High Def Forum
Thank you for visiting. This is our website archive. Please visit our main website by clicking the logo above.

Vizio and Comcast HDMI connection

Lindsey
12-05-2007, 01:38 PM
I need help in getting my Vizio VX37L 37 inch LCD TV to work correctly with a Motorola HD Dual Tuner DVS model DCH3416.

It is connected via a HDMI port. About 30% of the time when I switch from a standard channel to a high definition one I get the message 'No Signal' moving across the TV screen. I can switch back and forth a couple of times and eventually I get reception on the HD channel. Also, sometimes I get a messed-up(static/pink) screen on the HD channels which corrects itself after a minute or so. Comcast has changed both out both the cable and the Motorola box with no luck. Comcast is now saying that the problem is with the HDMI port on the Vizio but I am not convinced since the standard channels are working fine.

I am at a loss and any suggestions would be appreciated.

BamaPanda
12-05-2007, 05:42 PM
I need help in getting my Vizio VX37L 37 inch LCD TV to work correctly with a Motorola HD Dual Tuner DVS model DCH3416.

It is connected via a HDMI port. About 30% of the time when I switch from a standard channel to a high definition one I get the message 'No Signal' moving across the TV screen. I can switch back and forth a couple of times and eventually I get reception on the HD channel. Also, sometimes I get a messed-up(static/pink) screen on the HD channels which corrects itself after a minute or so. Comcast has changed both out both the cable and the Motorola box with no luck. Comcast is now saying that the problem is with the HDMI port on the Vizio but I am not convinced since the standard channels are working fine.

I am at a loss and any suggestions would be appreciated.

Have no idea, but the answer might be good to know. I am on Direct HD, and I at times will get that on the new bedroom set. There is a signal, of course - as it comes right on. When I go back and hit the 'format' button on the Direct remote - the 720P, 1080i etc. will pop up.

cheezz
12-05-2007, 07:02 PM
Handshake prob maybe? Try component cables.

mdw123
12-06-2007, 07:31 PM
had the same problem with fios after i changed the setting on the stb from 720p to 1080i. I only had the vizio tv for a day and thought the set was bad and was going to take it back. But I wanted to be sure so I unpluged the stb and moved it to my hdtv in the game room it worked fine no problem. took it back to the bedroom and conected it to the vizio tv and it worked fine, thats when i noticed the stb reset itself back to 720p when it was unpluged. have not had a problem with the pink snow or the no signal since

charlesroast
01-14-2008, 11:33 AM
I had this same problem with my Vizio. First time, the comcast tech replaced the HDMI cable. That got rid of the pink lines. I still had the problem with the "no signal" screen. The tech told me to turn the power off and then back on. This worked fine, but I shouldnt have to do this in order to view my HD channels. Another tech came out and tried 2 more motorola boxes all with the same result. He then used components for all of the boxes and had no problems at all. That makes 3 boxes that worked fine with components and not so good with the HDMI. I would like to use HDMI to free up some connections, so I am still trying to resolve this issue. In the meantime, components are being used.

tipstir
01-14-2008, 12:39 PM
I had this same problem with my Vizio. First time, the comcast tech replaced the HDMI cable. That got rid of the pink lines. I still had the problem with the "no signal" screen. The tech told me to turn the power off and then back on. This worked fine, but I shouldnt have to do this in order to view my HD channels. Another tech came out and tried 2 more motorola boxes all with the same result. He then used components for all of the boxes and had no problems at all. That makes 3 boxes that worked fine with components and not so good with the HDMI. I would like to use HDMI to free up some connections, so I am still trying to resolve this issue. In the meantime, components are being used.


If you have one of those boxes in the OP also or do you have DCT 6416 box? Do you have another HDTV in the place where you are that you could try the HDMI on that set..

Scottnot
01-14-2008, 01:05 PM
That makes 3 boxes that worked fine with components and not so good with the HDMI. I would like to use HDMI to free up some connections, so I am still trying to resolve this issue. In the meantime, components are being used.
As others have said, it certainly sounds like a handshake problem; in which case you have two possible solutions:

1. Try setting the output of the STBs to 720p; sometimes this may work.

2. Stay with component cables.

z28rod
01-14-2008, 03:50 PM
1. Try setting the output of the STBs to 720p; sometimes this may work.

2. Stay with component cables.ditto

MachVI
02-06-2008, 11:00 AM
I work on the software for a major consumer electronics company and our devices output HDMI. After a few customer complaints, yesterday we went out and bought a Vizio TV to test with our product. I would almost guarantee the "black screen" problems are with the TV. This TV handles the HDCP (copy protection) handshake like no other TV I've seen - it sends a bunch of conflicting messages (disconnect, connect, disconnect, connect) to the host device whenever you bring the TV out of stand-by mode. It's no wonder a lot of devices get confused by this abnormal and unexpected sequence of events. Based on my analysis yesterday, I will never buy a Vizio unless it's from a place like Costco that is very good about taking it back if it doesn't work with my equipment.

DaveGu
02-06-2008, 02:08 PM
I work on the software for a major consumer electronics company and our devices output HDMI. After a few customer complaints, yesterday we went out and bought a Vizio TV to test with our product. I would almost guarantee the "black screen" problems are with the TV. This TV handles the HDCP (copy protection) handshake like no other TV I've seen - it sends a bunch of conflicting messages (disconnect, connect, disconnect, connect) to the host device whenever you bring the TV out of stand-by mode. It's no wonder a lot of devices get confused by this abnormal and unexpected sequence of events. Based on my analysis yesterday, I will never buy a Vizio unless it's from a place like Costco that is very good about taking it back if it doesn't work with my equipment.

Wonder if Vizio is aware of this and can it be fixed with a firmware upgrade? This is if the firmware is upgradable.