This can sometimes be something as simple as a loose wire, but it can also mean that some of the pixels in the TV have failed. If the problem has to do with loose connections, a pro can tackle it.
They can be caused by an inadequate input signal or by loose wires and connections. If the lines are moving up and down the screen, this is a sign that the input signal is the problem.
Here, the cause of this issue is usually that the wire to the speakers may be loose. Internal audio wires could be loose or damaged too. There is also the chance that the internal speakers were damaged.
When this happens, it usually means that the fuse has burned out. If your TV won’t power up but you notice blinking lights, this can mean that it detected a problem through the self-diagnostic system.
Spider lines, or lines that spread out from a point on the screen, are another issue. This usually happens after the internal glass breaks. It’s likely the LCD panel has to be replaced by a pro.
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Try unplugging your TV and plugging it back in before servicing it.
Ask whether replacement parts are an option before replacing a tv.