Grundig 37 lcd picture not coming on from standyby

Check and replace the main power supply regulator board.

There is probably a fault in the video processor, or there is a setting for the user colour temperature that is not properly set. Call the authorized service for advice on how to proceed

http://www.grundig.de/en/manuals.html

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

I just want to clear things here.
The stand by light will remain on whenever the tv set is turned on by a button on the side of the tv.

Then use your remote to turn on the tv, but wait as it can take 10secs before you get a picture.

If the screen goes completely black but still have sound then the backlight inverter board may be going out.

The lamp is going bad.

It might be an old hotel tv. Try this, it worked for me

http://www.tvtuning.co.uk/makes/grundig.htm

basically you hold the i button whilst turning on the tv.

ta

http://www.nodevice.com/manual/Grundig/page2.html

here is link download

If you are getting the initial 'pang'(!!!???) noise, then it looks like a cold solder in the Horizonbtal Oscillator or Hor. Output stages. The set is trying to power up, but the Horizontal Oscilator is not 'booting' up. Since it is a new set, it must be under warranty....Get it checked by the company Technician.