Vizio E470I-A0 Power led comes on then slowly goes off

[Gadjet]

I recently ordered a complete repair kit for this tv through shopjimmy.com it came with both the power supply and main board with all of the connects such as the control panel, ir board, and wifi board. but to no avail there is no change when i hit the power button you can see the power light come on and slowly fade out. No picture or sound. Has anyone had a similar issue?

[Gadjet]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Ok I tested the voltage of both the power supplies before pressing the power button and after. this was the results.

Off
5.28
5.28
0
0
0
0
0
0
0
1.03
1.030

After power
5.27
5.27
0
0
0
11.90
11.90
3.21
3.19
3.30
3.30
0

Shop Jimmy power supply:
Off
5.24
5.24
0
0
0
0
0
0
0
1.02
1.020

After power
5.23
5.23
0
0
0
12.01
12.01
3.21
3.20
3.30
3.30
0

[SLK001]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

That's the way this TV operates the "ON" light. It powers on, then slowly fades off. It does this even with a perfect TV. What do all your numbers mean? Do you think we are psychic and can tell what you mean?

My 55" Vizio also operates the "ON" light the same way.

Do a flashlight test. You probably have a screen with info on it. Your problem is a bad LED (or two, or three, or four, or...) in the backlight. If the flashlight test is successful, then crack open the panel and replace the bad LEDs.

[SLK001]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Oh, by the way, all your voltages are within specs. The model power supply that you have does NOT flag a fault with dead LEDs for some reason. This is why the flashlight test will confirm a working TV, minus the backlights.

Sorry, but you spent all that lucre on all the wrong parts. Four or five (or even less) $0.25 parts will end up fixing your set. Well, at least you now have spares!

P.S. I just last week fixed an E470i-A0 with the same problem.

[Shane711]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I just got done working on a Vizio E470I-A0. I can tell you exactly why the Power led comes on then slowly goes off. It is caused by bad LEDs in the screen. Don't bother replacing any boards because you need to take the panel apart and replace the LEDs. In my TV there are a lot of them burnt out on every strip. They normally burn out because someone has turn the light up to high. I recommend never higher than 75%. Same thing happens when someone turns the volume up too high, they burn out the audio amp.

So I replace my LEDs with a heat gun. Soldering iron will NOT work.

As you can see from my picture I am testing 1 strip and 2 of the LEDs are burnt out. I will not be fixing this TV because the screen is cracked but when the TV will not turn on I have to find out why. Now I know my parts are good.

So to everyone that has this problem, check for burnt out LEDs.

[SLK001]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I can tell you exactly why the Power led comes on then slowly goes off. It is caused by bad LEDs in the screen.

Good LEDs or bad LEDs, this is the way the power indicator LED works. Depending on the power supply version, the TV may work with the backlights out. A "flashlight test" that shows info on the screen will indicate a problem with the backlights.

[Shane711]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

OK, well I guess I should have said if your TV will not turn on then first test your panel LEDs before buying parts.

[SLK001]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

There is a power supply board that this TV uses that WILL shut the TV down with bad backlights. The first E470i that I repaired had that power supply and would not turn on. The second E470i that I repaired had the power supply shown by the OP in the first post. That power supply does NOT flag a shutdown with bad LEDs in the backlight. The flashlight test showed a screen full of broadcast television with sound. Though I really don't like having to tear down a set to the backlights (the panel is very fragile standing naked in the open), these repairs are really the easiest to do.

[Jimmy60]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Hello All;
I just replaced the full set of led strips in one of these being very careful with the screen disassembly and reassembly. I was not able to verify anything on this set except that voltage was being supplied to the backlights and they were not coming on. Feeling confident that this would be the only problem I proceeded with the replacement of the LEDs. Gonna attach a pic of what I have now and ask you what you think?

