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55 LED Smart TV Dims Intermittently When Lights Turned On: Wi-Fi, NC+ Decoder Issue?

paradox2604 15558 18
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Why does my TV picture briefly dim or disappear when I switch on bathroom or terrace lights, and how can I fix it?

The problem was caused by the HDMI connection, not by Wi‑Fi or the NC+ decoder; replacing the HDMI cable stopped the brief picture dimming when the lights were switched on [#16934835] [#16938044] The old cable looked fine visually, but it was still the faulty part [#16938044] Similar cases can be caused by interference or a ground loop over HDMI when devices are on different potentials [#16935832] [#16936195] A practical way to isolate it is to try another HDMI cable and another HDMI input, which the thread author did before confirming the fix [#16935755] [#16938044]
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  • #1 16924905
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    Hello, I have a 55 "led TV with wi-fi connected to the nc + decoder and such a problem that started recently. It did not occur before. O :) Namely, when I turn on the light in the bathroom or on the terrace, the TV dims for a moment (the picture disappears and appears). It happens once in a while, sometimes it fades and sometimes it's ok and I don't know what's going on. It was okay before, I wonder if it's not the fault of the smart function or maybe the decoder? I don't know, so maybe you have any ideas?
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  • #2 16925039
    Anonymous
    Anonymous  
  • #3 16925668
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35142
    Help: 3787
    Rate: 5328
    paradox2604 wrote:
    namely, when I turn on the light in the bathroom or on the terrace, the TV dims for a moment

    And what is the light source there - what kind of light bulb: LED, fluorescent ...?
  • #4 16927237
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    Everywhere in the house there are LEDs, rooms, bathrooms, terraces, etc.

    Added after 2 [minutes]:

    Somewhere I read that it could be a coil or something like that on a TV or decoder and it is already dead, but I ask you specialists.
  • #5 16927305
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35142
    Help: 3787
    Rate: 5328
    paradox2604 wrote:
    Everywhere in the house are LED rooms, bathrooms, terraces

    Then dial it one by one and check when the TV is okay.
  • #6 16929031
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    But what's the light for sockets? After all, this does not happen every time, only occasionally, I also have a second TV without the smart option in another room, but everything is ok there.
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  • #7 16929068
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35142
    Help: 3787
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    paradox2604 wrote:
    but what's the light for sockets?

    And this light (bulbs) is not your electricity supply?
    paradox2604 wrote:
    it does not happen every time, only occasionally I also have a second TV without the smart option in another room but everything is ok there

    What are the bulbs, what manufacturer, original or counterfeit, where and from whom are they bought?

    You have no idea how many LED bulbs can make a fuss.
    You do not want to check - the glass ball is on vacation, so there is only an electrician left and you invite him to your home to check the electrical installation.
    Electric sockets may also be to blame.
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  • #8 16929211
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    An electrician checked everything on delivery, so it was ok, but I'll do as you say. I will check the bulbs because it happens occasionally, only when I turn on the light in the bathroom or on the terrace. Standard bulbs, probably Chinese, bought from Leroy.
  • #9 16929345
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35142
    Help: 3787
    Rate: 5328
    paradox2604 wrote:
    an electrician checked everything on delivery, so it was ok

    How many years ago was it, did you already have these LED bulbs?
  • #10 16931853
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    a year ago, when I checked I already lived, everything was like now except the TV

    Added after 14 [hours] 6 [minutes]:

