Answer to "No video signals by the ps4's hdmi port"Most likely it will need an HDMI port or the ic chip. The emi filters can go bad as well , components and traces need to be tested for continuity. Here is a picture of these components https://asappcfix.com/pix/emi.jpg. The ic chip and emi filters are located on the opposite side of the motherboard under the heat shield. You will need about 480 to 500 degrees Celsius to remove the shield. Here is a photo of that as well https://asappcfix.com/pix/emi-s.jpg. If you are not up to the repair, visit https://WWW.ASAPPCFIX.COM/PS4.HTML for professional repair options.