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Vizio m55-D0 dark corner - Backlight?

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Hello! I have a Vizio smartcast m55-D0 television. Bought it 2 years ago and randomly this dark rectangular area appeared in the bottom left corner of the display. No other issues. I’ve tried power cycling it, changing HDMI cables, firmware updates, etc.

There’s limited info out there about this specific issue with this specific model of TV but it seems like it may be a backlight failure. I see led replacement strips sold online but I just want to be sure this is the problem (and find the correct part) before forking over the cash and spending the time to fix it, as it seems to be a pain to do. Could it also be a power supply issue or something else?

Thank you for any help!

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I have Vizio m65-d0 with the same issue. Commenting here to follow the thread. Will update if I find any info.

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My TV is having the same issue. Any update from anyone who previously posted in this thread?

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No updates yet. I, unfortunately, got used to it and have been busy. I do intend on revisiting this issue at some point. If anyone solves it, please report back!

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@danielme

this looks odd for a backlight strip failure. Possible, but odd. Check the power board and measure the voltages on the LED output. See if they are all the same. If so it could be your backlight strip. If not then I would consider a new power supply first. Check all of your cables as well since Vizio has issues with bad solder connections on the cable connectors.

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Thanks for the response! I really appreciate it. Any links you can shoot me that might shed some light on how to check the power board and where to look out for the bad solder connections?

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Vizio uses a hodgepodge of parts. If you can post some images of your boards I can try and get you the schematic or at least point out where/what possibly to check. Use this guide to add pictures to your original question iFixitでの質問に画像を追加する方法

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You certainly can have individual led lights on a strip go out. Usually they are next to each other but can be separated .

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It requires opening the tv up to ascertain whether a full strip is out ( indicating power to the strip may have failed but could be all led on strip have failed. If only one or more on a single strip are out with some working then power is good but lights are not. Individual lights can be replaced but easier to replace strip. In any and all circustances check power for the light to be within range before purchasing or installing new.

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I have the same problem. I know a little. I see the power board has 4 separate voltage feeds to handle 12 LED strips (so each one handles three strips of 10 LEDs just like yours, I have an even number of LEDs that have turned off (I have six strips off all-together and they are the upper left corner and the lower right corner - so it looks like the power supplies are failing, more so than the LED strips, although it could be either.

Generally, LEDs do not die unless they get too much voltage. Mine appear to be still working because I cab dim them, but I can’t make them bright enough anymore. I can pretty much tell the full strips are the same.

So, my inclination is to test the power supply board first. You take a voltmeter and put - to ground and put + to the voltage send (#2,3,4 or 5) on the ribbon cable. A good one should read no more than 30v DC. If this does not work put three 9v batteries in series (total current = over 27V DC) and go to the LED strips and see if you can light them with the batteries.

If the dim strips are actually good - replace the power supply board.

https://www.youtube.com/watch?v=ocyEZ5eK... - how to test LED strips

https://www.youtube.com/watch?v=4pK6o2DM... - how to build a battery tester for LED strips

Update (02/02/2020)

Oops - for 3 strips maybe that power supply should read out 90v DC to power 3 strips, but the battery tester is made to only power one strip, so 27 V is fine.

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Daniel さん、ありがとうございました!
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