Vizio M420NV no backlight

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  • Tynan Dill
    Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
    by Tynan Dill
    I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

    Upon bringing it home and plugging it up, it showed a standby light.

    I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

    The screen seems to blackout and stay black, but with a flashlight I can see the display.

    With my Playstation 4 connected via HDMI, and running a game I can hear sound.

    Assuming...
    ORIGINAL POWER SUPPLY BOARD
    7 Photos
    11-22-2024, 01:46 PM
  • howardc64
    Vizio E55-F1 dark backlight zones. LED failure or Dimming Zone Driver?
    by howardc64
    Problem

    Fixing a dimming zone TV with LEDs not lighting up. Dimming zone circuit introduces added variable to diagnose LED and/or Dimming Zone Driver board? Some 1/2 rows of LEDs appears to be out in active dimming zone off AND some brightness flickering with active dimming zone high while playing changing video



    Model & Board Pics



    Conflicting Spec

    Vizio indicate this TV has 10 dimming zones. However, LED strips and Zoned light driver connector suggest 12

    https://www.shopjimmy.com/vizio-gj-2k1...
    10-10-2024, 01:16 PM
  • triplefour
    UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
    by triplefour
    this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
    i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
    unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
    according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
    09-13-2023, 10:43 PM
  • JaquesPratt
    Vizio D32f-E1 Powers on, has backlight, won't boot/no logo, no menu or video
    by JaquesPratt
    I have a Vizio D32f-E1 LCD TV that does NOT have a TCON board.

    This TV recently went through some 'death throes' and now won't boot. The first problem that began to manifest was while watching tv, the screen would 'freeze', and the image would dim over a few seconds until it was very dark. HOWEVER, the audio of the show would continue as normal. I could power off the TV for 5-20 seconds, power back on, and the video would be normal. This would occur 1-3 times when the TV was first started, and would not happen again after the TV was 'warmed up'. Not ideal, but this glitch was manageable....
    07-16-2024, 01:04 AM
  • Mectronik
    Vizio m601d-a3 backlight issue
    by Mectronik
    Hello, I'm working on a Vizio m601d-a3 with a backlight issue that I am having a difficulty diagnosing it. As it sits, the tv powers on, displays the Vizio symbol and with nothing hooked up it will then display no signal but you can only see half of the screen. I know it's a back light issue because the picture is there without light behind it, as I can see it by doing a light test. I've taken off the paneling and done a visual inspection. If I disconnect the tcon ribbon cable to the affected side then the entire half of the screen goes away. I've checked voltages at the LED driver from the main...
    11-05-2023, 10:20 PM
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