Vizio M550NV - Flashing Logo Stuck at Startup Screen

[gideon277]

Okay folks I know there have been a few on this t.v before and believe me I have read them. I have already inspected caps and there do not seem to be any bulging at all. Here is what happens. I plug the television in the logo does the white / orange flash for an extended period of time. Then I am able to power the tv on and I get the Vizio startup screen (Non-responsive) to anything and then it powers itself down and backon again in an endless loop unless I unplug. Of course here are the pictures.

[selldoor]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Were there no tests mentioned in the other threads that you could do.
Vizio unresponsive is likely to be voltage regulators and/or eeprom?

[gideon277]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I did do plenty of testes from reading the other threads and I am leaning toward the eeprom. However I like to touch bases because you know maybe we become too focused on a the problem and we don't see the solution.

[gideon277]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Plus I have to ask which location for the EEPROM on this board?

[ecking767]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Plus I have to ask which location for the EEPROM on this board?

under the metal shield, TSOP48 memory chip, smart TV.

[gideon277]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Thank you and through some testing I have come back to the power supply with a few issues. I think there may be more than one failure on this television possible voltage regulators so until I get the time to chase all of that down. I guess I am in a holding pattern.

[dsvictory83]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I'm having the same issue. I was doing some electrical work, kept turning breaker on and off with tv plugged into the wall. Didn't even think about the TV. Now, the TV, when the power button is pressed, the V logo comes up on screen at startup during this time, the logo at bottom off the screen flashes white then orange and so forth for about a minute. The TV then shuts down, reboots and loads the V logo comes up again. Then, a minute later, shuts down, flashes orange and white and keeps on repeating itself. Help please????

[ecking767]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

replace the main board, EEPROM is most like the problem but its a smart TV. So the it need to be reprogram by Vizio.

[gideon277]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I ended up replacing the power supply but it did not resolve the issue. No change in the problem now I wonder did I purchase an equally defective power supply or could it in fact be the mainboard. This has been the most stubborn tv to day as just about everything checks fine on the thing. grrr.

[budm]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

From what you described in post 1, it does sound like main board problem.
You can contact shopjimmy to see what they say, they have very helpful services.

[gideon277]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I replaced the mainboard and yes that fixed the problem. I did however swap old power supply back in and the tv stopped working so apparently something was wrong with both boards. Power Surge perhaps?

[ecking767]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Depend, does it have power at all? like +5volts? In most cases a power surge take out the fuse and other components

[e-lectronicsrepair]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

test

[budm]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

Thanks for the repair follow-up.

[ecking767]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I came across a Vizio M550NV that was stuck on the "Vizio logo" when powering on. I remove the metal shield to access the flash memory chip. I wanted to re-solder the flash memory chips to see of any changes, but there was none.

I purchase a working replacement main board for the M550NV. So I removed the flash memory chip from the working board and place it on the non working main board to confirm the problem and the memory chip was the problem and the TV power up fine.

So I copy the working flash memory with my programmer and copy to new memory chip.

The copy flash memory chip works on the fail board, no more stuck on logo. All apps are working and the TV is functioning great !!!

[budm]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

May be you should offer that service for other people, that will sure help out lots of people.

[ecking767]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I mostly likely will sale this nand flash memory chip fix to other on my website, and also offer those who can't solder to send their main-board in for this fix.

I just accomplish this and I like to make sure there isn't any bug or future failure, I doing to burn in test for couple of days for insurance.

[jongrafto]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I mostly likely will sale this nand flash memory chip fix to other on my website, and also offer those who can't solder to send their main-board in for this fix.

I just accomplish this and I like to make sure there isn't any bug or future failure, I doing to burn in test for couple of days for insurance.

I have a similar problem with my Vizio M550NV.

TV went out but backlight is still on. No Vizio logo at startup though. Replaced T-Con board. No luck. Now I think it is the main board that is the issue.

Any recommendations on what to fix/replace? Don't really want to plug another $150-$200 on this.

[paulkz28]

Re: Vizio M550NV - Flashing Logo Stuck at Startup Screen

I too have now replaced the TCON board and the main board. I just purchased the power supply board- if this doesn't work then I'm SOL.