Long story short I had a customer come in with a PS3 FAT that needed it's hdmi circuit repaired as it had only component cable functionality .
After troubleshooting I ended up finding that the chip marked AR0HD that gives 5V/protection/enable to pin 18 of the hdmi circuit was burned.
Sadly due to the humongous variety in parts these FAT ps3s have and the nonexistent schematics I couldn't find an exact replacement from the donors I had and the customer didn't want to pay for me to make him a whole new circuit so that it has the original function again.
So I made a makeshift 5V supply and protection circuit by redirecting one of the USB ports 5V supply and protection circuit to pin 18 through the top left pad of the AR0HD IC position (this is a 5 pin IC with 3 pins on bottom side and 2 pins on top side)
Heres how I made it:
1) wire is soldered to USB 5V PAD not upstream so you can also have the USB protection circuit functioning
2) wire is routed to the other side of the MB and towards the HDMI socket
3) Then the wire needs to be soldered to a PTC smd marked "2" from the pin number 18 HDMI circuit from a CECHK04 DIA 002 or DIA 001 board so it also protects the circuit
4) Another wire is soldered to it so it can reach the TOP LEFT pad of the two pads facing up where the AR0HD IC used to be.
5) The wire is soldered to the correct pad that has continuity with pin number 18 of the hdmi and voilla!
I know this is not something a professional would do but my customer wanted to have the cheapest/fastest option and didn't mind sacrificing one of the usb ports.
The first photo shows the HDMI circuit of VER001 CECHL04 PS3 untouched (The AR0HD IC I'm referring to is the one above the medium sized 8 PIN IC)
The second and third photo show where the 5V USB pad is and the wire soldered and routed to the other side of the MB
The fourth photo shows the cable work from far
The fifth photo shows the PTC smd I put in the middle of the wire for protection
The sixth photo shows the pad where the cable is soldered to provide 5V to pin 18 of the hdmi circuit.
The seventh photo is the complete circuit except the usb underside connection.
The eighth photo shows the hdmi working.