@thkeith3rd this sounds like either a power board issue or a backlight array issue. Either way you would have to take it apart and take a closer look at the board. Make sure that there are no leaking, domed looking capacitors or any other obviously damaged components. Make sure that all cables are properly seated by removing them and the reseat. Check to make sure that there are no broken pins etc. on those contacts. after that you need a multimeter to measure the output on the different connectors and validate their values against those on the boards. Main issue I'd check is the connection of the LED's to the power board etc. Answer from oldturkey03 on ifixit.com
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Reddit
reddit.com › r/vizio_official › issues with vizio d series
r/VIZIO_Official on Reddit: Issues with Vizio D Series
August 8, 2019 -

For the last few weeks, I've had issues with my Smart TV where I turn it on with the remote and the power indicator light on the lower left corner will blink non-stop. So I'll immediately turn it back off, give it a few seconds, and turn it back on. I've also been having problems with needing to do a power cycle 1-2 times per week because it acts up, saying it's connected to wifi but wont connect to anything. I just got this TV for Christmas this past year. Is it normal for Vizios to do this or should I look into replacing it?

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JustAnswer
justanswer.com › tv-repair › nhqdg-new-vizio-series-40-inch-tv-second-tv.html
Expert Solutions for Vizio D Series 40 Inch TV Issues | JustAnswer
D Series 40-inch TVs often face HDMI input recognition problems and no signal display from external devices. To resolve HDMI connection issues on your Vizio D Series 40-inch TV, ensure the HDMI cable is securely connected to both the TV and ...
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 3198293 › windows-10-causes-my-40-inch-vizio-d-series-to-tur
windows 10 causes my 40 inch Vizio D Series to turn off for 10 to 15 seconds when I am on the internet. Does not happen when watching Netflix - Microsoft Q&A
My daughter bought me a 40 inch vizio d series right after black friday replacing an older monitor I was using with my computer. It worked great up until two weeks ago. First I had an audio out of sync by 3 seconds. I sent feedback. Next day sync was okay. I assumed some update was applied to fix it. Then later my tv started turning off for 10 to 15 seconds and then turning back on. Problem ...
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JustAnswer
justanswer.com › tv-repair › fvjt6-just-bought-vizio-40-inch-series-tv-unable.html
Expert Help for Setting Up Your Vizio 40 Inch D Series TV | JustAnswer
Sorry you're having problems. You will only be able to watch the Smart TV aspect of this TV with a router and an internet connection. Otherwise, you will need some sort of cable box, or antenna to connect to the TV in order to use it. That said, what is it that you're connecting to the TV? ... Understood. How is the DirecTv box connected to the TV? ... I bought one of those d series smart TV Vizio 40 inch I cannot seem to access my desktop Tower through the television
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Best Buy
bestbuy.com › site › reviews › vizio-40-class-d-series-led-full-hd-smartcast-tv › 6288347
Customer Reviews: VIZIO 40" Class D-Series LED Full HD SmartCast TV D40F-G9 - Best Buy
VIZIO - 40" Class D-Series LED Full HD SmartCast TV
Discover a world of entertainment with this 40-inch VIZIO smart TV. It provides easy access to streaming apps such as Netflix and more than 100 free channels, and the Full HD resolution, full-array LED backlighting and effective refresh rate produce immersive image quality. This VIZIO smart TV has a USB port and HDMI inputs to connect additional media sources. ·
(4.2)
Price   US$39.99
Find elsewhere
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iFixit
ifixit.com › Answers › View › 745823 › vizio+d+seres+40in+tv+has+black+screen+and+then+powers+off
vizio d seres 40in tv has black screen and then powers off? - Vizio Television - iFixit
I have recently bought another main board for this model and installed and still same issue it turns on and i can see it powers on and if I use a light can see the vizio logo on screen but it will turn it self off a few seconds after i turn it on.
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Reddit
reddit.com › r/vizio_official › new here. i have a question regarding the vizio d series 40 32"
r/VIZIO_Official on Reddit: New here. I have a question regarding the vizio D series 40 32"
July 12, 2021 -

Please don't dis me for doing this but I'm using my Vizio D-Series 32" TV also as a monitor. Model D32h-J09. The laptops I'm using are an ACER and moving to a Dell. Both have decent graphic cards and of course can both be connected via hdmi. Not both at the same time but moving one to another. The problems I've noticed is that when the ACER and Dell are connected to the TV they cannot get to the same resolution. The ACER is set at 1366X768, not sure what the Dell is set at but either way I can't get them set so I can get the image on either one to fit the screen properly. This is just annoying but not the main issue.
When connected to the ACER, the ACER works fine for a while then will randomly crash. This is more than annoying, could it be that the ACER graphics driver needs to be updated with a Vizio driver or is the TV too much for the laptop?
Also using the dell I didn't have the problem with it crashing but the image from the laptop to the TV just wouldn't fit no matter what resolution I tried. Is there a specific driver to fix this or is there a workaround?
BTW the Dell crashed earlier in late January when we have a power glitch. Burned out the TPM chip and I just got it back from Dell. Fortunately it was under warranty.

