A Noobie Screen Voltage Question

[Ryaan1234]

I made this profile a loooong time ago but I lost interest in portablizing, mostly because I didn't have the funds to do it and I couldn't get the things I needed. Well, now I'm back and ready to make something and I have a question.

I've got this Audiovox dvd player which I bought cheaply off of eBay for the screen (yes, it did have video inputs) and I've discovered that the screen does not need the actual dvd player motherboard to function. The LCD controller is mounted behind the screen itself and it functions via the voltage and video inputs supplied by the motherboard.

It's very similar to this:
http://forums.benheck.com/viewtopic.php?t=18744" onclick="window.open(this.href);return false;

There are two sets of pinouts from the controller board, one for the screen's video input, and one for the speakers. The screen requires S-video inputs and a +9v current. Okay, this is the part that's confusing me. I want to test this screen to make sure it works properly and I want to run it off of a 9v current. How do I do that? Is there some way to make a +9v current from a 9v current, or do I need to get something like a 12v and regulate it down to +9v? (The dvd player ran off of 9v, just fyi) I hope this doesn't seem noobish, but it's been racking my brain.

[XCVG]

Ummm, just hook up 9V to it. If you don't have a 9V power supply, get one.

[Ryaan1234]

Okay, so there's no difference between +9v and just 9v? Wow, ummmm...... I said it was a really noobish question.

[Life of Brian]

To be fair there is such a thing as negative voltage and positive voltage, but for our usual hacks positive voltage is all we mess with.

[Ryaan1234]

I was confused because the PSone screens require a "+5v" from a voltage regulator. My screen has two red wires on the pinouts and on the board "+9v" is marked for both of them. I figured that if it had two wires for voltage, then that was for the negative and positive, but it's a bit confusing when they're both marked the same.

[Ryaan1234]

I'm not sure if you guys know what I'm talking about. My LCD has two wires coming from it. They are both red and the pins they went to were marked "+9v". The other wires coming from my LCD were marked C, Y, C GND, Y GND, GND, R, and L for S-video hookups and audio.

I've tried hooking up 9v to the two red wires with no avail. I also tried switching polarity and that didn't do anything. I know that the PSOne screen itself has a single pin marked +7.5v. How does somebody connect both negative and postive ends to that? Do you need to do something to get 7.5v on a single wire??? That's why I mentioned a voltage regulator, because you can get a single +5v wire from that, for example. I'm a bit confused about this and as soon as I get this sorted out I can start to test out video capabilities of this screen.

[Life of Brian]

You certainly do seem confused. A multimeter would help you answer this question very quickly. You would use the continuity function on it to see if the two are connected already, in which case it wouldn't matter which one you put 9v into. If they are not, then further investigation is needed. No, you NEVER put ground (negative) and your positive voltage to the same exact spot. That will fry your stuff. Switching polarity is also a very bad idea if you don't know where your voltage input and ground are. Ground is almost always found on blank metal spaces on the board, or where an outer sheath of an RCA jack is, and so on. If you don't understand what I am saying, I strongly suggest searching for some tutorials on basic electronics before you go further.

[Ryaan1234]

I hope what I'm about to say doesn't seem agressive to any extent (I'm not trying to be), but I do know a bit about electronics. I do a lot of circuit bending and I've even built a simple phototheremin. Circuit bending is just really reckless and that's probably why I seem a bit amateurish with my electronics (i.e. I was switching the polarity). I'm just trying to figure out what I need to connect to this screen to get power to it. I should know how to do this but I didn't want to connect 9v to the wrong wire(s) and ruin the screen, which I haven't done yet (ruin the screen, that is). If I understand what you said correctly then I'm supposed to connect the GND wire to the negative side of the 9v and the positive side of the 9v to one of the +9v wires? You said that the negative was ground. I'm sorry if I seem really inexperienced with this, or if I've completely misunderstood what you said, but I've just never had to hook up something like this before and I didn't want to mess it up.

[Zeturi]

Yes. 9v from power supply goes to +9v on the mobo, and connect the negative spot on the power supply to ground on the mobo.