    Ok, I did a quick experience, I turned off the set-top box and turned on the TV itself and now there is a situation when I turn on the light on the terrace, sometimes the image on the TV dims but does not turn off as it happens with the set-top box turned on
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    #11 16932876
    robsonsw
    Level 14  
    Posts: 177
    Help: 2
    Rate: 35
    It is similar with me, only in the end the TV set landed in the service ... I plan to buy a good extension cord with a filter and overvoltage protection, replace the connectors in the lighting circuits (maybe the contacts are burnt out and there are surges). RTV service suggestion replace TV cables with me HDMI ... I'm waiting for what you find in yourself.
  • #12 16934399
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    I will also check the hdmi tomorrow, I will let you know
  • Helpful post
    #13 16934835
    robsonsw
    Level 14  
    Posts: 177
    Help: 2
    Rate: 35
    Well, the matter cleared up, a very simple matter. This is what this forum is for to solve such problems and not to write that the guilty party is "Miecio handyman". The HDMI cable was damaged.
  • #14 16935755
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    Already, I am slowly getting clearer, today I tried on another HDMI input (for me it is HDMI 2) to which I have a console connected and nothing is happening here, i.e. the fault is either in the HDMI cable from the TV or the HDMI1 input or the decoder will buy a second HDMI cable and connect it from the decoder to the tv then we will see
    as for the "city", I already read a lot of topics on this web page and in fact always check the electrician first :) apparently there is such a mentality that all that is bad is the fault of the guest who did the installations
  • #15 16935832
    sylweksylwina
    Moderator of Computers service  
    Posts: 13173
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    This is the fault of the interference. More than once I have seen similar phenomena, e.g. loss of image on the monitor, e.g. when connecting a laptop power supply. Switch-mode power supplies have large capacities and such a phenomenon may occur when they are turned on.
    Of course, the better the HDMI cable and the better shielded, the chance for something like this becomes smaller and smaller.
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  • #16 16936106
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35142
    Help: 3787
    Rate: 5328
    robsonsw wrote:
    The HDMI cable was damaged.

    If damaged, how could it cause interference ...
    Either it works or it doesn't work - everything is zero-one here.
    paradox2604 wrote:
    as for the "city" I have read a lot of topics on this website and in fact, always check the electrician first, apparently there is such a mentality that everything that is bad is the fault of the guest who did the installations

    Only my colleague forgot to notice that in many cases this "Mieciu" becomes indispensable anyway - and hopefully in the case of my colleague it would end up with replacing the HDMI cable (although I doubt it, because the HDMI controller in the TV is the same for all ports).
    Please also remember - we help REMOTE and we only suggest what someone describes to us, so each variant is possible and it is mentioned in order to exclude it (confirm) - no one is a fairy here and will not give you a ready answer, nobody knows and sees what and who was doing.
    With this HDMI it CAN! there may be the right track, but it does not have to be - which is also confirmed by many topics.
    You believe what you want to believe.
  • #17 16936195
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6380
    If the device and their chassis are on different potentials connected only to HDMI, miracles can happen through ground loops in the receiver itself.
  • #18 16938044
    paradox2604
    User under supervision  
    Posts: 35
    Rate: 9
    Thanks a lot for the hints, today everything will be explained, I have a second cable and I am already dismantling the TV :)
    Added after 1 [hours] 26 [minutes]:
    OK, everything is clear, I replaced the hdmi cable and it works without any problems, no interference, the old cable looks flawless, no visible damage
  • #19 20942146
    asiekspeed2
    Level 1  
    Posts: 1

    Hello, my new Hisense 42" UHD 4K TV dimmed after turning on or off the light in the bathroom, when the compressor in the refrigerator finished working, and the spark from the gas stove ignited the gas. After reading these posts, I bought a Baseus HDMI 2.1 8K 60Hz cable and the problem disappeared. It turned out It turned out that the old HDMI cable was no longer able to cope. The dimming problem disappeared.
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Topic summary

✨ A user reported intermittent dimming of their 55" LED Smart TV when lights in the bathroom or terrace are turned on, suspecting issues with the Wi-Fi connection or the NC+ decoder. Responses suggested checking the type of light bulbs used, as LED bulbs can cause electrical interference. The user confirmed that all bulbs are LED and mentioned that an electrician had previously checked the electrical installation. Further investigation revealed that the problem persisted even when the decoder was turned off, indicating a potential issue with the HDMI cable. After replacing the HDMI cable, the dimming problem was resolved, confirming that the old cable was likely the source of interference. Other users shared similar experiences, noting that upgrading to a higher quality HDMI cable also eliminated their issues.
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FAQ

TL;DR: Fast screen dimming when lights switch on is usually HDMI-related; one user had 0 glitches after swapping the cable—“it works without any problems.” [Elektroda, paradox2604, post #16938044]

Why it matters: This FAQ helps smart‑TV owners stop momentary blackouts caused by lighting or appliance interference, fast.

