PSone LCD in PC has horrible quality... Any ideas?

riva16 · Post by **riva16** » Sat Jan 07, 2006 8:31 pm

Hi. I installed a Psone LCD in my computer to view my desktop on and have a switch to change between my S-Video output on my video card with a RCA input on the front of my case. Anyway, to power the LCD I used a car adapter... or 12v - 7.5v, made for PSone by the way. Well, everything works, but quality is horrible. It reminds me of a very bad RF signal. I thought it was the 12v - 7.5v adapter, but when I use the power adapter, 110 - 7.5v, it doesn't work at all... One didn't work, and the other totaly distorted the screen to the point pink and green lines were scrolling. It didn't work at all... I got a loop somewhere... Any ideas? Thanks,
Kyle

Post by **marshallh** » Sat Jan 07, 2006 9:08 pm

Is your power supply unregulated? Get out your meter and see how much voltage is coming out of the 7.5v leads.

You might just use a 7808 off your PC's 12v rail and that would solve the power supply issue.

sniper_spike · Post by **sniper_spike** » Sun Jan 08, 2006 7:51 am

Right. Steal it off one of your PSU's 4-pin molex connectors.
http://www.gamesx.com/hwb/co_BigPower.html

Cheap transformers (power adapters) usualy don't supply very steady voltage, and with digital units like LCD screens, thats a no-no. But you're using the official PSone adapter, so that's rather odd.

riva16 · Post by **riva16** » Sun Jan 08, 2006 9:29 am

Its also rather odd that I AM pulling off the PSU's molex connection. So, powered off PSU directly, into an official PSone LCD 12v - 7.5v adapter, soldered directly to the 7808 on the board. I was thinking it might be becuase I'm patching th epower off a line that runs a drive, or moving motors... These motors could be introducing noise into the LCD. I dunno...
Kyle

riva16 · Post by **riva16** » Sun Jan 08, 2006 10:11 am

I'm such an IDIOT! Ok... The LCD in my PC is for viewing my desktop when I need it, and it's also been patched off, complete with SP/DT switch, to a compsoite RCA input ont he front of my case. Well, to input composite I';m using the "ribbon" cable that plugs into the bottom of the LCD PCB... Long story short, I followed the pinout fromt his forums sticky, and I had the composite ground connected to pin 5 instead of pin 4... There was my problem! All fixed. I just have to go through hell getting it all back in! All good now!
Kyle