Vizio E470i-A0 led replacement issue

[splatee]

Hello,

I picked up a Vizio A470i-A0 that was told has a power on issue. After taking a look at it turned out to be a LED backlight problem because it had sound and picture using the flashlight test. So I took the screen off and removed each of the round plastic diffusers that sit over the leds in order to test them. I found 3 that were out. So I soldered on 3 good ones from an extra led strip that I had. I went ahead and put the round diffusers back on and now have picture but it has sort of a spot light effect to it. I wonder if this is due to the led light diffusers that sit over the leds?

[attainteddragon]

Re: Vizio E470i-A0 led replacement issue

the diffusers need to be sitting perfectly flush to the strip and in the same orientation as when they were removed.

[splatee]

Re: Vizio E470i-A0 led replacement issue

the diffusers need to be sitting perfectly flush to the strip and in the same orientation as when they were removed.

Ok, well I will have to take it all apart again. I wish I knew that before I took them off or I would have marked them. I will see if I can get it done tomorrow. Also could I leave them off?

Thank you

[splatee]

Re: Vizio E470i-A0 led replacement issue

Ok went and took screen off again and powered it on. Looks like I have 3 rows of leds out in the middles section and 3 rows that work. Testing voltages I have 104v and 20v. The other bank reads 125v and 2.2v. I tested each led again individually on the strips that do not light and they all lit. So is this a power supply issue or could it be the board that all the leds plug into?

[dick_barton]

Re: Vizio E470i-A0 led replacement issue

There a possibility that there's a poor connection at the end of one or all of the 3 led strips that do not power up. Use your meter to check for continuity on ohms with set off. If there is a continuity problem then use a small piece of wire and solder the led strips to the connecting (T) strip.

[splatee]

Re: Vizio E470i-A0 led replacement issue

Found out what the problem was. It was one of the new leds I soldered on. It was a poor solder connection. All LED strips now work. Right now I am painstankeling adjusting each individual led diffuser cover lens.

Thank you

[splatee]

Re: Vizio E470i-A0 led replacement issue

Wow this is starting to be a real pain putting these led diffusers covers back on. I just can not get them right. I have maybe 12 or so left that just do not want to work right. I went as far as lining sheets of white paper in between the screens and it helped take away the spots but i could see where the edges of the paper were.

I also have led strips from a sharp aquos tv that i salvaged. I am thinking about swapping all the strips out with them.

[attainteddragon]

Re: Vizio E470i-A0 led replacement issue

highly unlikely that those led strips will work unless they are the same model.

another thing to pay attention to when replacing led's is making sure that you secure the strips back down with double sided tape, as if they are slightly warped, they will throw the light around unevenly as well.

[splatee]

Re: Vizio E470i-A0 led replacement issue

Update time

Went ahead and redid all the led plastic covers. Took me about an hour to do but it was worth it. The picture looks great and there is no noticeable spotlighting.

Thank you everyone for the help.

[budm]

Re: Vizio E470i-A0 led replacement issue

So what kind of glue did you use to put the diffuser LENS back on?

[splatee]

Re: Vizio E470i-A0 led replacement issue

So what kind of glue did you use to put the diffuser LENS back on?

I used a hot glue gun. Worked good. I was a bit worried that the heat may soften the glue but it has been holding.