I'm posting this here and on the sharp XXD64U thread, cause I can tell if its the Cable box, the TV or the monoprice switcher..........
I've had a 46D64U for about almost 2 years, usually I just deal with the problem, but now it finally starting to bug me quite a bit. Here's the layout. I use a harmony 890, I have (2) Lcd's, one's upstairs (46d64u) and one's downstairs (samsung a650). I have a TWC dcx3400 cable box. Its Hdmi output gets split by a monoprice 4x2 hdmi switcher (Product ID: 5312). From there (1) hdmi output is kept downstairs, is sent to an onkyo 875 reciver which up converts it to 1080p and sends it through a 50' hdmi cable, then to the samsung. I only use the reciever for sound downstairs, and everything works fine no problems.
Now the 2nd hdmi ouput of the switcher is sent through a 65' hdmi cable all the way upstairs to the sharp 46D64U. Now when I switching through the 4x2 switcher, the dvd, PS3 & Appletv are all fine, no problems. But when I go to the cable box the audio will completely drop out, changing channels or powering off wont work to restore and I'll get this message....."incompatible audio signal, please check your connection or device"
And the only way I can get the audio back, is by accessing the user menu of the motorola cable box, go into "additional hdmi settings" and changing the (3) audio options "AUTO", "THROUGH" & "L-PCM". The only one that will get the audio back is "L-PCM".
Now the problem with that is it wont stay permenantly. If i go back downstairs and start watching say an HBO movie in HD with dolby, the box will switch out of that and reset to "AUTO" and then the whole problem will start again up stairs. I've swicthed to an older cable box , the DCT3216 and the problem is the same, I've even replaced the DCX3400 and its the same. I also have the lastes firmware from sharp for the upstairs LCD. I can't run analog up stairs or change cable so I'm not sure what to do.
Would I have to convert the signal out of the switcher before it goes to the upstairs to analog, then back to hdmi? Also, if I leave it as L-PCM, that only means 2 channel stereo, correct? Or does that mean the dobly is decoded in the cable box then sent to the reciever? Would the reciever need to be on multichannel to recieve the L-PCM then send it to the separate channels?
All I want upstairs is 2 channel stereo, but I want dolby downstairs. Any help or advise would be appreciated.