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TWC Cisco 4640HDC with Sony Bravia LCD TV

05-11-2010, 11:59 PM
I have a new Sony Bravia KDL-46EX501 TV and just subscribed to Time Warner Cable Carolinas. They installed the Cisco Explorer 4640HDC using an HDMI connection.

The problem is that during power-up, MOST of the time, the box will display "480p" and the TV will display "Unsupported signal. Check your device output". Powering the box on or off at this point with the power button does nothing. The only way to restore the connection is to reboot the box using the power cord. Very annoying and frustrating!

TWC has replaced the box twice, and we've both tried different cables and HDMI ports on the TV. Sony and TWC technical support are clueless.

This seems to me to be the "HDCP handshake" issue that I've read about in various forums. If this is the case, that problem is still around after all these years? Anyone else experienced this with the 4640HDC? Any workarounds beside switching to component cables?

Thanks in advance for your help!

05-12-2010, 08:32 AM
Other than going to Component, the only other thing I could think of would be the TV may need a firmware upgrade.

05-12-2010, 08:49 AM
Switching to component for video is the best solution. It WILL deliver just as good of a picture but have no HDCP handshake to negotiate...

05-12-2010, 05:09 PM
That bug was fixed in a recent patch. Raleigh, NC is the first one to get this patch. They also updated the boxes to ODN v3.2.0_15 which adds some new features like the RemoteDVR manager which requires a myservices account.

05-12-2010, 05:10 PM
I'm sure Charlotte is testing the new patch right now. They already have ODN v3.2.0_15 but the patch should be coming out soon, so just hang in there.

05-12-2010, 07:27 PM
I went ahead and downgraded (?) to an older SA Explorer 4250HDC and the problem is gone. I will still be curious if the firmware update resolves the problem, so please post the results if you're testing it out. I'm sure others will continue to experience this problem.

The 3 TWC techs I worked with over the past 3 days were puzzled, but the sales rep at the payment office was quite familiar with this problem. He stated that he'd heard quite a few Bravia LCD owners complain about it.

I didn't want to go component even though I have the cables because I would've lost Dolby 5.1 capability from the cable box. I know it has an optical out, but I have an older Sony A/V receiver with only one optical in, and that's taken by the Blu-Ray player via the TV.

Thanks all for your input!