Sorry to hear about your problem, I can help you today.
You can do a reset of the HDMI port, but if that doesn't fix it then you will need to replace the digital board. Replacing the board is not cheap and very very complicated. You don't need a special remote to reset the port, just the JVC remote that came with the Tv. Here is the procedure:
Before entering the SERVICE MENU, confirm that the setting of TV/CATV SW of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR/DVD SW of the REMOTE CONTROL UNIT is at the "VCR" side. If the switches have not been properly set, you cannot enter the SERVICE MENU. 1) Press [SLEEP TIMER] key and while the indication of SLEEP TIMER 0 MIN is being displayed, press [DISPLAY] key and [VIDEO STATUS] key (Fig.2) simultaneously. 2) The SERVICE MENU screen is displayed.
3) Select 2 for Self Check. Then turn the TV off, and after the fan turns off, unplug the power cord for 30 seconds.
4) Reconnect the power cord, turn the TV on and test the HDMI port.
If it doesn't work the first try, go ahead and try it a few more times. If you need further assistance please reply here. Don't forget to click the ACCEPT button if you find this information helpful, and keep in mind that the average price of an in-home Tv diagnosis is $125!
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PS3's are a pain to work with. Often you have to keep resetting the PS3's output to HD and back. I don't own a PS3, but have run into them at work. Here is one thing you can try: http://www.portfolioofpb.com/blog/ps3-blank-screen-switch-inputs-hdmi-to-composite-to-hdmi
Also get a hold of a dvd or bluray player to test on the Tv. It may be the Tv is ok.
The HDMI port can get disabled by shining a flashlight on the back of the Tv near the HDMI port. It's a "feature" thought up by JVC to prevent someone from running the Tv while it's open (exposed to light).
I've had to perform the reset procedure 3 and 4 times sometimes to make it "stick".
Yes, it can be reset successfully and still have a defective board. The only fix then is to replace the board. Here is the part you need: http://www.encompassparts.com/products/?SRP0D045A-M2-R The installation is very difficult. If you fudge a connector, you are screwed:
Remove lamp door.
Remove rear cover.
Remove metal cover where the inputs are.
Remove screws, unplug some connectors, and slide the entire chasis out.
Disconnect several connectors to the Digital board.
Remove one screw holding board in and take out board.
Separate board from daughter board/bracket.
Install new board and re-assemble.
After Tv is completely re-assembled, plug in and power on.
Perform the HDMI reset procedure.
Do not shine a flashlight near the back of the Tv.
Do not put the back of the Tv near a big open window where light can shine in on it during the day.
Test HDMI port.
I wish you good luck (no joke)!