Originally Posted by tuffluck
Originally Posted by Bob_Collins
Try a different HDMI cable maybe? Or, at least until you can determine if the problem is the TV, AVR, or cable, bypass the AVR and go from the cable box directly to the TV. If it goes purple when plugged directly into the TV then it is either the TV, the cable, or cable box. You then need to isolate it further until you know which device is the problem. Cable company should provide another cable box at no charge, so getting that swapped out shouldn't be a big deal. If it comes down to being the TV, it could possibly be something going on with HDMI handshaking I suppose,
Again, I would probably do the following in order:
- Different HDMI cable
- Different HDMI input on TV
- Bypass AVR and plug directly into TV
- check to see if there is any setting on the cable box which might be causing it to happen
- request replacement of cable box from cable company (or swap cable box from elsewhere in the house)
So it went purple this morning...first thing I tried was to turn off ONLY the TV, and then turn it back on. Viola, the screen wasn't purple. Seems like it's pretty certain the TV is at fault wouldn't you think? It's weird that if I switch devices on that same input--without turning the TV off--the screen doesn't go purple until I plug the cable box back into that particular HDMI input though.
Maybe the TV just really doesn't like the cable box, is that possible?What do you guys think? Also I don't know what handshaking is, is that fixable or do I need to go through warranty?
The awesome part is that I'm 34 days since purchase from paulstv, so i have to go through warranty and can't get a replacement.
HDMI HDCP (copy protection) is required by the movie and TV industry. The display device must constantly check to be sure that HDCP requirements are being met. Each of those checks is called a handshake, and with each and every handshake there is the potential that something can go wrong anywhere in the signal path from the source (cable box or Blu-ray player for instance) to the display including the HDMI cables themselves.
You've gotten basically the same "thoughts" or "suggestions" from me and from Bob_Collins. The first thing you need to do is learn what a handshake is, and how it works.
Actually there is another first thing you need to know. HDMI is not a hot swappable connection. The two devices that are connected by a HDMI cable should be OFF before you change HDMI connections.
Again, based on what you have described I think your cable box is more suspicious than your TV, but it may just be your setup which includes the settings that you're using in your cable box and your TV.
Here is an explanation from Bob Pariseau
about HDMI handshakes. He is discussing a setup that includes a Denon AVR and an OPPO Blu-ray player, but the handshake explanation applies to any setup. The point to remember is that it's much more likely that your problem is in your setup than that it's a defective TV.
HDMI handshakes will happen multiple times as you try to start a movie -- as the format of the audio and video content changes between previews, menus, warning screens, and the feature film itself. You can't make the handshakes go away -- it's just the way HDMI works, and HDMI copy protection is finicky about that. The minimum time for an HDMI handshake is about 2 seconds due to delays built into the protocol to allow the devices at both ends of the cable to get their act together. So if your handshakes are taking longer than 2 seconds you can kind of count the number of retries that are happening. For example, if you are seeing 6 second handshakes you know you are seeing the original try plus two additional retries. The goal is to get rid of the retries.
The Shocking Pink video is a type of handshake failure where the devices at either end of the cable get confused about whether RGB or YCbCr video data format is being sent. Setting an explicit output data format is the best way to minimize that chance. Handshake failures -- particularly ones where HDMI HDCP (copy protection) is unhappy -- result in "muted" video output while the retry takes place. Depending on the hardware the video will be muted to black or -- for some devices -- to a green screen. Again, this is just a symptom that handshake retries are happening.
And to repeat again, HDMI is an end to end protocol. So things that might look like confusion between the OPPO and the Denon *MIGHT* actually be due to settings in the Display which complicate the handshake. Sometimes it's purely a matter of trying stuff to see what makes a difference.
It would be helpful to know if your HDMI cables are "high speed" and how long they are as well as what gage (AWG).
Please don't swap HDMI cables with the power on.