[Shane711]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Bad Panel. Not worth fixing. Save parts for the next TV.
But you could try the trick with the rubber hose pressing on the tab bond of the screen. Budm has a post describing how to do this.

check out this video https://www.youtube.com/watch?v=OF574m55F5M

[martino]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Sorry Jimmy,but that panel is damaged,either by handling the screen too rough or it was a pre existing fault.
You can try and inspect/manipulate the ribbon v]cable that lines up with the fault but am almost 100% sure it's a goner.
Take it as a lesson learned and move on to the next.

[x_orange90_x]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I apologize for resurrecting an old thread, but my situation is too similar to the OPs to not post for comparative reasons.

I have the same set as the OP, but my situation differs slightly. When I turn the power on my indicator light is very dim and starts to fade along with my screen flashing every few seconds. The screen is extremely dim and can only be seen in a very dark room. It will flash on and I can see the big V logo, then goes off, back on and I see the No Input message and menus etc, back off.. And this cycle repeats indefinitely. When the screen flashes on and goes back off, the power light will start to dim at the same time in unison with the screen flashes.

I know the OP had bad backlights, however I'm not certain yet that I do. I don't actually NEED a flashlight to see the screen when it flashes on, I just need the room to be dark. Maybe that means something, maybe not.

Anyway, I made my own thread, but as I mentioned, there's enough good info here that makes for a good comparison.
https://www.badcaps.net/forum/showth...672#post763672


Any thoughts?

[attainteddragon]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

if you are only getting the v splash screen over and over, you are probably looking at a faulty eeprom.

[x_orange90_x]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

if you are only getting the v splash screen over and over, you are probably looking at a faulty eeprom.

It gets past the splash screen just fine. I can see the menus, but only in a dark room and the screen flashes on and off every few seconds.

[dskall]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

Probably bad led's

[x_orange90_x]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I've got a 50" RCA with bad leds that I haven't bothered with. Is this Vizio an easier one to replace them on? Obviously it's more worth it because it's a smart tv. I bought a couple suction cups from Menards a while back when I thought I might attempt the other tv, so I do have those handy.

[Shane711]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

In my opinion ALL smart TVs are worthless, the reason being is you can by an Android box and it makes any TV a smart TV and it becomes way more then any smart TV on the market. Most smart TVs you can not install and delete apps but on the android box you can. I have realized that if you buy an android box it is best to get one with 3GB ram and no less. You can even connect these to the old tube TVs and they become a smart TV.

I fix a lot of TVs with bad LEDs, it does take time but it feels good when the job is done. I use a heat gun to remove the LED and replace it with one I took from a broken screen or you can replace the whole strip.

[x_orange90_x]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

In my opinion ALL smart TVs are worthless, the reason being is you can by an Android box and it makes any TV a smart TV and it becomes way more then any smart TV on the market. Most smart TVs you can not install and delete apps but on the android box you can. I have realized that if you buy an android box it is best to get one with 3GB ram and no less. You can even connect these to the old tube TVs and they become a smart TV.

I fix a lot of TVs with bad LEDs, it does take time but it feels good when the job is done. I use a heat gun to remove the LED and replace it with one I took from a broken screen or you can replace the whole strip.

I may end up having to replace the leds individually because I can't find the strips for this tv. ShopJimmy is sold out and the ones on eBay aren't complete sets or are used. I would really rather replace all sry once because I don't want to be tearing it apart again in 2 weeks because some of the ones I didn't replace had stopped working.

This is considering the problem actually is bad leds. I have not even taken the back off yet. I'm probably unlucky enough to have gotten the model power supply that makes it more difficult to diagnose burned out leds. I read earlier that there's two model power supplies, one that throws a fault and shuts the tv off in the event of burned out leds, and the other supposedly doesn't thus the tv will stay on but without backlights.

[Shane711]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I think using old LEDs is OK, they are suppose to last very long. I have some TVs running 2 years all ready on old LEDs. I may have some strips I will be listing on eBay soon.

[x_orange90_x]

Re: Vizio E470I-A0 Power led comes on then slowly goes off

I just checked the voltages. Both strings spike up to ~130v and stay there. So, I guess there's bad leds in both strings.