Need help from an expert

[Denverlatino]

Hi and thanks for reading, i found several broken portable DVD players laying around at a second hand place, they sell them for like 10 bucks, i bought one and it does turn on, it appears that the problem its on the laser, anyway i don't want to use this to play DVDs, my intention is to use just the screen to build a Mame cab with two screens, lucky for me it appears that the DVD player sends the signal to the screen, as i can see the apex blue logo and the open ,close,loading message, the player has a a/v output that appears not to be working, but i found the cables that sends the image from the DVD to the screen, (gnd,cvbs) so when i disconnect the cable, the apex blue logo disappears, sing of no video signal, but when i connect the yellow RCA to it i don't get any image at all, so i connect the cvbs back to the DVD player motherboard and i see the apex logo back again, my first thought its maybe its a resolution thing, since I'm using an ati 9500 card with an RCA cable,  i set the card to display 800x600 60hz on the regular VGA monitor, and 640x480 60 hz on the second display but still don't get an image, i might try quickres tonight to see if a lower resolution works, but the main question after all this is:
Can i connect a direct signal on this screen? the screen only has two harnesses one with cvbs, gnd and another with this
gnd,vgh,vee,vcc,vdd,vin,vss,gnd,ntpc,gnd.... i really have no idea what the main harness is all i know its it carries the power supply Cu's if i disconnect the thing , the screen turns off, i don't have and idea what the other words mean. any help its appreciated thanks allot.

[northerngames]

search the make and model of the unit and see what it is meant to display res wise and go from there.

[MonMotha]

From the sound of it, this display accepts composite NTSC video (or possibly PAL) on the one cable and a ton of different voltages on the other cable.  The ntpc signal sounds like a NTSC/PAL switch.  Generally one will be a logic high and the other a logic low.  Consult the LCD datasheet for all the various power requirements or just salvage the power stuff from the unit in question.  Note that you may need to AC couple the NTSC video, and it may need to be at non-standard signal levels.

For testing, try a regular piece of A/V equipment rather than the TV out from a PC.  PCs can have somewhat wonky TV outputs.

On most of these units, there is another small board that demods the NTSC video and outputs digital RGB which is what most TFT LCD units require.  You may find a chip on that board that you can pull a datasheet for to get additional info.

[Denverlatino]

search the make and model of the unit and see what it is meant to display res wise and go from there.

i did tried lowres yesterday with many resolutions and no luck, ill search for that info today

[Denverlatino]

From the sound of it, this display accepts composite NTSC video (or possibly PAL) on the one cable and a ton of different voltages on the other cable.  The ntpc signal sounds like a NTSC/PAL switch.  Generally one will be a logic high and the other a logic low.  Consult the LCD datasheet for all the various power requirements or just salvage the power stuff from the unit in question.  Note that you may need to AC couple the NTSC video, and it may need to be at non-standard signal levels.

For testing, try a regular piece of A/V equipment rather than the TV out from a PC.  PCs can have somewhat wonky TV outputs.

On most of these units, there is another small board that demods the NTSC video and outputs digital RGB which is what most TFT LCD units require.  You may find a chip on that board that you can pull a datasheet for to get additional info.

power its not a problem, im planning to use the motherboard to power the lcd, about the video, ill plug one of the av plug and play pacman controller i have to see if it displays the image, because the pc wont output anything.

On most of these units, there is another small board that demods the NTSC video and outputs digital RGB which is what most TFT LCD units require.  You may find a chip on that board that you can pull a datasheet for to get additional info.

the lcd has this small board that recieves the video, thats the one with the cvbs and  all of the voltage signal in it, its on the lcd itself separated from the mother board , i was hoping to do a simple hack like the one on a psone lcd http://www.bit-tech.net/modding/2004/07/07/psone_lcd/2 so ill post pictures to see if you can help me find those spots, thanks for your help

[Denverlatino]

For testing, try a regular piece of A/V equipment rather than the TV out from a PC.  PCs can have somewhat wonky TV outputs.

you where right, i tried the game controller and it work, also my dishnetwork box works too, pretty much anything works but the pc.  I even tried 2 diferent video cards with my home tv they  work, so i know its not the pc video card, it must be something i cant figure out any ideas on how to hook this screen to the video card will be apreciated, thanks allot.

[Denverlatino]

anyone? help please