M6500 RGB LCD Screen issue, HELP really really stuck.

Hi All

This is my first post and any help would be really appreciated as I'm totally stuck and sorry for the long post.

I have a fully working M6400 with a nvidia fx2700 and a wuxga CCFL screen.
I also have a fully working M6500 base with an ATI m7820 and no screen.

I want to finish off my M6500 and add a screen but I have tried and failed and have a problem.

First off a while ago I decided to upgrade my M6400 and add an ATI M7820 with RGB screen. I got the GFX card and fitted it and it worked perfectly with the older CCFL screen however when I tried to fit the RGB LED screen there was a spark from the flex cable to the gfx card and the PSU tripped. I tried again and same thing. I then tried the older screen and the backlight would not come on but I could see the faint outline of the desktop on the screen so the gfx card was still outputting but was now not switching on the backlight. I put the old gfx card in and tried the new screen again and the same thing happened so I came to the conclusion the RGB LCD screen had a fault causing a short and so put the older screen back. Luckily the FX2800 was not damaged and the backlight came on. The RGB screen I tried was an LG171WU5 TLB1 and the cable was a 0G748F both of which are the correct parts according to my research.

Now to my current problem. I wish to finish off my M6500 with an RGB LED screen. I have sourced a LG171WU5 TLB1 from a different supplier another ATI M7820 and a brand new ORY89F cable which again according to the internet should all work together. However, when I attached them to the base exactly the same thing happened as it did with the M6400. There was a spark from the gfx card connector to the flex cable and the PSU tripped. I was gutted. In desperation I tried the screen from my M6400 on the M6500 and again the backlight didn't switch on but I could see a faint outline of the desktop. I tried the new screen on the M6400 with another new 0G74F cable and same spark and psu trip. I am truly at a loss.

I now have two expensive RGB LED screen which I don't know if they work or not. Two ATI M7820 cards which appear to have blown in some way and no idea what to do next.

Does anyone know what I have done wrong? any help would really be appreciated.

Many Thanks
Jonathan

 

Just going to throw this out there considering it's sounds like you're fairly technically proficient, but you removed the inverter before trying to connect the new LED screens right? The CCFL screens use an inverter, whereas the LED technology doesn't require them

 

If you keep on frying the LVDS cable, you might have a short somewhere on your motherboard, probably caused by the first short.