How to Hack a DCH 6416 motorola cable box

SOURCE: No right channel audio when using HDMI connection to HDTV

Since it is easier to replace, I would go with the cable box first. Sometimes there are software upgrades for the TV's that fix such issues but, almost all HDMI issues are with the cable box not the tv.

SOURCE: motorola cable box remote codes

I have a panasonic dvr.. had the same problem. you can't go through the cable box to the dvr, you have to put in a splitter and have the cable feed it directly.

SOURCE: two tvs off Motorola DCH3416

If you have different input options on your TVs, you could run the second TV with the Y, Pb,Pr component outputs along with the analog audio from the STB. However, remember the STB will only support ONE output video format. So both TV will have to be set to the same video format (720p, 1080i, 480p, etc)

SOURCE: motorola dvr dct6412 locked channels

Check with your provider to ensure that you are in expanded services, or limited. Because being on limited services the box will lock you out of those channels. If you are in billing for those services and you checked the batteries on your remote and they are good and you get a solid red blink when you change channels not a double blink (indicating that your batteries are dying), Then try power cycling your DVR by, removing the power supply and waiting 3sec then plug it back in. Your box should shut off, turn itself back on, then go into the load screen, then, once the load screen display shows on your tv and on box display, wait for your box to completely load (don't touch nothing until the correct time shows up, meaning that it has completed the load process) Once the process is complete turn box back on and you should have you guide back up and (No Data) on your program schedule(Don't Worry!!) it will populate, with 15-20 mins.

Now try to ch. up and down and see if that fixed the problem. also make sure nothing is blocking the sensor. If all else fails and you changed the battery, called your cable provider and request a box swap, (be sure to watch all your recorded shows because they go bye, bye with the cable guy!)

SOURCE: I have a DCT 6416

This happens because the receiver is no longer capable of detecting the presence of the channel and this is caused by the failure of the tuner. This is a hardware fault , the entire PVR must be sent to be repaired - the tuner will have to be replaced.
But i must say that this is the eight question related to a failed tuner that i got this evening in less than 2 hours. Has been a big storm or a big power outage) around you lately?