Did you use a new inverter or the same one from your old screen? If the old one was used that is more than likely why.
Originally Posted by LM3
I replaced the LCD Screen B154EW01 V.4 with a LCD Screen B154EW01...
No you can not do that. Like you said theres only one connection on the motherboard not to mention the onboard graphics arent designed to display that.You would also have to power another screen inverter somehow.
The lcd is more than likely an LG philips or a samsung just get another 15.4 inch wxga+ samsung or lg philips panel from ebay. All those panels have the same connector size it doesnt have to have that specific part number