, the cd lens cleaning mount retaining spring pops away when the top plate is removed and is extremely tedious and annoying to put back in (took me a while lol)
Good news is that sound now seems to be fixed, must have been the capacitor legs shorting
the mouse port mod seems to be broke now, must be because i flipped it back and routed the ribbon cable through the underside of the motherboard ill have to sort that..
the bad news is that the cd rom drive is still not working right :-(
the CDTV seems to have trouble mounting a cd, it seems to work best when booted from cold, for e.g i know if i power it up from cold putting a cd in will either work first time or after a few attempts, but after say 10/15 minutes i eject a cd and put another in it will either take 500 ejects/resets to recognise another or the same disc? or i give up out of fustration lol. The wierd thing is tho once it recognises a disc and mounts it, it will work fine until i eject it.. whether it be after a few minutes or a full day?
above is the laser lens prior to cleaning
above is the underside of the cd drive pcb note some of the ic's look like they have melted a little?
when a disc is inserted the disc spins slowly, the light comes on and i can hear the laser head movind to the center of the disc to read, it then most of the time just stops (light goes out)and does nothing, i then press the eject button (not fully) to make it think i have reinserted the disc, i keep doing this until after the innitial read the disc will start spinning full speed (thats when i know it has worked)
interestingly tho even tho the discs refuse to mount the screen does not go red (indicating a non supported disc) i guess it fails before it gets to that stage i dunno...
well if anyone has any more suggestions i would be very greatfull, i have tried pushing the caddy down, but that makes no difference..
oh and thanks arttu80 that service manual will come in handy :-)
one last thing, when i took the cd drive apart, i spent a while trying to figure out how the drive actually recognises a disc has been inserted? there is no pressure switch, latch, sensors anywhere, just the mechanical mechanism, wires only go to the laser and motor, nothing else? i figure maybe some sort of electrical contact on the caddy? but nope.. my only guess is magnetic induction from the center cd mount (as it magnetically connects to the small disc that is in the caddy lid cplamping the cd in place), anyone have any insight on that?
