Dvd player stuck in 'demo repeat mode'

Put the unit in dvd mode. then press and hold the stop and eject buttons. The display should read "demo off". Then the tray should operate normally.

follow directions from the owners manual. while unit is powered up, unplug power cord from back of unit - wait 5-seconds. Depress the DVD open/close button while re-plugging the power supply cord to the unit. LG splash appears onscreen and unit goes into re-set. you do not loose any of you programing or settings.

Did you have any luck? My LG is stuck in demo mode too. Menu button doesn't work, and keylock was on as default so I can't use the buttons on the TV itself.

press power button on tv,then scroll right to take it back to tv

hold the stop button on the receiver not the remote! for twenty seconds

hold the stop button on the unit for 5 seconds

The error code has a Nucleus Group and Number followed by an Error Code.
The Nucleus 2100 references
DS_HDD_Communication
Check the communication between the digital board and the hard disk drive by querying the device type of the device type of the hard disk.
The Hard drive 282206200034 is no $399.80 available from partstore.com which you can just drop in since it is formatted. If you can find a hard disk which is rare due to the small size no one buys, it can be formatted to just drop it in. You will need the hard drive ( 120GB ATA), the PC communication cable 312278590017 $22.75 and the Service DVD 312278590710 $36.96 which will allow you to format the hard disk for the unit. I would do this for you but you might have other problems with the system which can only be found with more diagnostics after the drive is installed. Or it could be a drop in and go.
For the unit which is stuck in trade (demo) mode,
Unplug the unit.
Simultaneously hold the Stop + Open close while plugging in the unit.

If pressing the stop button on the unit doesn't work, try unplugging the unit for a few mintues, plug it back in, then press and hold the stop button again, that always work.

I agree that this is not the most superior device on the market and sound is average, but it has many advantages that others just don't offer - small size, no complicated cables, unbeatable price and has a very nice appearance, makes all other look like dinosaurs. Untill all others catch up with that, I'm keep this...

This is what LG customer service will instruct you to do. I have a LG LDA-511:

1. Unplug your unit.
2. After unplugging, wait a few seconds then press and hold the power button (yes, while the unit is unplugged). This resets the unit.
3. Plug in your unit.
4. Press the eject button.

If the disc does not come out, then you need service from an authorized service representative.

I had a LRM-519 that would not get past a very dimly lit "hello" on the LED screen. I called tech support and was advised to make sure no disk was in the unit and turn off the power from the unit (not the remote) and unplug it from the wall outlet. While unplugged, hold down the power button for 30 seconds then plug it back in. This didn't work the first time, but after a few tries it worked for me. My unit hadn't worked for nearly 3 months prior to this. Good luck.

According to LG support, it would have cost $69 for labor plus parts to repair the unit. The main board/power board is $40.