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Tim Miller Posted on Mar 16, 2021
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I have a LG 50ln5700-uhbusyljr I just replaced the led’s & led board .. it had a black screen.. now when I turned it on everything works but the bottom 1/2 of the screen goes from clear to blurry ,back to clear & back to blurry over and over.. I rechecked all connections & tried all adjustments... any ideas ? T-con board? Or is the screen bad ?

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  • LG Master 76,851 Answers
  • Posted on Mar 19, 2021
The Knight
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If you wish to get some details; check the site linked here. Pull up older posts.
https://elektrotricks.blogspot.com/
https://electronicshelponline.blogspot.com/
faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Search the site by type in the brand name of your set, in its search bar at the right side column, and press enter.

Screen-shots to defective LCD panels too are given. You can see and compare to that to your TVs', and can make sure about the fault to an extent.

5 Related Answers

Anonymous

  • 337 Answers
  • Posted on Oct 27, 2006

SOURCE: Screen goes from blurry to clear to blurry

The first thing to check is for loose conections,the problem is related to the high voltage but it can start in the main board with one component loose,when the high voltage is developed it goes to what is call the distributor block,a lot of sets have the focus and screen controls coming out of this block for each picture tube,this block might be bad but before we go to him we need to check everything is solid in the main board.If you are familiar with electronics you can remove the back cover and tap the chassis with a wooden or rubber handle to see if the set reacts,if it does you need to be atentive what area makes it react and flip the board to do some resoldering,If you are not too familiar with tv service you need the assistance from a servicer.Let Us know how it goes or if you need more information.

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Anonymous

  • 6 Answers
  • Posted on Sep 18, 2008

SOURCE: Replaced Bottom screen bypassed fuses still problems

If you need the fuses - try here

http://cgi.ebay.co.uk/Nintendo-NDS-Fuses_W0QQitemZ150295403292QQcmdZViewItem?hash=item150295403292&_trkparms=72%3A12%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14

Anonymous

  • 748 Answers
  • Posted on Mar 28, 2009

SOURCE: black screen on led

Monitor is going bad. Have it checked by a reputable repairperson.

B52Tony

Tony Nguyen

  • 96 Answers
  • Posted on May 20, 2009

SOURCE: Screen goes blank at first try. Works after 1-2 tries.

this may be your inverter going bad. Inverter is the board(s) on the side of your TV that powers up your screen.

Chi Chu

  • 8457 Answers
  • Posted on Sep 04, 2011

SOURCE: #1 tv has black

The tv board that called a T-CON board it is dying to causes these problems.All the tv pictures dots pixel codes go through this board before it show up onto the tv LCD sreen panel.This tv T-CON decodering board sit in the midle at the bottom of the tv LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish T-CON board for the replacement.

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Lg model 50ln5700-uh black screen

When you tunr on the switch ,can you see the power light ?If no power light ,I think your tv power board is dead.
you can have a look this website:www.abctay.com,they sell tv power board
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What voltages and at what points should I be testing to narrow down the problem, or what other problem-solving technique should I be testing?

First question, what do you mean by replaced the LCD's...LCD's would be the panel itself and I know you didn't replace that as you can't get one for under several hundred dollars, more than the cost of the set new in most cases. In your 1st sentence you said I have a LG 50 LCD TV Model: 50LN5700-UH...your tv is a LED set.
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I have an LG 50" Smart LED TV (model # 50LN5700-UH). I have a black screen with sound. The picture flashes up momentarily when it powers on. The back lights flash on momentarily when it powers on. You can...

You are on the right track -led's are pretty durable items and I would try the inverter board first since it supplies the juice for the panels to work and is a source of issues.
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Hi Randy,
Since you have replaced all boards and the TV still does not work, The LED's strips have failed and will need to be replaced.
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http://electronicshelponline.blogspot.com/
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Model 50LN5700-UHBUSYLJR. Why is there sound but no picture??

Chance your led strip if you are sure that your power supply led module is working perfectly
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