Grundig ST 70-270/8 IDTV CUC 1825 green raster on screen????

[pandora's box]

I have a problem with a Grundig CUC 1825 chassis. The TV works but there is a raster over the whole screen of little green lines. The raster is there with a signal from the antenne input and also by a video signal using the scart input. There is no raster by using teletekst or by the bleu screen when there is no signal. I think it's the feature box, i've opend it already and looking for bad capacitors? Can anywone help me?

 

[TV-Troubleshooter]

UG2?

Check the correkt UG2 Voltage.
Otherwise you have to change the Kathode Signals (RGB) from the Tube.
Maybe your Tube is defektive.

 

[pandora's box]

UG2?

Check the correkt UG2 Voltage.
Otherwise you have to change the Kathode Signals (RGB) from the Tube.
Maybe your Tube is defektive.

How can the tube be defective or the UG2 be bad when there is a normale picture when teletext is used (no raster). How much is the UG2 anyway, i have no service manual

 

[TV-Troubleshooter]

Defectice Tube ist possible.

Clip the measurement wire from your Oszi to the Kathode (Green) of the tube. Now check the DC Level by using Videosignals (TV or Vide and Teletext - RGB-.
Reduce the UG2Voltage an watch the Picture.
Good luck!

 

[pandora's box]

Defectice Tube ist possible.

Clip the measurement wire from your Oszi to the Kathode (Green) of the tube. Now check the DC Level by using Videosignals (TV or Vide and Teletext - RGB-.
Reduce the UG2Voltage an watch the Picture.
Good luck!

I've plugged the feature box in the wrong way (it is possible whithout metal housing) and now it's total loss, so i'm looking for a good feature box: 29504-103.37