It is very unlikely that 3 WDTV units fail in the same way without there being some other envronmental factor.
So some questions-
When you do not see the display from the WDTV do you see-
a) a black screen
b) a blue screen
c) a screen with a message like No Signal
When this problem happens have you tried to reseat the HDMI connectors on both the WDTV and the SONY TV? Then restarted both devices. TV first then WDTV. (Just because a HDMI cable works some times does not mean it is a good HDMI cable)
When the problem occurs, have you cycled through the various input sources on the TV to make sure something on the TV end has not been reset?
When the problem occurs, have you used the WDTV component connection to see if something in the WDTV System>Audio/Video settings have been reset?
by reseating i think you mean to remove / unplug from TV and unit - so yes i have tried that numerous times
i have only 1 hdmi cable to try
3)it all looks ok to me - will have another relook
4)i have tried the white/ yellow / red cable from unit to TV - is that a component ? well it works that method and yes i had a look at the setting and toggled and tried a few different varients
Im just browsing looking for another issue with my In Laws Live plus, but this caught my eye…
If the Unit works initially then stops working, did you try it back on the SONY, and if so was it working, because if it is, then its not the boxes.
Edit - mmm getting confused with how many TVs you have got. Do you not have someone you know that could try it on their TV. The common factor is yout TV and the HDMI cable, 3 boxes cant be broken, or the odds must be astronomical.
I would go with the cable myself.
A friend of mine struggle for ages with his, it turned out that he had to cut down his HDMI cable end, as the inside of the box is known to cause problems, just trim off the connector that goes into the WD box, sometimes the connector can be iffy.
Yellow / White / Red connector is Composite, not Component, but it works just as well for the test that was suggested.
I agree with previous user (wdtvhub) that it has to be something else, either the HDMI cable or the TV itself. To rule out this you need to test the box on another television. Using composite or component will only tell you that those interfaces are working, but wont solve the issue of the HDMI, nor will it even respond to the question of where is the issue.
Connecting the unit to another television and with another HDMI cable will get you closer on finding the real reason as to why this is happening. As far as I know, if the interface of the HDMI on the Media Player was bad, it should send a “No Signal” on your television, not a black screen. So check on that and let us know.