The explanations below are only for the LTF400HM03 coded panel. It does not work for different panels.
PROBLEM ------ > After a while, the picture flickers and starts showing double frames:
In order to determine which side of the panel the problem originated from, first remove the left film that connects the t-con card to the panel from both the t-con and the panel and run the TV. If the image displayed on the screen is correct, the right side of the panel is defective. If the image is the same, attach the left film to both the t-con card and the panel, and this time remove the right film. If the image improves, the problem is with the left side of the panel.
Remove the RM1, RM2, RM3, RM4, RM5, RM6 and RM7 resistors on the panel board to fix the problem on the right. If the image did not improve in this state, replace the resistors you removed one by one and check the image again each time. If a problem occurs when you wire a series of resistors, leave that series idle. Remember to replace all resistors except the series causing the problem.
You need to use the same method to fix the problem on the left.
Although the flickering problem has been eliminated, if there are horizontal lines on the screen, you should make the changes in the picture.