Author Topic: TV / AV Receiver HDMI Turn On Synchronization  (Read 1910 times)

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Online xrunner

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TV / AV Receiver HDMI Turn On Synchronization
« on: May 19, 2017, 01:56:32 am »
About 3 months ago I had to replace my old Sanyo plasma flat panel with a new Samsung LCD/LED flat panel. It's connected to my Yamaha AV receiver via HDMI of course. I got the Yamaha in 2012. It's controlled with a Logitech Harmony 650. Never had any sync problems at all.

It's not a huge deal, but about every so often when I turn on the system since the new TV, the TV does not receive a signal and displays "no signal present". To get the video I have to turn off the Yamaha off then turn it right back on, then all is well. That is the only problem I have with the system now and it's only when the system is being turned on.

The harmony turn on sequence is

Cable box
TV
AV Receiver


I guess I could try and change the sequence, although it wouldn't be obvious that it fixed the issue until I tried it for several days. But what I want to know from you guys is, should the turn on sequence matter at all? I wouldn't have thought so,  since I would assume that there is a syncing protocol that the designers of HDMI built into it, but I am not an expert on HDMI.

Oh and I did obtain a new HDMI cable but that made no difference ...
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Offline Someone

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #1 on: May 19, 2017, 02:57:08 am »
But what I want to know from you guys is, should the turn on sequence matter at all? I wouldn't have thought so,  since I would assume that there is a syncing protocol that the designers of HDMI built into it, but I am not an expert on HDMI.
Get ready for pain:
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Offline sokoloff

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #2 on: May 19, 2017, 10:52:55 am »
HDCP is a pain for sure.

I'd put the sequence as TV, cable box, receiver. You could also test if changing HDMI inputs and then changing back on the receiver is enough to resync HDCP and show a pic. That might be faster and easier than a full power cycle.

There are HDCP strippers available, but I don't think I'd go down that path just yet in your case.
 

Offline NiHaoMike

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #3 on: May 19, 2017, 03:32:39 pm »
If both the TV and receiver support HDMI ARC, maybe try connecting the cable box directly to the TV?
A HDMI splitter can also help. Even the ones that do not strip HDCP renegotiate it.
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Offline German_EE

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #4 on: May 19, 2017, 07:42:33 pm »
I've had a similar issue and the cure was explained to me quite clearly, before turning on an HDMI signal source it's destination should be available.

So.......

TV on first so that all of the HDMI sockets are active

Then the AV receiver, this will see that the HDMI out ports have a destination (the TV)

Then the cable box, the playstation, the computer etc. These will see an active destination (the AV receiver)

I've been doing it this way for the last four months and never had a problem. In my case I don't have an AV receiver but I do have an HDMI switch on the back and working backwards like this stopped all the silly problems
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Online xrunner

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #5 on: May 19, 2017, 10:50:05 pm »
Get ready for pain:
https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content_Protection
HDMI was a great idea, and then DRM got in the way.

Ouch ...  :(

I'd put the sequence as TV, cable box, receiver.

TV on first so that all of the HDMI sockets are active

Then the AV receiver, this will see that the HDMI out ports have a destination (the TV)

Then the cable box, the playstation, the computer etc. These will see an active destination (the AV receiver)

Alright, I'm going to re-order the devices. I'll go with German_EE's ordering first -

TV
AV Rec.
Cable Box

We'll see what happens.

By the way the Harmony software is a piece of junk.  >:(
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Online xrunner

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Re: TV / AV Receiver HDMI Turn On Synchronization
« Reply #6 on: May 22, 2017, 02:54:20 am »
So far so good!  :-+
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