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Channel 3 is normal for that. Always have it on channel 3 on the TV set. Then you can work with it. Check your stuff and see is there a switch to set for channel 3 or 4, if none present, put it on 3, then start from the menu to set it up with remote.
Okay Welkins, try to power of the tv and power it on by keep on pressing POWER-BUTTON and MENU-BUTTON at the same time,... and see if the tv start into de menu mode....if it does...just keep on using volume "up and "down" button combined with channel "up" and "down" buttons to select an reach the UNLOCK-MODE...most of the time the MENU button will be the enter button after each sellection....hoping to inform you correctly I remain,Yours Friendly.
It sounds as though the battery backup for the memory has failed, some sets use a cell battery like the ones in a pc or some watchs, some have a plastic cover with a cble which connects to the circuit board. Have a look around inside if you are competant, but be careful, make sure the set is switched off and if you dont know what something is then dont touch it. Even when switched off, some tv's can store enough voltage to kill you.
Make sure in the menu that you are using cable instead of antenna - then do a channel scan if you are using a coax and not thru a cable box. Have you tried any other inputs to ensure they are working properly? Please reply if you need additional assistance.
A firmware update from TCL will fix the problem. Call them and they will send out the firmware and a serial cable (required for update) for free. I did the update yesterday and it fixed the problem (sound but no picture). You will need a PC or laptop with a serial port (RS-232).
Simultaneously press “DISPLAY” button on remote handset and Volume- button on the front panel of television receiver for 6 to 8 seconds to get the various service menus.·To access any parameter , use Up/Dn keys of Program/Channel ·To change value of any Parameter, use +/- keys of Volume ·To exit POWER switch off the set