Running my screen of the GC Power supply

[Crazy Inventor]

I asked this before, didn't get much help, figured it was posted in a place not many people look in.

So I got back into finishing my GC portable and I've been tying to get my screen to run off it's power supply. The screen is a Haier HLT71 screen and the battery that used to run it is 7.4V. The battery stopped working a few years ago and I've been using a cable I soldered that plugs in to a car adapter that you would plug into your wall (if I made that confusing,I probably did, you use it to power things that have a 12v car plug, in your home). So because of that adapter, I keep thinking that the screen will work with 12V. It doesn't. When I plug the GC power supply into to the screen, the psu craps out and stops working for a few minutes.

I'm not sure if it needs 7.4V or if it's just a werid problem; I'm going to want to find a power supply to power them both but I don't know if I need to get a regulator or just a different psu for this.

are you plugging it into just the screen, or the whole GCP? it sounds sort of like something is shorting and the PSU is stopping to prevent a blown fuse. Does the screen still work with any other adapters?

I'm plugging it into just the screen. I don't even turn it on and the power brick will stop working for a few minutes; I'll solder the screen's plug to one of the black and red cables that plugs into to the power switch that the GC plugs into (the little circuit that has the big black button), it'll still work. But plug the soldered cable into the screen and it stops, even without turning the screen on.
And yeah, the screen used to work with a 7.4v battery that was included with it but it stopped holding a charge a long time ago. I don't have any other adapters in the 7.4-12V range; just laptop chargers that are around 18-24V. I feel like the GC's power supply is too much for it, but that's just my assumption.

I was thinking of trying to run the GC off 7.4V but I'm honestly confused on how to do that.

 

[Blargaman91]

Are you positive you have to polarity correct when wiring to the GC's power brick?

I was thinking of trying to run the GC off 7.4V but I'm honestly confused on how to do that.

The GC can be run of 7.4v pretty efficiently if you get rid of the stock regulator board and make your own. The main parts I'd use are these two regulator:
http://www.digikey.com/product-search/e ... th08080wah
http://www.digikey.com/product-search/e ... s=ptr08100

One regulator for each voltage; two PTH08080WAH for 3.3v and 5v and one PTR08100WVD for 1.9v. You can go further and have seperate 1.7v and 1.5v lines to power the CPU and GPU separately, which allows for more play time on battery.
viewtopic.php?f=36&t=2844

 

[Crazy Inventor]

Are you positive you have to polarity correct when wiring to the GC's power brick?

I'll check it and redo it again tomorrow when I have time and I'll back to you about it. And I'd rather not make a regulator unless that's the only way to power both of these off the same source.

Thank you

 

[Crazy Inventor]

So after testing with some different power supplies, I'm beginning to think that the amps output is what is causing the problem. The GC supply outputs at 12V DC and 3.25A, the car adapter, a Prestigeline AC adapter outputs 12V DC at 700mA, this one works with the screen. I tried my old hauppauge pvr supply which outputs 5V at 2A. Unlock the GC supply this on will turn the screen on, but it isn't enough to power the actual screen. It flickers like it's turning on, but the only thing that stays on is the power led. I didn't the amps really I affect electronics a long as the voltage as correct.

I will post a picture of how I have the GC supply wired to my screen just I case what it is faulty in some way.

http://imgur.com/0DyUWtX

The red wire is wired to the black cable with a white stripe and ground to the solid black wire. The fan and this wiring is for testing purposes only. When everything is wired it works fine, fan runs. But when I plug the cable into the screen even without turning it on, it stops, fan doesn't run.