Re: Vizio M70-C3 Dark Spots
Just make sure there is a "full white" screen being displayed in case there is local dimming...
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Re: Vizio M70-C3 Dark Spots
probably the "easiest" way would be to measure the voltages going to the strings and compare the results.Leave a comment:
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Re: Vizio M70-C3 Dark Spots
I believe that model has local dimming, which means it has smaller individually driven strips. I'm guessing that when you open it up you'll find 6 or 7 strips with all or some LEDS not working. Just a guess though. I've done a few of those 70" C3's but it's been a while.Leave a comment:
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Re: Vizio M70-C3 Dark Spots
What I would do is take the back cover of the TV off, locate each row of LED strips then compare their position in the TV to the on-screen position of the dark spots. I see two separate streaks of dark very close to one another. Mostways I've seen bad LED's don't seem to look like that.
Before scrapping the TV I'd pull the flap and check the backlights anyhow by leaving the boards on it, pull the flap and fire it up with the power button.Leave a comment:
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Re: Vizio M70-C3 Dark Spots
The dark spots are too squarish to be sandwich layers. I think some of your backlights are out. It's sometimes possible to peak in a top corner to confirm (rather than opening the whole thing up), but as others have said be very careful. I've even snuck in one of those usb cameras from the backside on rare occasions.Leave a comment:
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Re: Vizio M70-C3 Dark Spots
If you take it down to backlights be very careful not to force anything, the screen is very flimsy and breaks very very easily, those suction cups from harbor freight or ebay seem to work pretty good for the job also maybe check some youtube videos before you tackle it.Leave a comment:
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Re: Vizio M70-C3 Dark Spots
this VA panel i don't think so the issue with LED backlights to me the Sandwich layers of the panel are the issue.. wish i am wrong so you can safe it. take screen apart and check the back light id burnt or weak or some are offLeave a comment:
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Re: Vizio M70-C3 Dark Spots
Sure looks like weak or burnt out leds in the backlights.Leave a comment:
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Vizio M70-C3 Dark Spots
Hello, brand new to the site and hoping I can learn what may be going on with my TV. The TV is working just fine, however, when a screen shot of white clouds came on the other day, I noticed several dark areas as shown in my attachment. My first guess was maybe an LED issue, but then I though I should research a bit more.
Like I said, brand new to the site, pretty technical and not afraid to take things apart and repair, cars, PC's, etc.
Can someone please steer me in the correct direction?
much thanks,
KentAttached Files -
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I have a Vizio M70-D3 4K with a dark spots backlight issue. It is using the Y8387248A backlight driver board.
On this model each of the 64 transistor powers 2 LEDs. Using my TKDMR TD3H backlight tester I've determined that the backlight LED strips were the issue, and the backlight driver board was just fine. Some LED pairs required 5.9 volt at 155mA, some required 9.5 volt and some were completely open.
I've removed the LCD panel and once the LED strips were exposed I've tested them again by connecting my LED tester directly on the test pads. To my surprise all, I've... -
Hello there i have a Sharp 80" LDC that has some dark spots in the middle of the screen, since its a 80 inch need another person so hang it on the wall or move it around, so i hope the collective wisdom can help me to determine what is wrong, I've been doing some research online and there is next to nothing about this TV, i tend to believe that the spots are due the back films/diffuser sheets, that are bit dirty, or perhaps one or two LEDs being burned, but what throws me off is that the dark spots are more noticeable when the image is bit dark like night scenes, and also noticeable when...06-13-2023, 12:02 PM -
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... -
Hello Everyone,
This is my first post so I will try to be as precise as possible without making this post too long winded. Unfortunately I don't have pictures of the original problem but I included images of the TV internals.
I have a Sharp 70LE660U. The problem started a few months ago with the bottom row looking out of sync and was dark on the left side and then fading to transparent on the right side. Shortly after, a dark cloud appeared in the center of the screen. The dark cloud started small and shaded but the image was visible. It also affected the menu area.... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?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...
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