Recording problem After programming a show system fails to record and reviewing still shows the program to be recorded though in the past.

It sounds to me like you have a fault in the tuner circuit. I suggest you take it on for service.

one of the tuners isn't connected to a signal source, or is failing.

I would say yes, from what the manual says, the LG HT356SD has some Unique Features:

#1 Portable In : Listens to music from your portable device.
(MP3, Notebook, etc)

#2 USB Direct Recording : Records music from CD to your USB device.

Read the manual, on page 26 it will show you how to do it, I found it at www.theatresystem-manual.com under lg, or go directly to the link I provided.

http://www.theatresystem-manual.com/manuals/lg/LG_HT356SD.pdf

Recording to USB
1. Connect the USB device to the unit.
2. Select a DVD/ CD function by pressing
FUNCTION.
One track recording - You can record to USB after
playing the file you want.
All tracks recording - You can record to USB after
stop.
Program list recording - After showing the
programmed list, you can record it to USB.
3. Start the recording by pressing X REC.
4. To stop recording, press Z STOP.

Try to scan the DVD data into your PC using the trial version of TMPGEnc v4.0 Xpress if this can't find structure data then the recorder must have set the leadin data to show blank.

Make sure there is no time overlap on any of the programs you have on the recorder.

That is the most likely problem

It sounds as though the hard drive is about to go south on you soon and the receiver is going to need to be replaced however, in the interim you can change the options of the recordings and make it a default so that the recording continues past the end of the show. It is possible that extending this time will allow you to view the portion you want before it skips to the end. In order to do this press the guide button and select a program in the future. On the create timer screen select the option icon. You will now be at the timer options screen you can extend the time the recording will last after the end of the show and when it will begin recording prior to the show. I would also set this as your systems default so that it performs the same way regardless of what you are recording. According to the latest known receiver issues this is not identified as it is a common indication that the hard drive has an error internally. If this works I suggest that you have a replacement sent to you so that you do not lose the use of your DVR un-expectantly.Remember to watch all recorded events prior to replacement as you will lose that info when the receiver is swapped. Thanks for using Fix Ya.

i am not terribly familiar with these systems but there are probably two sattelite in ports on the back of the receiver, one is a line for watching one program or recording, the other strictly for recording, one of these inputs is probably no longer receiving signal

TiVO also plans for other upcoming shows in total recording time. So if you 12 hours recorded, and another 20 or so hours scheduled in upcoming all as don't delete, then it won't allow additonal shows manually