Mac Mini + Shapr Aquos: Signal is not compatible for this input

[rnkc123]

I am trying to get an Intel based mac mini to display on Sharp Aquos LC-45GX6U TV. I am using a dvi-to-dvi cable.

When initially connected, it worked fine, outputting at 1280x768 at 60Herz. It is not the native resolution for that TV, but close enough to display OK. I tried to play around with resolutions and as soon as I switched to another res, the TV showed a black screen with a message "signal is not compatible with this input". The funny thing is that when restarting the mac, it shows the boot screen fine with 1280x768 at 60hz shown in the right top corner of the TV. However, as soon as it boots, it goes back to the black screen with the dreaded message.

I have tried connecting other monitor(s) and TVs (all of which work fine) and then changing the resolution back to 1280x768, then reconnecting to Sharp Aquos. It doesn't work.

I have tried clearing PRAM and NVRAM - it doesn't work. Still gives the same message.

I tried deleting plist files on the mac (which supposedly save monitor settings) - it doesn't work.

I tried booting it in safe mode and it worked worked, if you reboot in normal mode, it goes back to the dreaded messaged. I then tried going back to safe mode and playing with resolution there. Once I did this, it showed the black screen with the message in safe mode and now the safe mode does not work either.

Please help!

 

[mpshay]

Is your TV only a 720P set?

 

[rnkc123]

No, LC-45GX6U supports 1080p. Either way, my goal is to make any kind of picture to show... I don't care if it is 720p or 1080p at this point.

 

[crazzyeddie]

Are you using a DVI-D cable or DVI-I? You should use a DVI-D cable to make sure you're forcing it to use the digital connection, not analog. There might also be a setting for this on your TV.

I have no problems at all with my Sharp 1080p set using a DVI to DVI cable. It even shows up under Monitors with its own color profiles and runs at 1080/60hz.

 

[bub9001]

I have had problems with my PC not Mac switching to 75hz when messing with resolution sizes. So this may be another thing to look at. I have the Graphics card displaying only resolutions that match the Monitors so it won't go to 75hz at all anymore.

 

[karl878]

Originally Posted by PC Magazine
As the LC-45GX6U is a 1080p display, we were surprised that it cannot accept a 1080p signal via the AVC's DVI or HDMI inputs. For the adventurous PC user, it has an undocumented and unsupported feature that lets the display operate at its native 1080p (at 60 Hz) resolution when driven by a DVI cable attached directly to the rear, bypassing the AVC altogether. Granted, the amount of native 1080p content available is rather limited and requires the use of a PC to experience, but one would expect a TV that's advertised as a 1080p display to accept 1080p input easily.

see, http://www.pcmag.com/article2/0,1895,1865478,00.asp

 

[rnkc123]

Thanks for the help. For now I solved this by connecting it with a dvi to hdmi cable, instead of dvi-to-dvi. Can't get the sound that way through the TV though, as it does not have a separate sound input on HDMI in.

 

[mpshay]

Are you using 1920 x 1080? Should be a better match for your 1080p TV than the 1280 x 768 you previously mentioned