Vizio M70-C3 Dark Spots

[budm]

Re: Vizio M70-C3 Dark Spots

Yep, 70" panel is big and not easy to handle.

[budwich]

Re: Vizio M70-C3 Dark Spots

yes that would have been the wise thing to do BUT post 39 was the end result of a "first timer work on a very large panel".... and now the set is basically of no value / not working. :-(

[budm]

Re: Vizio M70-C3 Dark Spots

In OP post #1 "The TV is working just fine" so if OP keeps using it the way it was and replace the LED's later om when it is not acceptable any more.

[budwich]

Re: Vizio M70-C3 Dark Spots

???? The tv no longer works as in NO picture because of the crack. At best he could only get half the screen to display now because the other half with the crack won't display.

[budm]

Re: Vizio M70-C3 Dark Spots

Oh I know about the crack screen, what I try to say that OP could use the TV with some LED's string not working and use it until other LED's failed to the point of unable to use the TV any more then open up the screen at that point since there is no other choice left.
The LED strings could also be tested as suggested in post 19.

[budwich]

Re: Vizio M70-C3 Dark Spots

I think you missed the post about "won't power up" because of the crack screen. :-(
basically, now only the cards can be salvage ... along with the led I guess.

[budm]

Re: Vizio M70-C3 Dark Spots

At least we know it does not have open LED circuit detection so the good LED's are still working and allow you to at least able to use the TV.

[nomoresonys]

Re: Vizio M70-C3 Dark Spots

Bummer, if you could find a similar nonworking model with a good screen, maybe you could transfer the parts.

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

Thanks again guys, it just torks me because I was very methodical, labeled everything, etc, took special care of the screen. Seemed to be a crack in the lower left hand corner, almost the size of a thumb so maybe a grabbed it here too hard? idk could I have not have it centered perfectly and tighten down the bezel inappropriately? Perhaps I will never know the real reason it cracked. Anyway, in hind site, like Budm said, maybe a dark spot or two better than no darks spots? Well....I tried my best and learned alot, maybe I should look at it as a 6 hour workshop...

[nomoresonys]

Re: Vizio M70-C3 Dark Spots

Sorry to hear, it's not easy, they are breaking left and right.

[budwich]

Re: Vizio M70-C3 Dark Spots

guess the dark spots were better than no spots... :-( very disappointing.

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

just when things were going so well, got the new LED's installed, powered up and all good. I put everything back together and fired it up and no joy, left side of screen was all white and the other side had a picture. So my first thought was the 4 ribbon connectors, so took apart again, re-seated them and put back together. Hung on the wall and fired up again, bottom left corner, screen cracked, wont power up, Game Over! sigh...appreciated all the help guys!

[nomoresonys]

Re: Vizio M70-C3 Dark Spots

Take it slow, if unsure watch some youtube vids.

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

OK...sigh...now that everyone, including me has had a good laugh at the rookie. I powered on the set at TV and YES!, I have backlights that are out! Replacing now....wish me luck

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

Top tip: make sure that before you attempt to turn it on you have isolated the tconnribbons. I learned the hard way that if you disconnect them from the panel but leave them connected to the tcon they can short against the body of the TV and take out your tcon.

When you attempt to turn it on as normal, they don't turn on?

Great, thank you. no, plug it in and turn on the power but no LED's, but if all the ribbons and IF filter, etc, etc are disconnected , how does it get the signal?

[jjanssen7]

Re: Vizio M70-C3 Dark Spots

Top tip: make sure that before you attempt to turn it on you have isolated the tconnribbons. I learned the hard way that if you disconnect them from the panel but leave them connected to the tcon they can short against the body of the TV and take out your tcon.

When you attempt to turn it on as normal, they don't turn on?

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

OK Guys, I have decided to tear it down and look at the LED's. And now for perhaps the dumbest question ever. I would like to plug in and look at the LED's for which ones may be bad. I plugged in, but how do I get them to light up?..sigh...

[Charleyd]

Re: Vizio M70-C3 Dark Spots

Looks like backlights. I had one of these that had gotten hit by lightening. Minor damage to Power Supply that cost $8 to fix, but then 1/3 of the backlights were out. Not fun. A good test video can be found on YouTube by searching for "Monitor Color Test".

[Diah]

Re: Vizio M70-C3 Dark Spots

It was off, pictured left at calibrated for test, backlight=zero

not good news 4 reasons
1- software issue ( local dimming blocked ) hard reset from service menu can approve it
2-LED driver replacement
3- Led strips ( must all replaced with new one )
4- panel sandwich layers

[kentkirchner]

Re: Vizio M70-C3 Dark Spots

I will be removing the back and taking pictures and posting tomorrow morning