Good morning companions I ask for your help in order to solve a problem I have with this Samsung TV CT-7277BP with chassis k-1025, which had perfect audio but no video, checking the tube plate different voltages 130v, 9v, 200v, 16v and Heater are present except voltage in RGB, verifying I found two R of 1K and two crossed transistors BF423 and C4544 respectively in the area of GK , identified as R720, R742, Q707 and Q708 , replace these components and after checking anything else damaged I turned on the TV and still without picture. If I place the three diodes to circumvent the IK, an image appears but with weak colors, practically black and white, but the funny thing is that if I disconnect the union of the three cathodes of the IK line there if the perfect image appears for a few seconds then it goes, and only comes back if I connect the diode cathodes to the IK pin again but the same in B / N and when it takes off it comes out in perfect color and leaves and so on, if under the Screen it stays but the colors run, if it I get better but the image goes down, what could be happening here? I do not find a support diagram of this video card, I am guided by a Sony one that is quite similar in its circuits and components. Can any of you help me to find the real problem? I upload photos of the plate on both sides ... [img] https://adjuntos.yoreparo.com/imagen_post/0004/82/9979114d4/djd9d7dg/djpdpdpdppppdpppdpppppp img]

hello friend Jose Ortiz, there what is happening is that the screen gave what it had to give, do not wear out looking for problems elsewhere because the fault is on the screen, if you want to do a good job change the screen or try to rejuvenate it with an artifice that you will find on the Internet for this purpose. when you adjusted the screen you had to turn a little "minimum" not much because it will not work well because you have cathode problems. Greetings from Valledupar Colombia.

Enter the service menu and deactivate the AKB item.