Vizio E701i-A3

[Chicd]

Sound, backlight, no picture. Replaced the Tcon and power board. After power board replaced, power led now stays on. Noticed when I removed board there were three mounting screws missing. Are these necessary for proper board grounding etc.? Still no picture. Noticed when 'input' or 'menu' button pressed, panel brightens a bit...any help?
Tcon board does NOT have any Z designation on it...think it has to be a particular board...?

Any way to verify panel is good?

[GoneGault]

Re: Vizio E701i-A3

I saw this posted elsewhere; the led's themselves may be bad.
"So, specifically for you, if his panel is half lit, it's probably a bad LED string, and no problem with the panel. You should be able to swap panels (CAREFULLY!!!), and be good to go. Try to get a pic of his screen in the ON state. If there is a straight line down the middle, and half works and half doesn't, he might have connections issues with the panel and T-con. If there is a dark triangle at the bottom of the screen (about two feet long at bottom, peak of dark triangle about a foot above bottom), then it's a bad LED string.
In my case, there was absolutely nothing wrong with the panel, or the boards. There is a strip of LEDs that are pretty difficult to get to. About 50 screws, I'd estimate (though I don't remember, and don't have the TV anymore, could be closer to 30). With enough patience you can get the LED strip out. If you are able to CAREFULLY lay the TV flat on it's face, remove all the screws on the rear casing, pry-separate the front bezel from the rear casing, disconnect all the ribbon cables along the side and bottom of the LCD panel. Then either CAREFULLY remove the extremely thin and VERY FRAGILE lcd panel from the rest of the TV (or) remove the rest of the TV from the VERY FRAGILE and thin lcd panel. From here you will see a large glass (plastic?) panel in front of white reflective plastic film. Remove both of these carefully. (NOTE: if you bend the white reflective plastic film, this will cause the very common large white spots in your picture.) After the reflective package is out you will have access to the 3 LED strips along the bottom of the TV. Unplug and remove the strip that is faulty. In my case, the dead LED was visibly cracked, so it was easy to find. If they all look ok, a TV repair friend suggested to use a 9V battery with small wires to test each light individually. They alternate in polarity, and are strung in series, so if you got this far, you can probably get through the testing for dead LED part. (don't look directly at the LEDs when testing. Trust me, they are wicked bright! Even looking away is not good. Use a hand or object to shield your eyes. You will know if they're on or not.) Once you determine which LED is dead, use thin wire and solder a jump across the dead one. It won't matter that the jumped LED isn't lit, there's like 20 per string, and you will never notice once the TV is back together. BE EXTRA CAREFUL IN PUTTING THE TV BACK TOGETHER.
(In my case, I had little trouble repairing (jumping) the LED, taking 1-2 hours to get to the soldering part. Unfortunately in the process of putting the TV back together, I carelessly managed to crack the LCD panel, thus rendering my 70" tv almost worthless, and wasting 2 hours of my day.)
Did I mention be careful with the LCD panel?
Also, probably use at least 2 people.
... AND BE CAREFUL."

[ecking767]

Re: Vizio E701i-A3

Sound, backlight, no picture. Replaced the Tcon and power board. After power board replaced, power led now stays on. Noticed when I removed board there were three mounting screws missing. Are these necessary for proper board grounding etc.? Still no picture. Noticed when 'input' or 'menu' button pressed, panel brightens a bit...any help?
Tcon board does NOT have any Z designation on it...think it has to be a particular board...?

Any way to verify panel is good?

its possible you have another bad T-CON board

[dick_barton]

Re: Vizio E701i-A3

Is your fault similar to :-
https://www.youtube.com/watch?v=cNFzBJELFoU

[freakaftr8]

Re: Vizio E701i-A3

Well I have been following this thread closely I also obtained this model TV. The symptoms are sound back light no picture. I found no 3.3 volt or 1.0 volt on the tcon board. It tries to come up upon start up but then dies off quickly. This is with or without the panel ribbon cables connected to the tcon board. So I found a supplier on eBay that says that he has a brand new t-con board never used and I purchased it put it in today without connecting the panel and I had no 1.0 or 3.3v still. And of course it does not provide an image. So my philosophy is a bad batch of t-con boards and I'm understanding the EEPROM on the t-con board is the culprit. I'm suspecting that this board probably had an issue and was removed from someone thinking it was a bad panel. There seems to be an awfully lot of these boards failing with this model TV. Of course the screen is made by sharp. I have had nothing but good luck with Sharp LCD panels so I highly doubt the panel is suspest.