How to be sure I need new backlights

Question

Vizio Television

Repair guides and support for LED, LCD, HD and other Vizio TVs.

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Al VanBruggen @alvan

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crwdns2931729:0crwdne2931729:0: Maw 29, 2017

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How to be sure I need new backlights

Vizio E60C3

Have several dark bands on the screen. I see that the backlights for this tv come in 12 strips. My question is can I have half of one of the strip out when the other half is light?

All of the lower right half of the screen and a band adout 3" wide in the center of the left half are dark. Very noticeable on white screen. I still have a picture just very dark. The dark areas extend exactly halfway across the screen as if the backlight strips are half lite.

Excuse my question but if the power supply were to fail wouldn't I loose all the lights?

Thanks

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@alvan thanks for the image. Odd looking but I would go with failed backlight as well. Now you have to check if it is the lights or the power to the lights.....

crwdns2934271:0Maw 30, 2017crwdnd2934271:0 oldturkey03 crwdne2934271:0

That sounds exactly consistent with either a wiring problem (the wires leading to the LED strips) or a problem within the strips themselves. If the power supply got roasted, then it would have failed to power up any of the strips.

It's easy enough to test. Figure out what the power supply voltage is, then rig up the same voltage power supply (wall wart?) and try to power each strip one at a time.

Or... just unplug all of the strips except one from the TV and try powering up the TV that way. If that strip works fully, try doing the same thing with the next strip, then the next, until they're all tested / verified. If ONE strip fails to light completely when it's the only one powered up, and if wiggling the wires doesn't change anything, then the strip itself has failed. If wiggling the wires makes it flicker or work, then the wiring is the problem.

crwdns2934271:0Dzi 3, 2025crwdnd2934271:0 Tim Hofstetter crwdne2934271:0

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@alvan thanks for the image. Odd looking but I would go with failed backlight as well. Now you have to check if it is the lights or the power to the lights..... — oldturkey03
That sounds exactly consistent with either a wiring problem (the wires leading to the LED strips) or a problem within the strips themselves. If the power supply got roasted, then it would have failed to power up any of the strips.

It's easy enough to test. Figure out what the power supply voltage is, then rig up the same voltage power supply (wall wart?) and try to power each strip one at a time.

Or... just unplug all of the strips except one from the TV and try powering up the TV that way. If that strip works fully, try doing the same thing with the next strip, then the next, until they're all tested / verified. If ONE strip fails to light completely when it's the only one powered up, and if wiggling the wires doesn't change anything, then the strip itself has failed. If wiggling the wires makes it flicker or work, then the wiring is the problem. — Tim Hofstetter

score 3 · Answer 1 · 2017-07-29T10:41:27-07:00

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oldturkey03 @oldturkey03

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crwdns2931729:0crwdne2931729:0: Maw 29, 2017

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@alvan could be that your LED strips have failed but it could also be that the power board is not supplying power to the strips. You'll have to unplug your set and remove the back. then check the power board. Look for any obvious damage like leaking, domed or burned caps. Post some images of what your boards look like

as well as what your screen displays, with your question. That way we can see what you see. Use this guide Adding images to an existing question for that

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M Hood @mhood99947 crwdns2934065:0crwdne2934065:0: 37 1 · Answer 2 · 2019-03-07T19:33:33-07:00

M Hood @mhood99947

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crwdns2931729:0crwdne2931729:0: Kul 7, 2019

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My E60 Vizio was doing the same thing, eventually my TV went black. I ordered the backlight strip set from ShopJimmy followed the instructions on the video and fixed my TV. Check out the video on YouTube. Good luck be patient and take your time.

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My TV looks like the one above, it is Vizio E70-E3. The 12 LED backlight strips appear to be controlled in sections of three Strips (each strip is 10 LEDs of 3V DC apiece). The pic above shows the lower right quadrant failing (one section of three strips). On my TV it was lower right and then a month later the top right also went dim.

Important - the dimmer strips appear to be working still, but they are just dimmer. If I use the "backlight" adjustment I can see them working but they remain about 50% DIMMER than the rest of the TV.

When I look at the main power board I see there are 4 LED voltage control outputs (indicating four sections as I said).

But what I can't determine is whether it is the LED strips or the power board which is bad, or maybe even the T-Com board. It has been really hard to find information ion this specific problem online.

Please feel free to email me at motterpaul "at" gmail dotcom if you have any ideas about this.

crwdns2934271:0Yan 6, 2020crwdnd2934271:0 Paul Motter crwdne2934271:0

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Paul Motter @paulmotter crwdns2934065:0crwdne2934065:0: 1 1 · Answer 3 · 2020-02-06T15:24:25-07:00

Paul Motter @paulmotter

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crwdns2931729:0crwdne2931729:0: Yan 6, 2020

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My TV looks like the one above, it is Vizio E70-E3. The 12 LED backlight strips appear to be controlled in sections of three Strips (each strip is 10 LEDs of 3V DC apiece). The pic above shows the lower right quadrant failing (one section of three strips). On my TV it was lower right and then a month later the top right also went dim.

Important - the dimmer strips appear to be working still, but they are just dimmer. If I use the "backlight" adjustment I can see them working but they remain about 50% DIMMER than the rest of the TV.

When I look at the main power board I see there are 4 LED voltage control outputs (indicating four sections as I said).

But what I can't determine is whether it is the LED strips or the power board which is bad, or maybe even the T-Com board. It has been really hard to find information ion this specific problem online.

just now by Paul Motter

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Paul Motter very unlikely to be a T-con board error. You need to measure the individual LED outputs on your power board to see if they are essentially all showing the same values. Let us know what you find out.

crwdns2934271:0Yan 6, 2020crwdnd2934271:0 oldturkey03 crwdne2934271:0

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Vizio Television

How to be sure I need new backlights

Update (07/29/2017)

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