Menu keeps flashing on screen

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

Make a hard reset to this set first and check. If it do not help you, replace in main system memory IC. Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1000 posts to different brand TVs now. Pull up older posts there.

Please go through operation manuals and follow step by step.

Please follow guidelines in operation manual, step by step.

Hmm
Looks like the back light or the driver circuit has failed.
If you shine a bright torch at the screen can you see a very faint image ?
If so then its the back light has gone.
If you cant see anything its the screen driver.

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thanks

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Take out the battery an hour,put in back in,have the same problems.The remote is dead.Try website like Remotes.com to buy an exact remote.Yes,u can use the manual control buttons on right side of the tv,but a little hard.

did you find the code ?

Unplugging the television for about fifteen minutes or so, then plugging it in again.

Remove the three screws from the back of the stand.
Remove the four screws from the bottom of the stand.
Looking down at the bottom of the stand, push the four protuding clips inwards (not easy - you may need to gently ease them with a small screwdriver)
This unclips the oval base and allows you to unscrew the remaining screw inside the stem of the base

Please i have this Grundig lcd tv,model number GU22DVD,how to enter service mode to change sound standard PAL I toPAL BG,help me.