Hi, I have a Sansumg chassis TV K15D which has rainbow colors on the screen. I graduate the scrin and nothing or delay lines appear. if you disconnect the vertical in the closed line you see the image and colors. replace the vertical la7840 with la783d but I don't know if it works. thank you for help thanks.

hello buddy: you have to put a vertical lc like the q, it takes-LA7840 -... don't put anything else ... those rainbows that are seen on the screen can be a reflection of the horizontal deflection but off the screen or in the neck of the tube which we do not see ... can damage the tube ... place the q, have q., carry and measure tensions on the pins of the verical lc ... pin6y3 = 16v positive ... pin1 = 16v negative ... check or change C307 of 100mfx50v taking care of the position and polarity ... check or measure D304 if it is in good condition ... ok ... greetings!