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HDMI not working

I plugged in the Apple TV to my Hitachi 42HDS69 Plasma HDMI port with the HDMI cable I bought from the apple store and I got nothing. It works fine with component video but I would like to use the HDMI. I have seen a similar report in the forum for a Sharp TV. Any suggestions appreciated.

Apple TV

Posted on Mar 23, 2007 6:28 PM

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20 replies

Mar 23, 2007 6:57 PM in response to Marco Graziano1

I wonder if AppleTV is using HDCP?

Try unplugging the AppleTV, turning ON the TV, plugging in the AppleTV. That doesn't really make a lot of sense, since the AppleTV is designed to be always on, but it's worth a try.

Also, on my 37" Phillips, I had issues with the HDMI port until I installed a firmware update on the TV. Check the Hitachi web site to see if there's something new there.

Also, sometimes on my TV I have to unplug the power, then plug it back in to see and HDMI picture (not often, thankfully).

Mar 24, 2007 9:19 AM in response to Marco Graziano1

Same here with a Toshiba 50HP95.

The technical docs have the following suggestions:
- unplug and replug in the HDMI cable
- on the aTV remote press and hold Menu and ➕ simultaneously for 6 seconds to cycle the output screen resolutions from the aTV

Also, the Apple documentation states that there is no signal on component video if there is a HMDI cable plugged in - but this is not true, as you have probably already found out.

Still no solution for me, but I thought these might help you.

Mar 25, 2007 7:26 PM in response to pffli

Update:

I'm not sure whether it was the order I started them all up in tonight, whether it was the unplugging and replugging of the HDMI cable, the multiple reboots of the TV, or the blue streak I swore yesterday, but today the HDMI signal is now being detected by the HDTV just fine.

I gave the component video cables back to the DVD player, and now everybody is playing nicely in the cabinet.

We'll see what mood they are in tomorrow.

iMac G5; PB G4; MacPro Mac OS X (10.4.9) Newton 2100; NeXT slab

Mar 27, 2007 10:34 PM in response to pffli

on my samsung 61" DLP 1080p i am having similar issues...i unplug/replug the HDMI and the TV sees the video signal from the appleTV, then i switch to a different video source and the TV doesn't see the HDMI signal at all when i try to go back to it. basically, once i go away from that signal source i can't get the appleTV/HDMI signal back again unless i unplug/replug ..etc...any thoughts??

Mar 28, 2007 3:45 PM in response to wa

After months of waiting Ive just opened my apple tv tonight and it refuses to work with my Samsung 32 inch LCD at all "signal not compatible/no signal" or something to that effect! pressing the + and menu does nothing at all apart from getting a solid amber light.

Worst thing of all is that my cables are already sunk into the wall!

Looks like this dissapointing product is going to have to go back if I cant get it working!! 😟

Can anyone help? I've tried all the measures as above apart from the firmware option which I have no idea about.

Mar 31, 2007 9:54 AM in response to GPSHO

can't help, but i have the same problem with my samsung 32 inch lcd tv i bought in late 2005. the component cables work fine so i can use the apple tv, but "no signal" on the hdmi. the tv's hdmi port worked fine with my samsung dvd player. i've also tried two separate hdmi cables with the apple tv, and it still doesn't work. sorry, no idea regarding "firmware" updates.

Mar 31, 2007 10:41 PM in response to Marco Graziano1

HDMI is not working for me either.. and unfortunately, I have no component cables to test the other output with. My TV is a Sony Bravia KDL-40V2500. When I plug in the aTV I see the little "-"'s dispear at the bottom right corner, so it's sensing something.. but nothing else. Just a black screen. The status light on the aTV appears to be fine. This *****.. I have to return it now and eat the 10% restocking fee.

Apr 2, 2007 3:33 AM in response to fsacr

Sorry to hear yours isnt working. As I said, i didn't change anything apart from jiggle the TV attempting to get it off the wall (unsuccessfully) and switched it on in the morning and it worked. Needless to say this apple TV business if very weird. I would have thought HDMI is HDMI is HDMI, but clearly not.

Apr 2, 2007 12:27 PM in response to GPSHO

this apple TV business if very weird. I would have
thought HDMI is HDMI is HDMI, but clearly not.


HDMI comes in several revisions (up to 1.3 now) but the problem is more than likely related to HDCP rather than HDMI. HDCP (High Definition Content Protection) is a form of DRM that requires devices to communicate their purpose digitally to content providing devices. The intent is to prevent protected HD content from being passed to devices that can record it.

For instance, if your TV has a HD output & it is connected to a HD recorder, a source device digitally connected to the TV would poll it through the digital HD connection, discover it can record HD, & refuse to output protected digital HD content to it. (Optionally, SD content may be output.)

HDCP is proactive in that unless connected devices indicate they are not recorders, or that they will not output HD content to them, digital HD output is not enabled. IOW, HDCP allows source-to-display-device protected HD transfers, but that's all.

This means that any problem anywhere in the device communication chain can shut down digital HD output, greatly complicating troubleshooting efforts. It is also why resetting or power cycling devices in different orders can mysteriously set things right.

Annoying, isn't it?

Apr 12, 2007 5:26 PM in response to Marco Graziano1

My input is that HDMI is still a new technology even though it has been out for years. Your display may have the connections for the HDMI signal but does not mean it will recognize it immediately. Especially if you are going from one source to another. My pioneer elite has the connections but I need to specify in the settings if it is HDMI or not. It takes as long as 20-30 seconds for my picture to appear. Keep in mind that a HDMI cable carries both video and audio.

Dell Laptop Windows XP

HDMI not working

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