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What's included in the Box HDTV Power Cord Quick Start Guide XRT122 Remote Getting Started E40-C2 Tech specs Physical Properties Model Information Dimensions w/ Stand: 35.71"x 22.73" x 8.27" Dimensions w/o Stand: 35.71" x 20.57" x 2.60" Remote Model: XRT122 Packaging Dimensions: 38.82" x 24.33" x 5.12" Remote Connectivity: IR Weight w/ Stand: 16.09 Lbs. Weight w/o Stand: 15.43 Lbs. Weight w/ Box: 22.05 Lbs.

Preguntas 4 Ver todo

Why is my tv turning on then off then on then back off?

So the tv is turning on, the vizio logo appears then instantly go black then it shows the screen again like its on a channel then back off. Tried taking out the batteries in the remote, unplugging it and back in, unplugged it and held power button for 1 min and plugged it back in, pushed the power button like 20 times or more, tried a different controller, all same results over and over again.

Update (01/12/2022)

Just trying to turn on, just flashes like this @oldturkey03

Update (01/22/2022)

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Update (01/22/2022)

Inside

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Update (01/23/2022)

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Update (01/23/2022)

Disconnect this?

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@oldturkey03

Update (02/07/2022)

Ok @oldturkey03 I just got the new board in, hooked it up and now the (power) white light stays on for maybe a second or 2 longer and has a little slower fade but the picture does the same thing except now I don't see a second flash. I even unplugged the video ribbon cable and same result.

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@helpmeplease_20 do you have any audio? When you say your TV turns off does it turn off or is it just your screen that turns black? What does the power LED show? When the screen is black shine a flashlight beam at an angle against the screen. See if you can make out any shapes etc. When you "unplugged it and held power button for 1 min and plugged it back in, " did you disconnect All Devices? Firestick etc as well as cable or sat box?

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When your TV is repaired, make sure it is well ventilated to avoid it overheating.

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@oldturkey03 Ok, so I just replaced the main board and still doing same thing. Posting a video now.

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@helpmeplease_20 shine a flashlight beam at an angle against the screen. See if you can see the Vizio symbol or anything else on this screen. This could be a backlight issue since it flashes quickly. Looking at your Power LED it actually turns off and back on. Since you already replaced the main board you need to check your power board. Typical Vizio, nothing easy :-)

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Just trying to turn on, just flashes like this @oldturkey03

[video|3763]

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2 Respuestas

@oldturkey03 Unsure about audio. I believe the tv turns off but not sure. The power indicator is white when I hit the power button and then slowly fades off after like 1 sec. Nothing is connected to the TV. I did take all the screws out, popped the back cover off, and took out the main board and it is burnt as indicated on the back. Ordering a replacement board and will post a update after installation. And for the flashlight deal, guess I didn't think of that. Will try that next time but for now, since the board is burnt I'd rather not put everything back together lol.

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@helpmeplease_20 "took out the main board and it is burnt as indicated on the back" good indication that the Main board is toast. Post some images if you don't mind. Just to see what area of the main board has failed. Agregar imágenes a una pregunta existente

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@helpmeplease_20 It's a Vizio so no surprises there :-) I have not seen a single board setup but it is of course possible. There is a reason why Vizio does not supply any service manuals etc. remove the cover from the back of your TV and post some pictures of what you see. Edit your QUESTION to add images Agregar imágenes a una pregunta existente

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I currently have the exact same model and so far as I can tell the exact same issue.

My research thus far seems to indicate that some of the LED driver components on the power/main combo board are most likely bad, specifically the voltage regulators (of which there are quite a few in the LED driver portion of the board). I found a random post on an old TV repair forum where someone chimed in stating that the voltage regulators are notoriously bad on all Vizio TVs manufactured around this period of time, they seem to fail most often when the TV is moved. The same poster then later stated that people selling spares on Ebay RARELY, if ever, test the boards beyond the power indicator light coming on and behaving as expected.

So this makes me believe that your replacement board could also be suspect, and should not be considered 100% good, known working.

I am eventually going to try testing and troubleshooting the LED driver components on mine. Currently trying to run down whatever diagnostic info I can (and look up data sheets on the VRs that are present on the board), hard to test if you don't know what you should be testing for.

Detail of my TVs problem and my logic (please question my logic if you see any potential problems).

Symptoms:
1. Power indicator light behaves normally.
2. Backlight comes on during initial boot (vizio logo) for ~1sec (lights evenly and, as best I can tell, a normal brightness)
3. Backlight goes off after ~1sec
4. Backlight comes back on for ~1sec when TV displays initial input setting/info (again evenly and at reasonable brightness)
5. Backlight goes off again after ~1sec
6. Screen displays "no input", "no channels programmed", or good input signal properly (but obviously without backlight)

Logic:
1. LED backlights do briefly come on and appear normal, thus I believe they are OK.
2. Video inputs, panel display, power indicator and remote functions operate normally, so IR/etc. board, power button board, TCON board and functions on the power/main board, other than the LED driver, all function normally. So that really only leaves the LED driver portion of the power/main board as the culprit.

I have read accounts of the LEDs themselves failing which results in portions of the screen being dark, or the screen never lighting up at all.

And by all accounts you replacing the power/main board with a known good one should have fixed it. But given that this is a very common problem with all stock E40-C2 boards, and parts sellers are not 100% about testing full functionality of their parts...

I will try and run down enough diagnostic info to test the state of my board in the next week or so, will relay that info here once I have it if you want to test your board(s). And will report back with any further successes or failures as they occur.

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