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You have two possibilities; either buy the original remote or look up the code for 'universal' remote for that set here:
If you can't find the code set for the remote & TV you have, look for a code set for one of the following brand names:
Funai, Symphonic, Sylvania, Emerson, Aventura, Durabrand,
ESA, Magnavox, INSIGNIA, Philipsand Misakai
ALSO: I searched a Magnavox manual for the lock feature here is what I found...
The following functions are disabled during SDM (and enabled after leaving SDM):
· Parental lock
· Blue mute
· Hospitality Mode
· No-ident Timer (normally the set is automatically switched off when no video signal (IDENT) is received for
All other controls operate normally.
Entering Service Default Mode
To enter the Service Default Mode, press the following key sequence on the remote control transmitter:
Do not allow the display to time out between entries while keying the sequence.
Upon entry into the Service Default Mode, the letters “SDM” will be displayed at the upper right corner of the screen.
- Line 7 : “CHANNEL BLOCKED”
Indicates that all channels are locked except the selected channel.
The following complaints may be generated due to locked channels:
- TV cannot be switched on from standby with the local keyboard buttons.
- “CH+” and “CH-“ buttons on local keyboard do not function.
To disable the LOCK feature:
Select ”FEATURE” menu (with the Remote Control).
Select “LOCK” (with the Remote Control).
Set to “OFF”
You can get the actual remote control for that model at the following link. If your not sure which one it is just leave them a email with your model number and they will respond quickly. Heres the link. http://servicemanuals.vstore.ca/
sgtdar, list the model & chassis number (located on back of tv), if set is old the universals won`t work because as more newer sets come out they delete the older ones because the chip in the remote will only hold so many codes, BMW Rider
This denotes a problem called blooming the horizontal lines you see are called retrace lines this is caused by the increase in anode voltage which could be caused by an increase in HV section current which trips the overcurrent protection dircuit and turns the TV off.If you do not have electronics experience I would suggest taking the set to a TV repair shop.