Problem with my Sega CDX

[darkshadow1804]

hi there!
i recently got a Sega CDX from a guy, that told me the console runs just perfect, but not playing the sega cd games sometimes...so i remembered that that is caused by insufficient amps (he used a 1200mA 9v transformer instead of 1500mA or higher)...so i plugged my 2000mA 9v one into it, and tried with a genesis game first (SONIC 2, yay!)...the genesis part works flawlessly, while the LCD screen says GAME on it...but when i power it on without a cartridge, it's supposedly to run in sega CD mode, the CD inside spins a bit, but nothing happens, just a plain black screen (and hissing noises on the headphone jack), and the LCD displays GAME only, not ACCESS...so i thought that the cd drive could be faulty, but it isn't, because i put in a couple of AA batteries and tried the CD player mode, and works very well without having ANY difficulty to read an audio CD, so...
what the problem could be?

i post a video to show you the problem:



could be the 12Mhz CPU, the BIOS or a DRAM chip dead? or just as simple as a faulty resistor or capacitor?
help! i don't want to get it back to the guy that sold it to me without having a clue of what is wrong with it and being able to fix it

thanks in advance!!!

[atarifanboy1980]

It have to be a laser problem . You have to replace it .

[darkshadow1804]

a laser problem? hmmm...but why can i play audio cds with the batteries?

[atarifanboy1980]

a laser problem? hmmm...but why can i play audio cds with the batteries?

Let say you have a ps3 right that play all ps1,ps2 ,and ps3 games. And it having problems playing ps1and ps2 games right but it can play ps3 games . see ps1 is formatted a cd-rom game right . Now for the ps2 games is formatted dvd right . If you have that problem it have to be the laser going out and needs to be replaced . Simple as that .

[darkshadow1804]

could be,
so that is the reason the sega cd mode just gives me a plain black screen, not the bios animation nor nothing else? D:

[atarifanboy1980]

could be,
so that is the reason the sega cd mode just gives me a plain black screen, not the bios animation nor nothing else? D:

That could be it . I mean usually a laser don't last long . lol . It would be the same for any game system that have a laser to me . Myself never had played a Sega CD or CDX system so I don't know much about it . I hope that I help you out some .

[Tokimemofan]

Let say you have a ps3 right that play all ps1,ps2 ,and ps3 games. And it having problems playing ps1and ps2 games right but it can play ps3 games . see ps1 is formatted a cd-rom game right . Now for the ps2 games is formatted dvd right . If you have that problem it have to be the laser going out and needs to be replaced . Simple as that .

You are misunderstanding how these work, your PS3 example is misguided because a PS3 has 3 Laser Diodes either of which can die individually, a dead 780nm breaks cd-rom (Blue and Black discs CDs) 650nm breaks DVDs and 405nm breaks BluRay (and usually everything else as the ps3 starts it in 405nm mode to check for the presence of a disc) The Sega CDX only has 1 laser. A laser failure also couldn't cause the black screen problem. Check and make sure the bios is good and original, some people like to put a region free bios in these things, if such a mod is done wrong it would cause this as could a lifted pin on any of the surface mount IC chips. It is likely to be a hard to ID failure since there are not many simple problems that would still allow the Genesis and Walkman modes to run while disabling the bios completely. The symptoms are similar to a model 1 that had 4 lifted pins on one of the cpus. Get out a good magnifying glass and inspect every connection on both boards.
Edit: Another note, The BIOS will run without a laser assembly even being present, something I tested when part swapping to ID a broken part on one I had.

[atarifanboy1980]

You are misunderstanding how these work, your PS3 example is misguided because a PS3 has 3 Laser Diodes either of which can die individually, a dead 780nm breaks cd-rom (Blue and Black discs CDs) 650nm breaks DVDs and 405nm breaks BluRay (and usually everything else as the ps3 starts it in 405nm mode to check for the presence of a disc) The Sega CDX only has 1 laser. A laser failure also couldn't cause the black screen problem. Check and make sure the bios is good and original, some people like to put a region free bios in these things, if such a mod is done wrong it would cause this as could a lifted pin on any of the surface mount IC chips. It is likely to be a hard to ID failure since there are not many simple problems that would still allow the Genesis and Walkman modes to run while disabling the bios completely. The symptoms are similar to a model 1 that had 4 lifted pins on one of the cpus. Get out a good magnifying glass and inspect every connection on both boards.
Edit: Another note, The BIOS will run without a laser assembly even being present, something I tested when part swapping to ID a broken part on one I had.

I just thought it might be a laser problem thank you for clearing it up .