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LG 50LN5700 has horizontal bands 2 or three of what looks like high frequency noise that pop on and off the screen at regular intervals.

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  • LG Master
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Change power outlet see if goes away and check connections possible feed back from source if all ok possible bad video board

Posted on Jan 24, 2020

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5 Suggested Answers

Anonymous

SOURCE: Danby Air Conditioner

I have the same problem with my Danby AC unit...every 5-20 seconds it makes a god awful clicking noise...Make me wanna cry

Posted on Jul 30, 2008

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Anonymous

  • 1 Answer

SOURCE: shimmer and bands

i experienced a tainted vertical black lines on the boths sides of my lcd screen. There was no scratch or whatsoever that could be the reason why thsi balck colored vertical lines to spread. Hope you can help me solve this problem. Thank you..


Posted on Oct 28, 2008

taran_2005

taran_2005

  • 10515 Answers

SOURCE: broken horizontal stripes except for 6" band

there are two convergnece boards in this tv. one is called the convergence (DCU) the other is called the convergence amp board. this amp board has the (STK`S) on it and ids your problem. in most cases we repair this board.



good luck :)
let me know if you need more info?

Posted on Jan 11, 2009

Anonymous

  • 1139 Answers

SOURCE: ps 27123 have sound, tuning etc only small horizontal color band

Hello bdedrick708,

If what you are trying to say is that you have a 1/4 inch horizontal line across your screen, this means that something in your vertical deflection circuit has failed. This could be the vertical oscillator, the vertical output processor, the vertical coupling capacitor, or the vertical section of the yoke transformer.

If what you are talking about is a vertical line from top to bottom then you are possibly talking about a failed horizontal section of the yoke transformer.

Why so little about the horizontal section of the yoke? That is because if the horizontal section fails completely then you would lose high voltage and no line would be present because you would not have raster (screen light).

In any even check the yoke transformer first. Then work back from there.

I hope this helps,

Thank you,

Shuttle83

llc
.com/">http://www.electron-age-technologies-llc.com

Posted on Feb 08, 2009

Anonymous

  • 102 Answers

SOURCE: a three loud consecutive popping sounds at various

You probably have a bad compressor. It's internal parts are held up with 4 springs and one of them has probably broken and causes the compressor piston to hit the side of the comp. housing. This will happen when the ref. shuts off. To be sure, if you turn the ref off at the controls then you should hear the noise in the back. If it is less than 5 years old you can get it replaced under warranty. if more than 5 years old it will just be noisy. it will most likely last several more years like it is. Let me know if I'm right.

Posted on Apr 01, 2009

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So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...


To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

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sounds like you are seeing what are called retrace lines

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Hi Ethan,

What you're looking for is called a "crossover". A crossover is an electronic filter for an audio or speaker circuit. In an audio circuit, a crossover is used to prevent or pass certain frequencies or a range of frequencies from passing through it. Since your sub will reproduce the bass or low frequencies, you don't want other speakers to reproduce them. A band pass filter on your door speakers will do this for you. A band pass filter passes only a range or "band" of frequencies and blocks those that are above and below the range or band of frequencies selected. Installing a band pass filter will prevent the very high & very low frequencies from getting to the door /dash speakers. Likewise, you should consider connecting a low pass filter to your subs, too. The low pass filters work a little differently from of the way band pass filters work - they only allow low frequencies to get to the sub - blocking all the other higher frequencies (your other speakers are better suited to reproduce those). Lastly, you would install a high pass filters on tweeters. Tweeters are designed to reproduce only the high frequencies - sending mid and low frequencies to them is wasting power and can cause damage to them.

You purchase the filters for specific crossover points (the block / unblocked point) as determined by the individual speakers. If a sub has a frequency response of 20Hz - 100Hz, a low pass filter of 100Hz would be ideal. Remaining filters would need to begin at 100Hz - assuming the mid-range speakers have a frequency response beginning at 100Hz. A band pass filter of 100Hz - 3KHz would fit the bill nicely if the mid-range speakers go up to 3Khz Match the high end of the band pass to the high end of the frequency response of the mid-range speakers. Next, a high pass filter at 3KHz would allow only the high frequencies to your tweeters. Basically, you want to have the entire audible range 20Hz - 20KHz covered by the speakers and have the crossover points that match the frequency response ranges of the speakers.

I hope this helps & good luck!

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1 Answer

Horizontal flashing color stripes.1/2 second intervals on pic


If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

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1 Answer

Shimmer and bands


i experienced a tainted vertical black lines on the boths sides of my lcd screen. There was no scratch or whatsoever that could be the reason why thsi balck colored vertical lines to spread. Hope you can help me solve this problem. Thank you..


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The monitor may not be able to handle the settings of the video adapter. If you boot into safe mode (tap F8 key as the computer starts), does the display appear correctly? If so, then you just need to turn down the settings (resolution, color quality, frequency) to the lowest possible settings. If the display still appears wrong, then it may be something wrong with the monitor. You can try connecting the monitor to another CPU and see if you can replicate the results.

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