I have a problem with my Samsung UE55MU9000T TV, which is out of order. The TV starts up normally, but after about a minute, horizontal lines begin to appear on the screen, and after another minute, only horizontal lines remain.
I noticed that the DC/DC converter on the motherboard (BN41-02570B) gets slightly warm, and when it reaches approximately 43 degrees Celsius, the horizontal lines appear. If I cool the converter with a freeze spray, the lines disappear, but of course, they reappear after a few seconds. I disconnected the LVDS cables and observed that the temperature of the...