Any assistance would be greatly appreciated.

Thanks.

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JustAnswer
justanswer.com › tv-repair › mx13f-bought-one-series-smart-tv-vizio-40-inch.html
Expert Help for Vizio 40 Inch Smart TV Issues | JustAnswer
D Series TVs may not recognize desktop input or have difficulty switching HDMI sources correctly. To access your desktop on the Vizio D Series TV, ensure the HDMI cable is securely connected to both devices.
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Good Sam Community
community.goodsam.com › good sam community › forums › rv must haves
Brand New Vizio 40 inch TV problem, HELP | Good Sam Community - 3404158
They said it would cost me $100 if they sent out a Geek techie,...OR I could have another 40 inch Vizio, in the new sealed box. I connected the new one, with same results! I tried it with my two other Direct TV receivers, with same results. I replaced the co-ax cables, with same results,...NO SIGNAL. I connected, one by one, ALL my other TVs, total of five. They all receive Direct TV just fine. Is this model Vizio simply not compatible with Direct TV signal?
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JustAnswer
justanswer.com › tv-repair › fqmhc-vizio-smart-tv-model-d40f-g9-won-t-turn.html
Troubleshooting Vizio D40f-G9 TV: Won't Turn On and Other Common Issues
D40f-G9 often shows faint power light and fails to fully power on or randomly shuts off. A fading power light on the Vizio D40f-G9 usually indicates a failing power supply board or capacitor issues.
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Tom's Guide
forums.tomsguide.com › home › electronics & wearables › streaming video & tvs
I have a Vizio TV model D40-D1 the remote won't work. And it don't have a power button on the TV. Help! | Tom's Guide Forum
November 6, 2017 - You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. ... I have a Vizio TV that the remote won't work, there is no power button on the TV.
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JustAnswer
justanswer.com › tv-repair › codg7-vizio-40-inch-series-television-won-t-turn-on.html
I have VIZIO 40 inch D series television, won't turn on. ...
I have a 40 inch Samsung LCD television that won't turn on. There is a red flashing light on the front. My Vizio 50 inch d series tv won't turn on. I've unplugged it and checked all the wires and I can't get it to turn on. ... Unfortunately, the TV has an internal problem, and to fix this would require partial disassembly of the TV, voltage testing, and board purchase and replacement.
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Reddit
reddit.com › r/carverscave › vizio d40f-j09 40-inch d-series smart tv review: the budget tv that doesn't suck (surprisingly)
r/carverscave on Reddit: VIZIO D40f-J09 40-inch D-Series Smart TV Review: The Budget TV That Doesn't Suck (Surprisingly)
April 2, 2024 - Some Streaming Issues: A few people have reported problems with Chromecast. I didn't have any issues, but your mileage may vary. Picture Settings: Out of the box, the picture is a bit wonky. You'll need to fiddle with the settings to get it just right. If you're looking for a cheap TV that doesn't look like it belongs in a landfill, the VIZIO D40f-J09 is worth a look.
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Reddit
reddit.com › r/vizio_official › why does my sharpness go away? new vizio d series 40" smart tv.
Why does my sharpness go away? New Vizio d series 40" smart tv. : r/VIZIO_Official
February 1, 2023 - On some the opposite happens, if there's no motion it will be very sharp, but when the game starts moving the sharpness dissipates. This didn't happen on my 6 year old Vizio TV. ... And tell me if that fixes the problems because if it doesn't the it could just be the game has motion blur.
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TVsBook
tvsbook.com › forums › tv forum
VIZIO D-Series Smart TV: Is 1080p Still Enough in a 4K World? Discover the Balance of Quality and Affordability! | TVsBook
December 16, 2024 - And don’t even get me started on the smart features. They’re kinda cool, but they’re also super clunky. It’s like they’re stuck in molasses—takes forever to respond and crashes way too often. Seriously, like 40% of the time! What a bummer! ... So, I’ve got three Vizio TVs that I just picked up, and guess what?
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Vizio Support
support.vizio.com › s › article › D40f-J09-Model-Information
VIZIO Support
The VIZIO Support homepage provides the latest trending support topics and support videos, user manuals, product registration, along with tech specs and troubleshooting steps.