HP dv2000 display issue

I have a HP dv2000 laptop that had an issue with brightness. I ordered a replacement, installed it and it worked for a little bit then went dim again. I reseated the connection and it worked again for about a minute or so and back to dim. i then unplugged the lid switch, reseated the connection and powered it back up with it working. However now it will stay illuminated for about 5 minutes then it goes dim again. I can plug it into an external monitor and the monitor works fine, laptop will still dim after 5 minutes. I can also hit fn + f5 to put it to sleep and when I woke it back up it works for 5 minutes and cuts off. No discoloration on the screen. I don't see any fraying on cables, nor have i moved it during the time it works/quits working properly.