X7G shows video for 1 second then goes black, any replacement boards available?

Question edited for clarity, typos, spelling.

In general, all televisions can be repaired if boards are available. but depending on age, a failure like this is often a good chance to upgrade to more modern alternatives for both picture quality and features. Having said that, your Grundig is a full HD set and worthy of repair.

https://www.fixya.com/support/r29790007-repairing_own_television

https://www.google.com/search?q=Grundig+46%22+VLE7239BR

..

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

There is a circuit board that is failing. Sorry but it is time to buy a new monitor. If you are skilled at electronics repair you can replace the circuit board, but I have found that the price of the circuit board plut the effort of replacing it is not worth the trouble.

I'm just curious about what make and model is your computer?

When the backlight does not stay on for more than a second, the problem is usually the backlight power supply board failure. Typical failures are blown capacitors, or transistors. A electronic repair shop should be able to fix it.

leos343872, Black screen type of failure. Is anything still displayed even though screen is black when you hold flashlight 1 inch from lower left corner near start button??? Possible "switch-mode-power-supply" in shutdown mode. Tech or you will need to evaluate further!! Read more of my advice to other owners with BLACK screen monitor problems in my profile. or louie12fix profile. 12fixlouie

This Acer 2416w has problems with weak capacitors on the inverter board causing shorting of the driver FETs. Replacing caps and shorted FETs may solve the malfunction.
Monitor Mike

The backlight video inverter board is dead.Need a new board.

For most of the problems above you will find it is bad capacitors on the power board sending unstable power accross to the controller board.

For the last posted problem (Comment by Guest, posted on Jan 02, 2008) you have a dodgy inverter circuit that needs to be repaired.

Both faults should be fairly cheap to have taken care of at your local TV repair shop. You may need to call a few in your area not just for a quote, but also to see if they are willing to work on an LCD monitor.

Hope that helps you all =)