Vizio M470NV - Blinking logo

[AndrewBuchinger]

So my TV died and I refuse to buy a new one after only one year and 2 months. It either just blinks the logo a few times white/orange and stays off, or sometimes after a long hard time unplugged, it will make it all the way to turning the backlights on and then sitting like that for a minute, then turning them off and blinking the logo a few times. Power on tests after this just blink the logo with no backlight response.

I am going to work through this and I hope you guys can help. Does anyone have the readings I should get off of each area of the System and Power boards?

If anyone has any ideas where to start I am all ears. I already did a quick visual inspection and none of the caps "appear" bad. My multimeter is not a cap tester and I wil probably just buy a recertified board for now if it is identified as bad. I plan on getting a cap tester in the near future though and I will repair the original board that is bad (if it doesn't end up being EEPROM or something)

[gilly1984]

Re: Vizio M470NV - Blinking logo

Now by "LOGO" do you mean standby light? As if it lights up the logo on the tv?

And not the logo is showing on the screen?

You have hopefully read a few things on this site so know that even if a cap looks good it could still be bad.

[budm]

Re: Vizio M470NV - Blinking logo

Post good clear pictures so we can see how all the boards are connected together, and also the pictures of each board. Power supply board will be the first one we want to check, so if the connectors on the board has any labels on them, then take those pictures so we can tell you which pin to test. Just remember that we do not have the boards in front of us to look at, so good pictures are a must. Please use GO ADVANCED to upload the pictures.
We see a lot of bad EEPROM in new Vizio lately in this forum.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

I mean the standby light, not the logo on the screen. The most the screen ever gets to is backlights on and black, It then turns the backlights off after a minute and then blinks the standby/logo and that is only SOMETIMES after I unplug it and let it sit for awhile. Otherwise it just blinks the standby light I think 5 or 6 times and nothing happens.

Also I know that caps can still be bad even if they have no visual defects. I just did a quick look to check.

I looked at the users manual online and was wondering if anyone had the POWERUSERS manual. one that has boards specs and expected voltages.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

Wow guys thanks for the quick responses. I promise to be as kind to other new people once I get better at this stuff.

If you guys need any help in the PC/Networking area let me know. I am a network engineer and I have worked quite a bit in the sysadmin area.

I am currently at work and I will be going home for lunch/dinner to take pictures of everything. I will post them when I get back to work.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

So I attempted to take some photos with my phone but I am not even going to bother posting them. They look like my son drew them with crayons. (I get the free phone every year) I am going to upload pictures from online that are of the same boards and I went over them with a fine tooth comb to make sure they match what I have.

[gilly1984]

Re: Vizio M470NV - Blinking logo

The guys here may spot something on your boards that may be the problem so please try and get a pic up of yours.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

HEre are the pictures of the boards. The 12V/5v Combo head to the mainboard.

The bottom 5v connector heads to the daughter card.

The 2 blue connectors head into the actual screen.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

The guys here may spot something on your boards that may be the problem so please try and get a pic up of yours.

I will when I get ahold of someone with an I-Phone or droid or w/e has a good camera. You can barely tell where the capacitors are with my phone's photo. I don't even want to pay the data charges to send it to my email.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

Wow so I just noticed the voltag parameters are right there on the card. 12V for the 12V rails, 5.1 for those, and 145.2 headed fro the LCD/LED section right?

So the next question is which ones should be on when?

[budm]

Re: Vizio M470NV - Blinking logo

At the bottom right of the board where the white connectors are, I cannot see the text clearly and some of them are blocked by the @2009 printing on the pictures.
Can you tell me what the labels are? I am looking for PS_ON, BL_ON or something like that. Right now your standby 5v power supply is working, the 12v should come on when you turn on the TV.

[budm]

Re: Vizio M470NV - Blinking logo

You may want to read this thread also:
https://www.badcaps.net/forum/showthread.php?t=19829

http://reviews.costco.com/2070/11534...ws/reviews.htm

This model does not look good as far as reliability.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

At the bottom right of the board where the white connectors are, I cannot see the text clearly and some of them are blocked by the @2009 printing on the pictures.
Can you tell me what the labels are? I am looking for PS_ON, BL_ON or something like that. Right now your standby 5v power supply is working, the 12v should come on when you turn on the TV.

Does it matter which ground on the cable set I test voltages against?

Also on the reliability note, the OS out of box was broken, and they would push hotfixes for vulnerabilities without notice to you, so the TV would just shut off and patch itself without warning sometimes. It did fine the last 7 months. then it started refusing to turn on randomly with the same symptoms stated above. After a few tries it would start and thenbe fine for awhile. It would also shut off randomly.

[Mr Bill]

Re: Vizio M470NV - Blinking logo

My 55" vizio will do the same thing after the power flickers during a thunderstorm. Unplug the daughter card and see if the tv will turn on without the flashing logo you won"t have any picture when you do this.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

with the daughter card unplugged TV flashes the same.

Also the text covered by the 2009 logo is

PWM

NC
BL_ON

Power
_ON

They are the top pins indicated on the cable
I assume the power on is the power on impulse switch from the mainboard to the supply?

[budm]

Re: Vizio M470NV - Blinking logo

OK, POWER ON (ON = >3VDC) is the signal from the main board to turn on the PFC Voltage booster circuit, BL_ON (ON = >3VDC) will turn on the LED backlights on, you should see 145V at the connectors (Blue) which feed the LED strings.
PWM is for backlights Dimming.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

I get 3.3 long pulse from the board and then it supplies 12.35 volts on all three 12v lines to the motherboard. After about 15 seconds the board decides that something is wrong and I get the pulse again and power shuts off. I will check the LCD voltages now.

[budm]

Re: Vizio M470NV - Blinking logo

You should see the BL_ON goes high also.
Also try removing the two cables (from LED ) from the two blues connectors and see if it still goes into shutdown.

[AndrewBuchinger]

Re: Vizio M470NV - Blinking logo

Didn't check it but the backlights came on so I assume it did it's job. I will check it when I check the LCD

[budm]

Re: Vizio M470NV - Blinking logo

So we will have to find out what causes an error to make the TV goes into shutdown. I hope you are not having EEPROM problem, it is hard to find out if it is firmware or hardware.