HELP! My TV (or STB) may have died, I don't know which.

I bought my tv (Sony KV-30HS420) 31 days ago from HHgregg (they have only a 10 day return policy). And the tuner (RCA ATSC11) over ebay used


Well here's the deal. When I output the TV Image via DVI-HDMI cable to my tv I get a blank screen. When I switch the switch on the back of the STB between 480i/480p/720p/1080i this is what happens:


1080i - nothing

720p - nothing

480p - lines/flashes

480i - lines/flashes but only on the left side of the screen (50% of the total screen, complete left side, right side is black).


IT use to do this:

720p/1080i - Displays Fine but slightly off center to the right by about 5-10%

480p - Display fine, centered.

480i - image displays only half on the left side of screen. Right side is blank.


When Using component cables everything seems to display the way it should and everything is centered properly. When Using Yellow video 480i displays fine. I haven't tested the S-Video.


Now here is the thing I am curious about. I had two of these OTA STBs and they both did the same thing as above (about the HD displaying off center and 480i being goofy thru the DVI-HDMI connection).


Since they both did the same thing I returned one of them and figured that it either is A) a bug in the unit itself, B) my tv's HDMI input needs tweeking in the service menu (never attempted to do anything), C) Both STBs were bad.


Regarding the possiblity of it being the TV why would the HDMI image be off center when recieving an 1080i or 720p signal?


Another possiblity is the cable. Perhaps it is faulty? If it is the STB then why does Component output work fine?


How do I test to see if the STB is bad or if the TV is bad? Since the STB was used and obviously has no warrenty, has anyone had any experience with SONY tech support? Do they offer in home diagnostics? Or do I have to ship the thing out at my expense (remember this thing weights 150 lbs.) to some "place" and be without my tv for weeks on end. Everything else works fine on the tv regarding movies and video games and non-hdmi television.


I would think the problem to be the STB but since both of the ones I had (same exact model) did the same thing I figured it was too much of a coincidence to be that both were bad. NOTE: I only bought 1 STB on ebay but the seller shipped me two for some reason. I took advantage of this to test both units before deciding which to keep. I was honest and sent back the other unit I didn't pay for.


Anyhelp with ideas on how to trouble shot this problem would be greatly appreciated. Thanks.