Who it’s for: People whose LED Smart TVs blink or lose signal when bathroom/terrace lights or appliances switch on.

Quick Facts

What’s the most common fix when my TV dims as I flip a light switch?

Swap the HDMI cable for a new, well‑shielded one. Users reported the dimming vanished immediately after replacement. Choose a certified, short cable and retest. “It works without any problems.” [Elektroda, paradox2604, post #16938044]

Why do LED bulbs or appliances make my TV blink?

LED drivers and switch‑mode supplies can inject brief interference onto nearby wiring. Poorly shielded HDMI leads act like antennas, upsetting the video link. A better‑shielded cable greatly lowers the chance of dropouts. [Elektroda, sylweksylwina, post #16935832]

How can I quickly confirm it’s the HDMI path and not Wi‑Fi or the TV itself?

Move the same source to another HDMI input, or unplug the set‑top box and test the TV alone. Changed behavior indicates the HDMI cable or port. [Elektroda, paradox2604, post #16935755]

Could a damaged HDMI cable really cause intermittent blackouts, not a total failure?

Yes. Small shielding or conductor faults can expose the link to bursts of noise. That yields momentary sync loss rather than a permanent outage. A user fixed it by replacing a bad cable. [Elektroda, robsonsw, post #16934835]

What cable spec worked for others with this exact symptom?

One user solved repeat dimming by installing a Baseus HDMI 2.1 8K 60 Hz cable. Any quality, well‑shielded HDMI 2.0/2.1 cable should suffice. [Elektroda, asiekspeed2, post #20942146]

Could my NC+ decoder or console be the cause?

Possibly. The OP saw differences by input and source. If moving the decoder to another HDMI input changes or stops the issue, suspect that path or its cable first. [Elektroda, paradox2604, post #16935755]

What’s a realistic trigger count I should watch for?

Track multiple triggers. One report logged three: bathroom light toggles, refrigerator compressor stopping, and a gas‑stove igniter spark. That pattern points to EMI susceptibility. [Elektroda, asiekspeed2, post #20942146]

Could cheap LED bulbs be part of the problem?

Yes. Lower‑quality LED lamps can be electrically noisy. If symptoms align with specific fixtures, test by swapping those bulbs or switching them off during trials. [Elektroda, KOCUREK1970, post #16929068]

How do I run a 3‑step isolation test before buying parts?

  1. Move your source to a different HDMI input and retest with the same light switch.
  2. Replace the HDMI cable with a new, short, shielded cable.
  3. Test with only the TV powered, then add devices one by one. [Elektroda, paradox2604, post #16935755]

Will changing only the TV’s settings help?

Settings rarely fix EMI‑induced HDMI sync drops. One user saw dimming even with just the TV on; hardware changes solved it, not software. [Elektroda, paradox2604, post #16931853]

What’s an edge case where a new HDMI cable won’t help?

If dimming persists across ports and cables, suspect installation issues or outlets. At that point, involve an electrician to inspect wiring and contacts. [Elektroda, 1098678, post #16925039]

Does using Wi‑Fi make this worse?

Wi‑Fi wasn’t the root cause in the thread. Changes tracked to HDMI inputs and cables, not to wireless features or settings. [Elektroda, paradox2604, post #16935755]

Is there a measurable success outcome from cable replacement here?

Yes. After swapping the HDMI cable, a user reported complete resolution with no further interference events. That indicates full recovery. [Elektroda, paradox2604, post #16938044]

Should I try surge‑protected or filtered power strips?

They can help when interference rides the mains. One user planned filters and better connectors, but HDMI replacement was the decisive fix reported. [Elektroda, robsonsw, post #16932876]
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