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Fault with main board. Damaged component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
First of all, make sure that the hdmi BLOCK setting is correct. This prohibits both hdmi inputs and the DVI from working. I didn't even know they existed so I replaced the YSUS board and then I found the settings were my issue all along. If the settings are correct then the most likely culprit is the YSUS board part number: BR36223601. It is a compatible card for your TV. There are several suitable subs for this board and it is a snap to replace. I found a like new board that works better than my original board for only $25.00. The heck with those rip offs for prices up to nearly $300... Good Luck.
The main board that has the HDMI ports on it. The numbers can be taken from the board itself. Once the board is replaced, you'll have to go thru all the setup menu's because the memory is on that board too.
I had a same issue with my Panasonic TH-42PV500B plasma television. I tried everything which is written above and can be found on different websites. Finally I decided to replace the HDMI Board itself. I was able to buy a used one on ebay, it was only 13 pounds with postage.It is relatively easy to remove this HDMI Board. You should just unplug the TV and remove all of the screws form the back which are fixing the back of the TV to the frame. There are plenty of screws. You should remove all of them! Remove the backplate of the TV. After this you can remove another metal plate from inside, which covers this HDMI board - 4 screws. After you can remove the HDMI Board - only one screw holding it to the main board. Replace the new one back and put back the cover plate and the back of the TV. And it is working. Panasonic 42 Plasma TV TH-42PV500B Part HDMI Board Order number: TNPA3626
You can try partstore.com or a cheaper solution is to go to ebay and input your model number for a search, there you might find refurbished boards and new boards that shops are selling for sets that had broken PDP panels etc.. (BAD LCD SCREENS)
You will need to contact Onkyo directly and request the board from the parts department. I was not able to locate a part number for this as we are usually requested to perform component level repairs for these units.
The only thing I could recommend is to return the board and get the right board. open the set and get the part number on the board itself. You cannot modify a set to work things it was not designed for without reprogramming the microprocessor. Good Luck