Vizio M470NV will not turn on

[budm]

Re: Vizio M470NV will not turn on

I have never those before, if that is the case, then there must be another board inside the LCD panel since those connectors are not what we are seeing on the LED connectors.

[bjhunnicutt]

Re: Vizio M470NV will not turn on

Hmmmm, that could make things interesting then.

[budm]

Re: Vizio M470NV will not turn on

I sure like to know what it looks like inside the panel.

[CapLeaker]

Re: Vizio M470NV will not turn on

I sure like to know what it looks like inside the panel.

me too.

[bjhunnicutt]

Re: Vizio M470NV will not turn on

I will post pictures when I get to that stage. It will be a few days though.

[bjhunnicutt]

Re: Vizio M470NV will not turn on

One last question before I start trying to get at the LED strings.

If I can get the screen to flash on initially by jumpering PWR_on and BL_on, why wont the screen flash (with everything connected) when the power on button is pushed (manual or remote)?

[CapLeaker]

Re: Vizio M470NV will not turn on

maybe the mainboard isn't sending PSon and or BLon...

[bjhunnicutt]

Re: Vizio M470NV will not turn on

I didn't fully ask my question....

- We were going down the path that a bad led was causing the unit to shut off after the screen flashed on for a few seconds.

- If this were the (only) issue wouldn't the screen flash on briefly just by pushing the power button the same way it does when the power is "jumpered" on?

- Conversely, if the issue were (only) the mainboard not sending the proper signals to the power board, would the backlight not stay on when "jumpered" on?

Does, this mean that I have both a bad mainboard and a bad led string? Or I am doing something wrong.

I want to make sure before I start disassembling the unit further to get to the led strings. Which looking at the unit will be a dicey task, given my skill level.

Thanks again

[Electronic Handyman]

Re: Vizio M470NV will not turn on

That main board has two fuses on it , you'll notice them pretty easily bec their small at both of their metal ends are gold in colour.See if anyone of those two fuses are open or just check to see if any DC voltages are at both ends of each fuse.Their probably one 12v fuse and one 5v fuse.

[bjhunnicutt]

Re: Vizio M470NV will not turn on

the 12v and 5v fuse both are working and the proper voltage coming out. So I would like to restate my question from a few weeks ago.

- We were going down the path that a bad led was causing the unit to shut off after the screen flashed on for a few seconds.

- If this were the (only) issue wouldn't the screen flash on briefly just by pushing the power button the same way it does when the power is "jumpered" on?

- Conversely, if the issue were (only) the mainboard not sending the proper signals to the power board, would the backlight not stay on when "jumpered" on?

Does, this mean that I have both a bad mainboard and a bad led string? Or I am doing something wrong.

I want to make sure before I start disassembling the unit further to get to the led strings. Which looking at the unit will be a dicey task, given my skill level.

I am going to have to put off tearing it down to get to the leds for a while till things calm down around here.

Thanks again

[CapLeaker]

Re: Vizio M470NV will not turn on

Well... just take some measurements from the ribbon cable that goes from the power supply to the main board. Use pin out name with the DC voltages measured with TV on and TV off. Other than that it just makes my head spin reading all that. lol

[raduryea]

Re: Vizio M470NV will not turn on

I am having the same problem with my Vizio M470NV as bjhunnicutt did. It will not turn on, just has the Vizio logo on. I followed the instructions you gave through post 13 of this thread. When I measured the voltages on the power board all the 5V pins measured 5V but all the 12V pins only measured 9V. Any suggestions on what to do next?

[capwizard]

Re: Vizio M470NV will not turn on

" 12V pins only measured 9V" Tengo el mismo problema. Es porque el SoC IC no terminó el ciclo de auto-prueba. Para la protección, SoC IC es baja abajo 12v a 9v.

[dskall]

Re: Vizio M470NV will not turn on

Sorry my reply was 3 pages late

[capwizard]

Re: Vizio M470NV will not turn on

" 12V pins only measured 9V" I found out was the TV in shutdown mode because I've had twins TV to monkey around with.

Primero, pensé was power supply or LED, Después I used poormans LED tester and another Good power supply to isolate the problems, Me entero, el problema es main PCB.

PS: I hope you can understand that I am learning Spanish.

[Mzam220]

Re: Vizio M470NV will not turn on

I have the same problem on the same tv i chacked all the caps they were good and voltages were good orher than the 145 was at 115 i reseated all the connections and nothing happened the orange logo still stays orange all the fuses and microfuses are good what sould i do?