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Need to know more,what do you see on the screen?
if the lcd was faulty there would still be sound.
if you have changed the av board have you checked the voltage supply to it? have you checked all the visible electrolytic capacitors on all boards for bulging or leaking?
Connect the Panasonic to one of the AV inputs on the Onkyo. Use red white and yellow AV cables. Connect the output from the Panasonic to one of the five AV video inputs on the Onkyo (or use the DVD dedicated input in the Onkyo backpanel). I indicated this option using red arrows. You can use any of the AV inputs or the DVD input at the bottom. Just ensure you do not connect to an output at the back of the Onkyo.
Alternatively use component cables and optical audio input, as indicated using the blue arrows in picture below. Select source and listen surround from the Onkyo.
There are more options. In some case you may decide to connect the DVD video output to TV and the audio to the Onkyo.
it goes into that when something on the board is loose like a diode or transister unscrew the bottom behind the tv then check the solders if thats not the case there are fuses that blow and that can happen as well dont mess around near the power supply or picture tubes cause that is were the most dangerous spot to touch is use a non conductive object to see anything.
In order to get any of the Freesat channels, you need to connect a Satellite dish to your TV. If you have a Sky dish, you simply need to run an extra Cable from the LNB from the dish and connect to your socket on the back of your TV.
In order to get Freeview channels and Analogue channels, you need to connect a aerial to the back of the TV.
There is a menu option for the TV to start straight to the AV input (your Sky HD box). It is Menu > Setup > Other Settings > Power on Preference. Select 'AV' for your TV to start on Sky HD.
Also even if you have your TV to start on TV, when you turn on your Sky HD box, it should automatically switch to the Sky box.
"I am also having difficulties in try to display the yamaha set up menu on the tv." According to the manual the display menu for TV will not work with HDMI hook up. I also have a Panasonic HD TV and can't get TV sound through my Yamaha AVR on "TV Sound" mode. Trying to use HDMI cable for this also. Do I need a digital optical cable or do I not have something set right?
I have had what is fundamentally the same problem. I have a desktop PC that I am plugging in to my Panasonic Viera TX-32LZD80. I am using DVI connection plugged in to HDMI port.
The solution is fairly simple; use the Menu button on the TV remote to get to the Main Menu for the TV and then select Setup which should be the fourth of four options. This will get you to the Setup Menu for the TV for the current channel. Look for the Picture Overscan option, it will very probably be set to On if you have the problem of %5 or so of display being missing on all sides.
Switch Picture Overscan to Off.
This immediately should solve your problem. A note of warning on this is that I suspected this was the problem but when I first looked at the Setup Menu I could not find the Picture Overscan option.
If you are unable to find the Picture Overscan option then trying fiddling with the Aspect settings. You will probably find it set to Auto. Switch it to 16:9 and you should find the Picture Overscan option will be available from the Setup Menu.
The tubes are aging and the grey scale has to be reset, enter service mode and readjust all guns until you get a black and white image. ones done memorize settings and that should fix the problem
also it has come to attention that the seals are failing that hold the coolant. please also check that no coolant has dropped onto the signal board. it is highly conductive and corrosive, it can eat a track on the board and create the same issue as you are having.