HDMI no longer working as pass through for Comcast and Tivo

If that's happening on HDMI, check the component video output (red, green, blue plugs), and if that's not working, check the composite (yellow plug) output, and of course make sure the TiVo and video display device are in agreement on the resolution setting.

The TiVo Community Forum, a group of TiVo users (and not an official TiVo, Inc. site) is a good place to explore this issue in greater depth.

http://www.tivocommunity.com/tivo-vb/index.php?

Connect the Blueray player to the HDMI input of the TV. Use the TV's audio output to the receiver. You cannot do 7.1 using analog signals.

Are you using the HDMI for the Tivo and the Comcast box? If you do, then you need to verify that the HDMI sound set up at the boxes and at the TV are set to send and use the audio through the HDMI ports, not through the analog ports since HDMI allows you to use either analog audio or Digital audio through HDMI cable, you have to choose.
Please read the Tivo, Comcast box, TV setup for details.

Basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

To really help you would require a bit more detail. HDMI is the video part of the signal - the audio part may require additional cables. Also, source material may play a role. I'd start by seeing if you have some audio outputs from whatever your source is and connecting those to the Marantz. Beyond that, I'd need more info to be sure I was giving decent advice.

Hello First off i would determine if the same thing happens when the cable box is connected directly to the TV with the hdmi cable.

If the picture goes out get a new box from your cable company.

If it works fine then its time to call Marantz

My Denon avr 4310 does a similar thing and after a lot of research it seems that the problem is with how digital signals are sent through the HDMI cable and how the control board of your receiver processes those signals.

Here what I mean

HDMI is meant to simplify connections by transmitting video, audio and CONTROL signals through 1 cable.

The problem becomes when you introduce a "middleman" in this case your receiver the control signal doesn't always get interpreted correctly.

My TV has the capability to "turn off" the "control" signal coming through the cable if yours does try that first (i have a sharp 52" led) this solved some of the issues.

My receiver has the capability to accept different inputs and merge them so here is how I get around the problem.

1. I use HDMI for video signal but also use the optical for audio this allows me to send the "complete" hdmi signal through the receiver and to the TV this complicates things but also allows you to get audio through your tv speakers so if you want to watch something late at night you aren't waking people up when the receiver gets loud. This stopped things like the video flickering or turning off.

You will have to play with your menu's to see if you can do this on your unit.

How to fix this easily? Dump HDMI and use component (red, blue green RCA's) for video yes its still HD and yes you will have to run audio separately. but it eliminates all the digital processing issues that receiver manufacturers haven't worked out.

I was pretty upset when I spent $1500 for my Denon receiver and Denon then told me that HDMI doesn't always make anything better.

Hope that helps

Make sure you are using an IR cable to control the cable box from the tivo.
Repeat guided setup.

Have you hooked it up and just tried it. Comcast supports Tivo. If you do indeed have a scramble problem I believe there is a hack for it.

Remove the HDMI cable (out) to the speakers from the receiver.
Connect regular speaker wire from the receiver to the speakers.
Of course, remove the (now extra) HDMI cable from the tv.
That will remove the loop.

As far as I know, you need the cable cards to get HD through the Tivo, because they're what does the HD decoding and output.

I have the EXACT same problem with my Sony SDM-P234 23" HD/computer monitor. I know it works (and it works great) with my DVico PCI card with my computer. It outputs in 480i, 480 p, 720p and 1080i with clarity on a simple indoor RCA HDTV antenna. I get the same quality (1080i) picture for the same three seconds as does lewy. I can also add that the digital coaxial output delivers 5.1 audio to my amp and it stays on even after the picture cuts out. Please help.....Comcast sendsa 'technician' out to service it and...well....did I say he's a 'technician'? He changed the box twice and says it must be my equipment. I guess its an act of God that it works with anything else.... I mean....its been checked out by a Comcast 'technician' after all.