Sega CD Model 2 No Video

[Polygon]

So, I just got a model 2 Sega CD and when I power on the Genesis I get no video and the power light on the CD unit doesn't come on. I've tried another A/C adapter. I've opened up the CD unit and I can't see a anything that would make me suspect an issue. Any ideas on what I can look for or try?

[TrekkiesUnite118]

It could be a blown fuse. It's a pretty common issue with Sega CD systems.

[Polygon]

It could be a blown fuse. It's a pretty common issue with Sega CD systems.

I was wondering about that. Where is the fuse? The only thing I could imagine was a fuse was the tall thing on the upper right side of the board.

[zyrobs]

On Funai units it is the little green peg between the power input and the Megadrive connector marked F301.

Not 100% sure which one it is in Sony units, they seem to be using at least 3 fuses and they are different types than the Funai ones. I believe they are marked as FB503, 504 and 505 on the motherboard, so get a continuity check to see if they work or not.

[Guntz]

Google is your friend.

JVC/Funai type Sega CD 2 (black CD spindle):

http://img.photobucket.com/albums/v3...46f1217f_o.jpg

Sony type Sega CD 2 (white CD spindle):

http://farm3.static.flickr.com/2739/...c5c0e3b0_o.jpg

[Polygon]

Well, it looks like it's a Funai unit. Now, how do I test it? Do I need the Genesis hooked up to power it on or should I just be able to plug the Sega CD into the wall and test for continuity?

Edit: I'm getting a reading of 19.3 on my multi meter if I touch it to ground, but if I touch it to the negative side of the fuse it jumps to 4.2 then drops off to 0 again. Looks to be the fuse.

[Vector2013]

It could just be a fuse, but that is the typical answer thrown out there but it could be your voltage regulator and other issues after all these years. I recently asked a similar question for a model 1 but nobody gave a fuck in thread so after some intensive searching I found a replacement for voltage regulator but it still didn't help as it isn't getting correct power all the way up board so it's another issue besides fuse and voltage regulator and cap. But anyhow, hopefully this is all you need to do for your model 2 and hopefully answers your question.




http://www.youtube.com/watch?v=VM2mLVAX4rg
http://www.youtube.com/watch?v=nUZ9Jhl07vA

And more to right. There is one that is a reply video to the other type model 2 board and where to find that fuse(s) and replace that. I'll try to find that video tonight if you want even though you have other model, might come in handy one day.

Edit. Here.

[zyrobs]

Google is your friend.

JVC/Funai type Sega CD 2 (black CD spindle):

http://img.photobucket.com/albums/v3...46f1217f_o.jpg

Sony type Sega CD 2 (white CD spindle):

http://farm3.static.flickr.com/2739/...c5c0e3b0_o.jpg

Those are both Funai models.

[Guntz]

Well, it looks like it's a Funai unit. Now, how do I test it? Do I need the Genesis hooked up to power it on or should I just be able to plug the Sega CD into the wall and test for continuity?

Edit: I'm getting a reading of 19.3 on my multi meter if I touch it to ground, but if I touch it to the negative side of the fuse it jumps to 4.2 then drops off to 0 again. Looks to be the fuse.

To test a fuse, set your multimeter to resistance and put the leads on the two legs of the resistor. If you get a reading or beep, the fuse is still good. If you get no beep, or some infinite number, the fuse is broken and must be replaced.

Those are both Funai models.

What the hell is Funai anyways? I've never heard of that word.

[Drakon]

To test a fuse, set your multimeter to resistance and put the leads on the two legs of the resistor. If you get a reading or beep, the fuse is still good. If you get no beep, or some infinite number, the fuse is broken and must be replaced.



What the hell is Funai anyways? I've never heard of that word.

It's japanese, means "boat well" when read as mandarin.

"Funai was founded by Tetsuro Funai". Just some dudes name it seems.

[zyrobs]

To test a fuse, set your multimeter to resistance and put the leads on the two legs of the resistor. If you get a reading or beep, the fuse is still good. If you get no beep, or some infinite number, the fuse is broken and must be replaced.



What the hell is Funai anyways? I've never heard of that word.

You do continuity checks not resistance check, since the point of the fuse is to blow up if there's a voltage spike that can hurt the rest of the circuit, thereby cutting the connection to them and preventing damage to the rest of the hardware.

Funai is a hardware manufacturer.
http://en.wikipedia.org/wiki/Funai

They made Mega CD 1s and 2s, 32xs, and Saturns at the very least.

[Polygon]

The reason I was checking for voltage was because my continuity setting on my multi meter wasn't working. Turns out the battery was pretty much dead. Changed the battery and with it working did a continuity test... nada. The fuse is definitely blown. Hopefully there aren't other issues. New fuses should be here next week. Thanks for the help!

[Guntz]

You do continuity checks not resistance check, since the point of the fuse is to blow up if there's a voltage spike that can hurt the rest of the circuit, thereby cutting the connection to them and preventing damage to the rest of the hardware.

Funai is a hardware manufacturer.
http://en.wikipedia.org/wiki/Funai

They made Mega CD 1s and 2s, 32xs, and Saturns at the very least.

Umm, a resistance check basically IS a continuity check. At least it is on my multimeter.

Most people determine a Sega CD by the type of drive it has, such as JVC or Sony.

[Drakon]

Google is your friend.

JVC/Funai type Sega CD 2 (black CD spindle):

http://img.photobucket.com/albums/v3...46f1217f_o.jpg

Sony type Sega CD 2 (white CD spindle):

http://farm3.static.flickr.com/2739/...c5c0e3b0_o.jpg

Haha, repped.

[omp]

Don't forget the Samsung laser! Oh won't someone think of the Samsung!