I need some help with troubleshooting. I just got a 50" panasonic VT25 and I had to also upgrade my Comcast digital cable box to the HD version to take advantage of the HD content (this is my 1st HD TV).
When I initially had the HD cable box hooked up via a 1.4 HDMI cable, intermittently, but fairly frequently, when I changed the channel, the image would flicker and give a high pitched "erp" sound as the channel switched. If the channel change happened slightly slower for whatever reason, there was no problem. Exchanging HD cable boxes and trying different HDMI cables didn't make a difference.
When connecting the HD box using the component-out to the TV, there's no problem. When using the non-HD box connecting via a coax cable, there's no problem.
So it was looking like it might be the new TV that was the problem... but I called Comcast. The rep didn't really think it had anything to do with the cable signal but they reset the cable box remotely (their solution for everything), and it actually made a big difference (though it did not solve the whole problem). Now there's only some flickering of the picture when I change channels, but only when I'm on HD channels and it happens about 20% of the time or so. The annoying sound is gone.
So my question is: could there still be something wrong with my new TV? Should I buy some expensive cables (I've got the cheapest 1.4 HDMI cable I could find at Fry's and the coax is the same old one that Comcast installed in 2004)? Should I have Comcast come out and try to improve the signal? I'm not really fond of the idea of exchanging the TV; it'd be quite a headache and since the problem improved with the reset of the cable box, my suspicion is that it might not be the TV.
Thanks in advance,