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Persistent Screen Backlight on Samsung J3 2016: Battery Drainage Causes and Fixes

szymonraszke 2775 11
Best answers LABEL_AI_GENERATED

Why does the Samsung J3 2016 seem to have a permanently lit screen/backlight that drains the battery, and can it be fixed?

On the J3 J320FN, that is not a normal backlight problem because the original display is AMOLED, so if the screen looks faintly lit when it is off, the phone likely has a non-original Chinese LCD replacement installed [#16608054][#16608121] The thread also notes that Samsung only switched the J3 to TFT in the 2017 version, so a J320FN should still have AMOLED hardware [#16608642] The suggested fix is to install the original display again, after which it should work normally [#16609762]
AI summary based on the discussion. May contain errors.
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  • #1 16607457
    szymonraszke
    Level 16  
    Posts: 490
    Rate: 65
    As in the topic in J3, the screen backlight is on all the time, even when the phone is dimmed, so the battery drains very quickly. What is the cause of this and is it worth fixing?
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  • #2 16607504
    sm233
    Level 38  
    Posts: 2933
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    In J3 the display is Amoled so there is no backlight.
  • #3 16607585
    szymonraszke
    Level 16  
    Posts: 490
    Rate: 65
    So why if I lock the phone and look against the light, I can see that it is on, even though it is black all the time?
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  • #4 16607588
    sm233
    Level 38  
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    Take a picture of what you mean, we will sooner understand what the problem is.
  • #5 16607818
    szymonraszke
    Level 16  
    Posts: 490
    Rate: 65
    It is not very visible in the photo. It's just that the display, when locked, is black, but if it is against the light, it is as if bright from the bottom, it turns completely off only when you remove the battery.

    In the second photo, the phone is blank but turned on. You can see best what is happening in the lower left corner
    In the first photo, the phone is turned off completely
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  • #6 16607906
    sm233
    Level 38  
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    The question is whether you have a Chinese equivalent of the display mounted there, but made on an ordinary LCD. Have you installed any display replacement there?
  • #7 16608054
    kris8888
    Level 41  
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    sm233 wrote:
    In J3 the display is Amoled so there is no backlight.

    J3 in 2016 version no longer have Amoled display, it has regular TFT
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  • #8 16608113
    sm233
    Level 38  
    Posts: 2933
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    kris8888 wrote:
    sm233 wrote:
    In J3 the display is Amoled so there is no backlight.

    J3 in 2016 version no longer have Amoled display, it has regular TFT


    J3 in the 2016 version, i.e. the J320 model with different tips, has an AMOLED display originally mounted, exactly the same model that is used in the J500, only the glass is different. Everything on the LCD is a Chinese invention and their way of preventing cheap counterfeiting of AMOLED displays.
  • #9 16608121
    makosuu
    Network and Internet specialist  
    Posts: 2984
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    The display is definitely a Chinese replacement, the J3 has an Amoled screen that has no backlight.
  • #10 16608642
    kris8888
    Level 41  
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    Sorry, I was actually wrong, it was only in the 2017 version that Samsung swapped Amoled for TFT in J3. Maybe the author of the topic has the J3 2017 version after all? Or someone, as part of the "repair", pressed the guts of J3 2017 into the housing from J3 2016
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  • #11 16609746
    szymonraszke
    Level 16  
    Posts: 490
    Rate: 65
    The sticker under the battery shows j320fn. So it can be fixed or not?
  • #12 16609762
    sm233
    Level 38  
    Posts: 2933
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    Rate: 434
    Put on the original display and you'll probably be fine.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around the persistent screen backlight issue on the Samsung J3 2016 model, which leads to rapid battery drainage. Users clarify that the J3 originally features an AMOLED display, which does not have a backlight. However, there are concerns that a replacement display, possibly a cheaper LCD variant, may have been installed, causing the backlight to remain on. The original poster indicates that their device is identified as J320FN, suggesting it may have been modified or repaired incorrectly. The consensus is that replacing the display with an original AMOLED screen could resolve the issue.
AI summary based on the discussion. May contain errors.
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