Comcast HD probs with LG 60" plasma

[prof]

Hi,
I just got a comcast HD box for my LG 60" plasma TV
and it seems to work pretty well except that whenever
the comcast HD box changes format while watching a channel
(i.e switching automatically from 1080i to 720p for whatever reason)
the video connection between the TV and the HD box
gets lost and the TV turns off. This usually happens 2
or 3 times an evening and I'd very much like to find a solution.
It doesn't happen at all with non HD channels.
Any ideas?? Comcast has been useless.
Also the signal path is Comcast HD box connected via HDMI to
my Yamaha vx-571 receiver and the TV connected to a HDMI
out of the receiver. Thanks for any suggestions.

[space-time]

no idea why the box would swicth resolution out of the blue. Can you try to by-pass the Yamaha receiver, make sure the problem is between Comcast box and TV, and has nothing to do at all with the receiver? then you may want to try AVSforums

[C(-)ris]

Probably the receiver. Something to do with the HDCP handshake I'm sure. You can thank the MPAA who pushed HDCP down consumers throats for the problem.

[prof]

space-time wrote:
no idea why the box would swicth resolution out of the blue. Can you try to by-pass the Yamaha receiver, make sure the problem is between Comcast box and TV, and has nothing to do at all with the receiver? then you may want to try AVSforums

Yeah i've got to take up the random resolution dropping with Comcast.
Wish me luck. :banghead:
And I will have to try taking the receiver out of the equation to see if
it still happens.

Thanks,
prof

[Carm]

Try switching your box to only output 1080i/p or 720p instead of auto. Worked for me.

[Bimwad]

Basic troubleshooting 101 -- what occurs if the box is connected directly to the TV? With a different cable?

If the issue remains, it is likely a firmware/compatibility issue between the two components. One, or both, may be at fault.

The suggestion about forcing the box to output a set resolution is probably the best solution, and not uncommon. Unfortunately, from what I recall, the solution was to use the lower resolution.

[Chakravartin]

C(-)ris wrote:
Probably the receiver. Something to do with the HDCP handshake I'm sure. You can thank the MPAA who pushed HDCP down consumers throats for the problem.

I wouldn't immediately blame it on HDCP.

I suspect that the receiver is entering some sort of power-saving mode on a hair-trigger.

But the solution is the same.

Bypass the receiver. Connect the cable box directly to the TV.

[C(-)ris]

Chakravartin wrote:
[quote=C(-)ris]
Probably the receiver. Something to do with the HDCP handshake I'm sure. You can thank the MPAA who pushed HDCP down consumers throats for the problem.

I wouldn't immediately blame it on HDCP.

I suspect that the receiver is entering some sort of power-saving mode on a hair-trigger.

But the solution is the same.

Bypass the receiver. Connect the cable box directly to the TV.
The fact that it only occurs on HD channels is what I keyed in on. The HD Channs are the only encrypted ones.

[Chakravartin]

C(-)ris wrote:
[quote=Chakravartin]
[quote=C(-)ris]
Probably the receiver. Something to do with the HDCP handshake I'm sure. You can thank the MPAA who pushed HDCP down consumers throats for the problem.

I wouldn't immediately blame it on HDCP.

I suspect that the receiver is entering some sort of power-saving mode on a hair-trigger.

But the solution is the same.

Bypass the receiver. Connect the cable box directly to the TV.
The fact that it only occurs on HD channels is what I keyed in on. The HD Channels are the only encrypted ones.
Yeah, but cable boxes always lag when switching to 1080p and between 1080p channels. I've seen the screen go dark for 3-4 seconds on my mom's TV when changing HD channels. ('Can't reproduce it here, I don't get cable tv anymore.)