Hi, I have an HP laptop (15-AC120TX). The display port on the motherboard which connects the motherboard to LCD monitor via LVDS cable is not working. I showed it to many repair shops and they told me that my laptop\’s discreet graphic card is busted(AMD R5 M330). Since the display port was connected with GPU,it is not working. However when I connect an external display with HDMI, I am getting a video output. I cannot figure out what is the issue.