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This model has no headphone out put. In the rear panel there are two monitor audio outputs which could drive headphones, but I think the volume output to a possible monitor matches the tv loudspeaker output, and may not turn off the audio separately.
Lay the TV on a soft flat surface, then you just have to remove the stand and all the screws on the back, then the board mounting screws and connectors. Best thing to do is to take a lot of pictures so you will know how it goes back together. Mark the connectors with marking pen also.
Also look for any bad caps with domed tops when you are at it as well.
To connect as you describe you will need a tuner card as the 503MXE is a monitor rather than a receiver. Otherwise the only option is to connect a scart to the 5xBNC connectors (Input 2) but you will need to be sure that your digi box outputs RGB over scart. If you have the optional video card (PDA 5002) fitted then you can connect via the s-video connection (Input 3) assuming your digi box has an s-video output.
Very possible,but yet,this might be the manufacturer defect power supply which they will fix it for you free;but before we jump to this conclusion,you need to test it first:
-Unplug the power cords.
-Unplug the media video cable from the box to the tv.
-Check all the pins on the video cable are in place as well as the connectors both behind the TV and the media box.
-Reconnect the media box and TV with the video cable(DVI+VGA in one) and have at least a video component hook up to it(ex. dvd player/VCR or comcast box) be sure this video player is turn on and running,at the same time,be sure it is under the right video input.
If you have tried the above steps but still doesn't work,call 1-800-pioneer Tuesday-Thursday at7amPST and address your issue to them.
Let me know if you have any additional questions!