In this post we present another notorious issue that many encounter on their flat screen LED/LCD TV displays. Below are 2 videos showing how to fix TV displays that are manifesting the annoying horizontal and/or vertical lines problem.
The first video shows how to troubleshoot and fix an LG flat screen TV (model 42LN5400). Note that this may also be applicable to other brands (e.g., Sanyo, Panasonic, Samsung, Vizio, etc.). One key thing to determine here is whether the horizontal or vertical lines are flickering on and off and aren’t permanent. If the lines are permanent, then this may be indicative of a bad LCD panel which is a more complicated problem that can’t be fixed easily (or cheaply). The video does a great job showing examples to help differentiate the possible causes of the lines appearing on the screen.
Video 1: Fixing Horizontal Lines for an LG LED TV Model 42LN5400
The common culprit that first needs to be investigated is the possibility of a faulty T-Con board and the video shows possible symptoms of this problem, where to source it and how to replace it. The symptoms to watch out for include:
- Discolored screen
- TV glowing but showing no pictures
- Only half of the screen is displaying images
- Horizontal and vertical lines
- Screen is all white
True enough, replacing the T-Con board fixed the issue here.
One key thing to note is that there are more than one different kinds of horizontal and vertical lines that can manifest on an LED/LCD TV screen. Case in point, if the lines are horizontal, permanent and solid black then it is highly likely a bad LCD panel itself. Vertical lines are more likely indicative of a bad T-Con board or possible connection issues with the T-Con board.
In the next video below a similar problem of vertical lines showing on the screen but with an added complication of the TV turning off and then on by itself. This seems to be a bit more complicated problem and the video provides the step-by-step instructions on how to troubleshoot and repair the problem. Note that the T-Con board is also included in the troubleshooting process here.
Video 2: Fixing a Samsung TV Displaying Vertical Lines and Cycling Off and On by Itself
Key safety tip: Unplug your TV before performing any steps. Note that if the Standby light is on, then there is standby voltage going into the main logic board. Be safe.
Video Credits for this post: Tampatec and Fix Netflix
Related: Vizio and LG LCD TV Repair: LED backlight repair or replacement
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