A thin white line across the raster Admiral TV 1948 model 17T12

[recepteur]

Good evening gents,

I’m seeking your technical advices on an Admiral TV 1948 model 17T12
Symptoms: A thin white line across the raster half way down the screen regardless if I adjust vertical height and horizontal width, the thin white line remain. See attached pictures.
Known facts:
• Picture tube: 7QP4
• No alignment has been conducted yet.
• Vertical and horizontal sweep and synchronization are good.
• Reception on channel 3 and 4 using a DVD player is good, picture display well and the sound is loud and clear.
Actions taken to date:
• All the capacitors have been replaced with the exact values and voltage rating.
• Few resistors were out of tolerance and were replaced accordingly.
Any inputs and suggestions would be most welcome.
Your help in this matter would be greatly appreciated.
Best regards
Daniel