vizio stuck on logo model m470nv

[Djones]

Hey I am trying to fix my tv but Im stuck at this point. The tv turns on, gets stuck on the logo screen for about 90 seconds turns off and continues to loop. Sometimes the vizio light blinks other times it doesn't. I've read a few things on the forum w this problem but it seems it can be a number of things and i don't know a great deal about this tv.

[Djones]

Re: vizio stuck on logo model m470nv

Pictures.

[ecking767]

Re: vizio stuck on logo model m470nv

this is a common problem with Vizio, the eeprom information on your mainboard is corrupt.

[tom66]

Re: vizio stuck on logo model m470nv

It could be a T-con issue; freezing on the first frame. Someone had a similar issue with a Westinghouse here.

Try unplugging the T-con cable with the set running, then press the INPUT or MENU button, and plug it in again; if the unit shows a single new frame it could be the T-con.

[Djones]

Re: vizio stuck on logo model m470nv

I thought it was the main board but I didn't want to go buy a new one and not be somewhat sure. Ill let you know how the T-con things goes. Thanks for the replies.


T-Con note:

If I did that right(very well could of messed up) the logo disappeared but the unit stayed on a black screen. No changes w pressing the menu or input button.

[Djones]

Re: vizio stuck on logo model m470nv

Is there anything else I can do to trouble shoot the unit, to make sure it is the main board that needs replacing? I keep reading and I'm seeing that a lot of it is the main board but I'm also seeing that there can be other problems as well in other areas. I don't really have a clue as to what I'm doing so if there is a thread that I'm just not finding on how to start testing it or what tools I need to do so can someone please direct me to the page. Thanks

[loco1234]

Re: vizio stuck on logo model m470nv

Did you fix the issue, I have the same issue with my m420nv,

[ecking767]

Re: vizio stuck on logo model m470nv

Did you fix the issue, I have the same issue with my m420nv,

If your LCD TV is stuck on the Vizio logo then your main board eeprom is bad, if you know how to solder then you can replace the eeprom chip on your mainboard.

[pwhite]

Re: vizio stuck on logo model m470nv

Having the same problem with a M470NV in my shop. I have changed the main board and have the same situation...the picture freezes every five seconds or so and the sound is not interrupted.

[SlickClick]

Re: vizio stuck on logo model m470nv

I believe these newer LED backlight type unit only have a Mainboard and a backlight driver inverter board in them... the T-con, audio, video, is all built into one board now... I was reading about eeprom issues too...

I got a JVC LED LCD that works fine for a couple hours then screen starts to glitch and bug out... gonna get a can of air and go freeze happy and see what i can narrow down...

[tom66]

Re: vizio stuck on logo model m470nv

This one still has a T-con, but yes, for many newer TVs, the T-con is gone, it is on the LCD panel driver board. Fault there, panel is often toast. Yay, progress.

[CoppellTVRepair]

Re: vizio stuck on logo model m470nv

We've seen that happen due to bad EEPROM/firmware IC as well as because of a shorted HDMI multiplexor.

Both are available online for DIY repair , but both carry the risk of NOT being the source for the shutdown in your particular case. Although less likely, the main processor could also be bad, for example, as it is fairly complex and it may be able to start and execute the firmware all right, but a section of it handling the HDMI or LED driver control could fail to initialie/communicate with the core at a later initialization stage. (hardly the T-CON driver if you already have the vizio logo on the screen, but it illustrates the point)


Hope this helps.