Vizio E701i-a3 Backlight issue

[michaelart]

Thanks for looking. I have a Vizio E701i-a3 tv that when turned on the backlight comes on for a second or so and then turns off. I do get an image when shining a flashlight on the screen (the message says RGB signal not detected, TV will power off). Another note, the backlight goes out while the Vizio logo is present after TV power on. I have replaced the power supply board with the same result.

This TV has three pairs of wires that power the LEDs. Since I do not have a wiring diagram, the only thing I could do is to remove each pair, one at a time. I still got the same result, no backlight.

Is there any possibility that the mainboard may be the culprit?
Any other ideas?

Thanks again,
Michael.

[Andrew F. Ali]

Re: Vizio E701i-a3 Backlight issue

It could be a Backlight issue as the LED Driver will shut down with an open LED or if you disconnect a string of LEDs.

[CapLeaker]

Re: Vizio E701i-a3 Backlight issue

x2 on a bad LED.

[michaelart]

Re: Vizio E701i-a3 Backlight issue

I was afraid that might be the case.......just hoping that it could be something else.....makes me a bit nervous taking a panel apart. Like a bull in a china shop.....lol. Thanks guys, appreciate the input.

[michaelart]

Re: Vizio E701i-a3 Backlight issue

I purchased replacement led strips (all 3) and they tested good when I hooked them up. I am a bit nervous about disassembling such a large panel assembly. Has anyone done this or have access to the instructions on how to properly disassemble and replace. This is one time that I would prefer some instructions than figuring out being that it is such a large panel. Thanks again for your input.

[budwich]

Re: Vizio E701i-a3 Backlight issue

not to take you back a bit too far.... but did you try disconnecting the tcon cables (one side or the other) and see what happens?

[michaelart]

Re: Vizio E701i-a3 Backlight issue

I plugged in the replacement LEDs in the place of the original ones and they light up and stay lit unlike the original which would seem to prove that one of the LED strips in the TV is faulty. Just not looking forward to disassembling the panel.

[CapLeaker]

Re: Vizio E701i-a3 Backlight issue

good luck and let us know how you progressed.

[bruce@2305]

Re: Vizio E701i-a3 Backlight issue

I have the same issue in Samsung HD led TV . I'm fresh to led tvs .led turn off and on automatically when I increased the backlight. But reduced backlight screen working fine please help me

[vinceroger69]

Re: Vizio E701i-a3 Backlight issue

I have the same issue in Samsung HD led TV . I'm fresh to led tvs .led turn off and on automatically when I increased the backlight. But reduced backlight screen working fine please help me

Please can you make a new thread as this is a totally diffrent tv in your new thread please post clear pictures of the diffrent boards used in your tv and one showing them all connected together and please let us know the full model number of the tv thanks.