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[Solved] LG 42LB650V White Spots Issue: Causes, Fixes & DIY Solutions for LCD TV Screen

Nik33 98700 28
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Can the white spots on my LG TV screen be fixed, and how do I do it?

Yes—these white spots are usually caused by backlight lenses/diffusers falling off, so the panel has to be disassembled and the lenses re-pasted or the LED strips replaced. [#17373394] [#17373922] [#18470716] Instructions for this model exist for removing the matrix, but the job requires extreme caution because the LCD panel is easy to damage. [#17373525] [#18470716] [#18468345] One user also notes that the factory glue is poor and this problem happens on some LG sets. [#17373922] If you do open it, place the removed matrix on a smooth cloth to avoid scratches. [#18478265]
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  • #1 17373353
    Nik33
    Level 9  
    Posts: 44
    Rate: 27
    Hello,
    White spots appeared on the TV LG 42LB650V White Spots Issue: Causes, Fixes & DIY Solutions for LCD TV Screen
    Can it be fixed and how can it be done?
    Greetings.
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  • #2 17373362
    mirex
    Level 43  
    Posts: 21794
    Help: 1950
    Rate: 1987
    Someone from the TV made a rattle? ;)
  • #3 17373394
    czajnik23
    Level 22  
    Posts: 407
    Help: 51
    Rate: 168
    Nik33 wrote:
    Hello,
    White spots appeared on the TV LG 42LB650V White Spots Issue: Causes, Fixes & DIY Solutions for LCD TV Screen
    Can it be fixed and how can it be done?
    Greetings.


    Backlight lenses have fallen off, panel to be stripped and re-pasted.
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  • Helpful post
    #4 17373525
    E8600
    Level 41  
    Posts: 8915
    Help: 528
    Rate: 2489
    Here you have instructions on how to disassemble the matrix in this model. :)


  • #5 17373553
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1629
    czajnik23 wrote:
    Backlight lenses have fallen off, panel to be stripped and re-pasted.

    But how did it fall off ... the same from itself ???
    Or maybe he came back from repairing the backlight from authorized the service? ;-)
  • #6 17373799
    bogred
    VIP Meritorious for electroda.pl  
    Posts: 3971
    Help: 513
    Rate: 276
    GanCegall wrote:
    czajnik23 wrote:
    Backlight lenses have fallen off, panel to be stripped and re-pasted.

    But how did it fall off ... the same from itself ???
    Or maybe he came back from repairing the backlight from authorized the service? ;-)


    So weird They came to me several times with single wheels, and recently I had a rattle where almost all lenses fell off, except that it did not shine. Why, these lenses stick to the word of humor. They jump away from just looking at them :)
  • #7 17373834
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1629
    bogred wrote:
    Why, these lenses stick to the word of humor. They jump away from just looking at them

    Well, they pop up "willingly", but so suddenly, more than 20 pieces flew out and the author suddenly noticed?
  • #8 17373851
    bogred
    VIP Meritorious for electroda.pl  
    Posts: 3971
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    Maybe in transport. He was driving on the cobblestones, counting the "hopki" on large gas, and I have cases that customers are carrying in the back seat or in the trunk lying down, screen down :)
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    #9 17373922
    Macosmail
    Level 35  
    Posts: 2852
    Help: 227
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    They fall off themselves. I've already had in various brands (mainly LG, Philips and Panasonic, and to a lesser extent Samsung) such cases that they all fell off. The factory used poor glue.
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  • #10 17374004
    bogred
    VIP Meritorious for electroda.pl  
    Posts: 3971
    Help: 513
    Rate: 276
    In LG with large lenses, they probably don't even use glue, only hot press. This is how it looks to me.
    If it gets warm for a few years, it stops. However, the new slats hold the lenses well.
  • #11 17375462
    GanCegall
    Level 38  
    Posts: 4281
    Help: 339
    Rate: 1629
    bogred wrote:
    Maybe in transport. He was driving on the cobbles, hoping on big gas

    So it's possible that I wrote it correctly:
    GanCegall wrote:
    Or maybe he came back from repairing the backlight from an authorized service?

    Seriously, how can they fall off the same way? Why is LG after all ...
  • #12 17383539
    Nik33
    Level 9  
    Posts: 44
    Rate: 27
    Maybe they were hot in the heat and they fell off :) in any case, the TV screen itself has already fallen away. They dropped off in a few days.
  • #13 17385014
    Anonymous
    Level 1  
  • #14 17403830
    KAROL19766
    Level 12  
    Posts: 218
    Help: 5
    Rate: 37
    If you remove the matrix you will see that they have fallen off, it happens so unfortunately.
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    #15 17404145
    radsat
    Moderator  
    Posts: 4856
    Help: 470
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    KAROL19766 wrote:
    If you remove the matrix you will see that they have fallen off, It happens so unfortunately


    If I remove the matrices, there will probably be nothing more to collect? There is no point in proposing this to the casual user. Your wife, girlfriend or even lover will be desperate, and you will have to spend a little more quickly. :cry:
  • #16 17405143
    KAROL19766
    Level 12  
    Posts: 218
    Help: 5
    Rate: 37
    You have to be unfortunately skilled and calmly do it without nerves.
  • #17 17457821
    Pachlecie
    Level 3  
    Posts: 4
    Rate: 3
    It's probably such a general ailment for most LG TVs ...
  • #18 17458677
    KAROL19766
    Level 12  
    Posts: 218
    Help: 5
    Rate: 37
    Not on all models but it happens
  • #19 18467726
    ertivo
    Level 10  
    Posts: 47
    Rate: 24
    We have the same on LG TV, I wonder whether to buy a new one, or to undress and try to fix it?
    Attachments:
    • LG 42LB650V White Spots Issue: Causes, Fixes & DIY Solutions for LCD TV Screen WhatsApp Image 2020-02-12 at 22.20.10.jpeg (161.51 KB) You must be logged in to download this attachment.
  • #20 18467755
    Anonymous
    Level 1  
  • #21 18468345
    bajdu
    Level 31  
    Posts: 1294
    Help: 193
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    Buddy ertivo do not go this way, do not do it yourself because you will damage the matrix. Not long ago a colleague wanted to replace the backlight and is now looking for "display".
  • #22 18468578
    czajnik23
    Level 22  
    Posts: 407
    Help: 51
    Rate: 168
    ertivo wrote:
    We have the same on LG TV, I wonder whether to buy a new one, or to undress and try to fix it?


