Concertone zx75 dealer didn't supply manual; have no idea how to work dvd function

Sounds like maybe your antenna is not connected to your radio.Might have came loose.

At a guess, main board. I agree if power supply board is bad, you won't get DVD working.

This remote control have no set-up codes to this brand TV. If you wish to get more details, check this link. http://electrohelponline.blogspot.com/ Pull up previous posts there, either by its left side bar, or view it in Timeslide option.

Check this code.
10056

Sorry, Myron & Davis are no longer made...I was a dealer and the service end has gone bye-bye.

go **** your self u ugly hoe!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Samsung Home Theater Systems have a Dealer Lock or Tray Lock Function that prevents the disc tray from being opened.
There are four procedures for turning off the Dealer Lock function. Try one, then the other, to see which works on your system.
Unlocking Procedure 1 To turn off the Dealer Lock function, follow these steps:

1. Turn on your Home Theater System.
2. Press the Stop button on the front panel and the Power button on the remote control simultaneously for four seconds.

Note: Repeating the two steps above turns the dealer lock on again.
Unlocking Procedure 2 To turn off the Dealer Lock function, follow these steps

1. Turn on your Home Theater System.
2. Press and hold the Function button on the front panel for 3 seconds. The display shows the word Unlock.

Note: Repeating the two steps above turns the dealer lock on again.
Unlocking Procedure 3 To turn off the Dealer Lock function, follow these steps

1. Turn on your Home Theater System.
2. Press and hold the Open/Close button on the DVD player on the front panel for more than 4 seconds.

Note: Repeating the two steps above turns Dealer Lock on again.
Unlocking Procedure 4 To turn off the Dealer Lock function, follow these steps

1. Using the HTS remote press the Menu button + 712, and the HTS will display CAN OPEN.

The Dealer Lock feature is mainly used by retailers to ensure that the display discs are not removed. However, parents of young children may find this feature very useful as well.

uplug then replug then press eject

How I got my DVD from ”lock” condition

My DVD (Panasonic m: DMR-ES10) had gone to ”locked” condition without any warning.

Perhaps the reason was that I transfered the machine when it was on and recording was going…

Guidebook didn´t help to resolve the problem, neither Internet. Finally I managed to solve the promlem . This is how i did step by step:

1) Power on
2) Hello
3) read
4) no disc
5) functions
6) to others
7) setup
8) select down arrow
9) disc
10) select right arrow
11) setings for playback
12) enter
13) ratings (level8)
14) enter
15) No limit
16) enter
17) ”The Recorder is now unlocked” (picture of open lock)
18) enter
19) return
20) return

After this DVD works normally.

Jalmari

To turn on the dealer lock function: Turn the DVD player on. Press the Stop button on the front panel and the Power button on the remote control simultaneously for four seconds. Note: When the dealer lock function is active, DEALER LOCK ON or DEALER LOCK OFF scrolls on the FLT display. this is from samsung's site