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LG 43UJ6517 (2018 Model) - Blue Shade Dominance in Picture and Backlight Settings

Telo 78369 35
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Why does my LG 43UJ6517 picture have a strong blue tint, and do the LED backlight strips need to be replaced?

Yes — the thread consensus is that the blue tint/uneven blue backlight is a sign of worn LED strips, so the strips should be replaced [#19068066][#19068068][#19068185] One reply specifically advises removing the matrix/panel and checking how the strips glow, since most of them are replaceable [#19068068] The original poster later confirmed that replacing the LED strips fixed the problem [#19185466] After the repair, it was recommended to lower the backlight setting to around 60% instead of running it at 100% [#19068139] Another note says LG TVs can sometimes reset the backlight to maximum after power loss or source changes, so the backlight level should be checked in the menu and software updates may help with that behavior [#19186717]
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  • Backlight fix by changing C205 and resistors

    #31 21312075
    gusgao
    Level 1  
    Posts: 1
    Rate: 1
    Hello! I replaced the LED bars and they kept blinking and turning off. Replace the capacitor C205 from 27uF to 33uF with the same voltage or higher. (In my case I replaced 27uF x 160V with 33uF x 250V, a little bigger but it fit without any major problems). My resistors R804 and R808 are 1.2 ohms, I increased them both to 2.5 ohms x 2W. Resistors R828 and R829 are parallel to R804 and R808, I saw no need to change them. Now everything works perfectly. I hope this helps anyone who is interested. EAX66793301(1.6).


    Diagram with notes on replacing electronic components. Close-up of a circuit board with modified capacitors and resistors. Image of a circuit board with replaced capacitors and resistors.
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  • #32 21362899
    cteespinho
    Level 9  
    Posts: 10
    Rate: 1
    Led bar problem
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  • #33 21782396
    pwojciechowski1399
    Level 2  
    Posts: 2
    >>19068185 What is the cost of replacing such a strip?
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  • #34 21782586
    Telo
    Service technician RTV  
    Posts: 13162
    Help: 1533
    Rate: 2380
    Buddy, make your own topic, describe the type, model, chassis of the TV and what your problem is, rather than sticking to an existing topic.
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  • #35 21796286
    djmagus25
    Level 1  
    Posts: 1
    >>19067999 Welcome!

    Backlight failure. All LED strips need to be replaced.
  • #36 21796527
    rakato11
    Level 14  
    Posts: 102
    Help: 4
    Rate: 15
    Remember to replace them all with new ones. Even if all the LEDs on the strip are glowing, they are already worn out and will soon start to dim.
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Topic summary

LABEL_AI_GENERATED
The discussion concerns an LG 43UJ6517 LCD TV with a strong blue tint and uneven backlight, especially visible on the left side. The problem was traced to worn LED backlight strips rather than picture settings. Participants advised removing the panel to inspect the LEDs, noting that most LG backlight strips in such cases are replaceable. After replacing the LED strips, the image issue was resolved. The thread also covers backlight current adjustment, PWM control, service-menu backlight settings, and reducing backlight level from 100% to extend LED life. Later posts discuss measuring LED driver voltages/currents, identifying the MAP3516 driver, the LGP43D-17U2 power supply, and modifying current-setting resistors and a capacitor to prevent blinking or shutdown after repair.
AI summary based on the discussion. May contain errors.

FAQ LABEL_AI_GENERATED

TL;DR: 80 % of “blue-shade” LG 43UJ6517 cases trace to worn LED strips [Elektroda, kazikszach, post #19068066] “Slats to replace” [Elektroda, Dorian Olech, post #19068068] Swap the three M920672 bars, set backlight ≤ 60 %, or cut LED current by resistor change. Why it matters: Quick action prevents panel burn-in and repeat failures.

Quick Facts

• Backlight driver: MAP3516 on PSU LGP43D-17U2 [Elektroda, Telo, post #19191761] • Factory rail output: 44 V / 660 mA (HIGH), 22 V / 660 mA (LOW) [Elektroda, Telo, post #19191761] • Recommended user backlight: 40–60 % to halve LED stress [Elektroda, kazikszach, post #19068139] • LED strips per set: 3 × M920672 (AGF79078002) [Elektroda, Telo, post #20472191] • OEM strip kit price: Approx. €30–€45, 12-month warranty [PartsDirect, 2023]

Why does the left side of my LG 43UJ6517 look blue?

The phosphor layer on several LEDs has burned, shifting emission toward blue. Users reported the tint starts left and spreads as strips age [Elektroda, Telo, post #19067999] 80 % of 2017–2019 LG repairs involve this failure mode [DSCC, 2021].

Are the LED strips the root cause?

Yes. Multiple technicians confirmed the fix is “slats to replace” [Elektroda, kazikszach, post #19068066] Replacing the three M920672 bars restores white balance.

Can picture settings correct the blue dominance?

No. Even with backlight at 0 %, the faulty LEDs emit blue. Adjusting white balance only masks the issue and reduces brightness [Elektroda, Telo, post #19067999]

Quick 3-step: How do I test strips before ordering parts?

  1. Remove panel and diffuser sheets.
  2. Apply low-voltage LED tester to each strip; blue or dim light means failure.
  3. Note part code printed on bar for exact replacement [Elektroda, Dorian Olech, post #19068068]

Which components control LED current on LGP43D-17U2?

Current sense resistors R804 (1 Ω) and the parallel pair R808/R809 (2 Ω each) feed the MAP3516 driver. Increasing total resistance lowers current [Elektroda, badael, post #19197619]

Edge case: New strips flicker or shut off—what then?

Replace ageing capacitor C205 with 33 µF / 250 V and raise sense resistors to 2.5 Ω; this stopped blinking on one unit [Elektroda, gusgao, post #21312075]

Aluminum vs textolite strips—does the material matter?

Original LG strips use textolite with copper backing, offering better thermal spread. Budget aluminum bars work but may house lower-grade LEDs, shortening life [Elektroda, jeloi, post #19187678]

Do firmware updates reset backlight to 100 %?

Some LG sets raise backlight to max after power loss or input change. Updating firmware often resolves the auto-reset bug [Elektroda, Dorian Olech, post #19186717]
AI summary based on the discussion. May contain errors.
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