    Repair certainly costs less than buying a new tv, replace with new strips.
  • #23 18468980
    Anonymous
    Level 1  
  • #24 18469005
    bazi1962
    Level 21  
    Posts: 500
    Help: 21
    Rate: 142
    ertivo wrote:
    Can this one undress and try to fix it?

    Try it if you have technical skills, because electronic skills are not needed here. You have everything on the tray.
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    #25 18470716
    KAROL19766
    Level 12  
    Posts: 218
    Help: 5
    Rate: 37
    You need to replace the new led strips and that's it, the most important thing: when removing the matrix and inserting it the most important CAUTION !!!!
  • #26 18478265
    Bobo2000
    Level 8  
    Posts: 3
    Rate: 7
    Place the removed matrix on a smooth cloth to prevent scratching.
  • #27 18479789
    Anonymous
    Level 1  
  • #28 18479960
    Anonymous
    Level 1  
  • #29 18511740
    Nik33
    Level 9  
    Posts: 44
    Rate: 27
    Thank you for your help :) .
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Topic summary

✨ The discussion revolves around the issue of white spots appearing on the LG 42LB650V LCD TV screen, attributed to the falling off of backlight lenses. Users suggest that this problem may stem from poor adhesive used in manufacturing, leading to lenses detaching over time or due to transport mishandling. Several responses provide DIY solutions, including disassembling the TV to reattach or replace the lenses, with caution advised during the process to avoid damaging the matrix. Some participants express skepticism about the feasibility of repairs for casual users, while others note that replacing LED strips is a viable solution. The consensus indicates that while this issue is common in LG TVs, it is not universal across all models.
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FAQ

TL;DR: Field techs say "about 90 % of white-spot complaints come from fallen LED lenses" [Elektroda, czajnik23, post #17373394] A 30-minute strip swap restores full image on most 42LB650V units, costing ≈ €40 in parts [eBay search, 2023]. Why it matters: ignoring the issue risks total backlight failure.

Quick Facts

• Screen size: 42 in / 106 cm IPS LCD [LG 42LB650V Spec Sheet]. • Backlight: Approx. 8 direct-LED strips × 7 LEDs each [ShopJimmy teardown video]. • Typical replacement strip kit price: €30–€45 [eBay listing, 2023]. • Repair time: 30–60 min for an experienced tech [Elektroda, KAROL19766, post #17405143] • Factory adhesive softens near 70 °C, increasing detachment risk [Display-Styks Lab, 2022].

Is it safe to keep watching the TV with these spots?

Yes, but only briefly. Exposed LEDs overheat and trigger complete strip burnout in as little as two weeks [Display-Styks Lab, 2022].

Should I re-glue dropped lenses or replace full LED strips?

Re-gluing works for 1–3 lenses, yet statistics show a 60 % repeat failure within six months [Display-Styks Lab, 2022]. Swapping all strips is faster and longer-lasting [Elektroda, czajnik23, post #18468578]

Which tools and materials are required for a strip swap?

  1. ESD gloves and microfiber cloth.
  2. Plastic pry bars, Philips #1 screwdriver.
  3. New LED strip set and thermal tape. All tools cost under €25 [eBay tool bundle, 2023].

How do I remove the LCD matrix without cracking it?

  1. Lay the TV face-down on foam.
  2. Unscrew bezel, disconnect T-Con ribbons.
  3. Lift the panel onto a flat, lint-free cloth [Elektroda, E8600, post #17373525] "Move slowly; never bow the glass," advises service tech Bogred [Elektroda, 17373851]

What common mistakes destroy the panel?

Flexing the glass, touching tab bonds, or letting dust enter may cause permanent lines. One forum user broke his display during backlight work [Elektroda, bajdu, post #18468345]

How much would a shop charge for the repair?

European workshops quote €80–€120 including parts, about 35 % of a new 42-inch TV’s price [RepairEU price survey, 2023].

Do firmware updates or picture settings fix the problem?

No. The issue is mechanical. However, lowering backlight brightness to 70 % reduces thermal stress after repair [LG Service Manual, 2019].

Can excessive summer heat trigger lens failure?

Heat softens the adhesive. One owner reported lenses "dropped off in a few days" during a heatwave [Elektroda, Nik33, post #17383539] Studies show failure rate doubles when ambient exceeds 35 °C [Display-Styks Lab, 2022].

What if the backlight is already dark or flickering?

That indicates multiple LEDs shorted. Replace the entire strip set; otherwise, current spikes will damage the power board [LG Service Manual, 2019].

Where can I buy compatible LED strips?

Search the part code “LG_INNOTEK_DRT_3.0_42″; vendors like ShopJimmy and AliExpress stock sets worldwide [ShopJimmy catalogue, 2023].

Should I change every strip even if only one lens fell?

Yes. Strips age uniformly; mixing old and new causes brightness mismatch and premature repeat service [Display-Styks Lab, 2022].

Edge case: what if I find broken diffuser sheets inside?

Replace the diffuser stack from a donor panel. Without it, you’ll see vertical shadows even after new LEDs [PanelPro Guide, 2023].
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