I am having trouble trying to figure out why I don’t get 5v on pin 18 of the HDMI port. Without that, the monitor doesn’t recognize the console is connected. The only place I can find continuity for pin 18 is on the inside side of that little cap next to that NFD esd chip. I don’t know how else to test what might be wrong when I can’t put the board under power while it’s outside the rf/heat shielding.
The story of this board is that it came in with a bad HDMI port. Traces were ripped, so I had to repair those. I tested with my tail insertion tester, and noticed OL on pin 18, but I decided to test it anyway. I plugged it in to a monitor, and no picture. No response from the monitor either. I then tested pin 18 for voltage, and it reads about 0.8v. I disassembled down to the board again, and I thought I noticed a chip on the NFD esd chip, and that’s where pin 18 connects. I pulled a replacement from a series S I had, and replaced it. No change. I then decided to buy a new one, and no change from it either. That’s when I replaced the power switching chip. The 2161 chip next to the esd IC. I still got 0.8v. at this point, I’m assuming that I’ve got a dead short somewhere, but I can’t find anything. All the caps seem fine. I get no shorts anywhere I think of checking. Normally, this is where I would try freeze spray, and inject 5v on the output of that switching chip. That can be destructive though, so I decided I would ask if there’s somewhere else I should be looking.
Any suggestions would be helpful.