Samsung might have one but I don't know whether they do or notĪnother thought that just occurred is that there must be a return path for the signals being fed down from the Tab connectors to the screen. Other than that I know of no publicly available test program etc that would help. Try cleaning and reseating the contact ends of the 2 flex cables, (both ends) that go from the tcon to the TABs on the side where the dimming is, just in case they have come loose during transit you can't spot anything and since you have swapped the cables I guess that perhaps to eliminate that it may be a tcon problem, is that you see if you can source a replacement board from a supplier with a no questions asked returns policy or at least one with a low re-stocking fee. The TAB connector boards can be seen in the image that you posted where the 4 flex cables from the tcon board connect to them. These connections are very fragile but usually when they disconnect from the panel there are vertical black lines not just a darkening and also not over such a wide area. There are tab connectors along the top of the TV that connect the tcon board to the LCD panel. If they do then at least they have been eliminated. If not then there is a problem with the backlight array power feed somewhere, power board, cable or LED array. The LED backlights should come on and stay on and they should all have the same intensity. Reconnect the power to the TV and turn on the TV. Turn off the TV (if on) and then disconnect the power from the TV.ĭisconnect the cable between the power board and the mainboard. Try testing that all the LED backlights are coming on the same if only to eliminate them as a problem.
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