Vizio M65-F0 white light flashing on screen

[brandhr]

I have a Vizio 65” M65-F0 that was put into service during 02/2019 and is probably used less than five hours a week on average. The white light in the picture flashes on and off about once every two seconds no matter what I am using for the source. The sound and picture are fine otherwise— so very noticeable/annoying if the scene is dark, not as noticeable when the scene is bright. My questions are: 1. Will replacing the LED strips fix this problem or is it likely a board issue? 2. If it is an issue of replacing the LED strips, should I replace them all or can I just replace the one that is flashing? Thanks.

[xfox]

Re: Vizio M65-F0 white light flashing on screen

Those Vizio TVs have intelligent full array led blah-blah-blah, main board connected to led driver board with with digital protocol, so I would check driver first for that specific line

[budm]

Re: Vizio M65-F0 white light flashing on screen

https://cdn.badcaps-static.com/pdfs/...d842704c0c.pdf

See page 14
Try setting the the Pictures mode to Standard.
Auto brightness to off
Backlights level to 50%
Then see what will happen, you may have to do this on all input sources settings.

[neilc6]

Re: Vizio M65-F0 white light flashing on screen

I would turn off all the local dimming features.

Black Detail - Adjusts the average brightness of the picture to compensate for large areas of brightness. Select Off, Low, Medium, or High.
• Xtreme Black Engine™ - Based on the content, dynamically adjusts and balances the brightness and the contrast ratio of the picture by locally adjusting backlight zones.
• Clear Action - Reduces blur in scenes with fast action but limits the range for the Backlight setting.

[brandhr]

Re: Vizio M65-F0 white light flashing on screen

Thanks for all the responses. I made all the suggested setting changes and no improvement. As far as checking the LED driver board as suggested by xfox, that may be beyond my capabilities. I can generally follow YouTube videos on replacing boards/components but not sure how to check a board (other than looking for the tell tale brown/burned spot). I did find a YouTube video on how to replace the LED Light strips so thought I would ask to see if that could fix the problem. Looks like the LED driver boards are relatively cheap— would it make sense to try replacing that board? If that doesn’t fix it, would it make sense to replace the light strips? Thanks again.

[xfox]

Re: Vizio M65-F0 white light flashing on screen

If you have a multimeter just check voltage on blinking leds, if not, try new led driver board, just buy on ebay with return option...

[budm]

Re: Vizio M65-F0 white light flashing on screen

But did you try what we suggested you to try on post #3 & 4?

[brandhr]

Re: Vizio M65-F0 white light flashing on screen

But did you try what we suggested you to try on post #3 & 4?

. Yes, as stated I made all the suggested settings changes and no improvement. I do appreciate the suggestions.

[brandhr]

Re: Vizio M65-F0 white light flashing on screen

Thanks for the additional info on the board. I will order a new board and see if that fixes it.

[gavric]

Re: Vizio M65-F0 white light flashing on screen

I have same tv model that had appearance of 1/4 of horizontal backlight to be out just as picture bellow. After replacement of burned out led on that strip strip works but now it is flashing half of the strip that was initially out, same as original poster. It seems to be that led driver is bad because now swapping places with original strip it makes is flash also. I ordered led driver board 0171-2471-0172 and will update result when i see how it goes.

[nomoresonys]

Re: Vizio M65-F0 white light flashing on screen

Hard to tell what happened, brandhr never reported back. ??

[brandhr]

Re: Vizio M65-F0 white light flashing on screen

“Hard to tell what happened, brandhr never reported back. ??“

Yeah, sorry guys. I got distracted/lazy and never attempted to replace the board. Was planning on moving and was going to leave this TV for whomever bought my house, but the crazy housing market put an end to that idea. I’ve also actually gotten used to the flashing light and I really don’t notice it very often. That said, I will be interested to see if gavric is able to fix the issue with a new board.