Vizio M651d-A2R won’t turn on

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

The only voltage I am getting at vled is the 24v coming from power board. The 2 cables from the power board go to those connectors on the led driver board. I was able to get it to come on and work by holding power button down but that's not working now.

[budm]

Re: Vizio M651d-A2R won't turn on

So the CN5 of the LED driver board goes to the T-CON board, correct?
You will get only 24V if the Boost converter circuit does not get the BL-ON signal.

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

If we are talking about the plug with all red wires it does go to t-con. Thanks Michael

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

Does the BL signal come from the main board or is there some more troubleshooting I can do?

[budm]

Re: Vizio M651d-A2R won't turn on

So what Voltages do you have now at the power board connector that goes to the main board?

[budm]

Re: Vizio M651d-A2R won't turn on

https://www.badcaps.net/forum/attach...2&d=1574302261

and https://www.badcaps.net/forum/attach...0&d=1574733323

I am still confused about CN202 pinout for BL-ON/OFF, you have pin 11 and 12 as BL-ON.
https://assets.shopjimmy.com/media/c...00.061-top.jpg

Pin 12 is the only BL-ON pin, so what do you have on pin 12 when you turn on the TV?

[nomoresonys]

Re: Vizio M651d-A2R won't turn on

11 is not labeled. 12 is bl_on/off. SEE 11 there's no line there.

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

I can check tonight, would inserting 3v on that pin fry something?

[nomoresonys]

Re: Vizio M651d-A2R won't turn on

I don't think I would insert anything on 11 at least not til you know what 11 is.

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

So still no startup but with it plugged in 11 is .865 and 13 is .165. Here is the pin out on the led driver. Which shows pins 11 and 12. The processor is hot to touch were you can't leave your finger on it.

[budwich]

Re: Vizio M651d-A2R won't turn on

Hornnumb2... you need to "re-read" / check the tables that you posted for CN202 and CN101 on the main board... something isn't right.... that is some of what the "confusion" is I think. First, the cn101 has 15 pins but you only list 12. CN202 has 14 pins on only one at pin 12 for BL-ON.... at least from the shopjimmy card. Is there some card difference here? In the post above mine, you are referring the "led driver board" but I think most are asking / talking about the main board. Further, one of the pins on cn101 is "important"... lamp-error

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

Ok let’s try this again. First is labeled then voltage.

CN101
1) 5VSB. 5.12
2) 5VSB. 5.12
3) AC off det 3.31
4) PS On 3.13
5) GND. 0
6) GND. 0
7) NC
8) NC
9) GND 0
10) GND 0
11) Reg 12v 11.91
12) Reg 12v. 11.91
13)BL On/Off .837
14) Dimming .165
15) Lamp Err 3.27

CN202
1) 24v 24.45
2) 24v. 24.45
3) 24. 24.45
4) 24v. 24.45
5) 24v 24.45
6) GND 0
7) GND 0
8) GND 0
9) GND 0
10) GND 0
11) Lamp Err 3.27
12) BL on/off .837
13) NC
14) Dimming .165

[R_J]

Re: Vizio M651d-A2R won't turn on

If you look at the Led driver board, CN5, you will see it requires BL_CLK, BL_DATA, BL_YDIO, PWM etc. signals from the main board, You need a scope to see if you have those signals. This is not a simple turn the backlight on and off tv

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

Would a cheap scope on eBay work for this, does it need to be a certain MHz?

[R_J]

Re: Vizio M651d-A2R won't turn on

In your first post you said

I can get it to turn on holding down power button for 30 seconds,

Did you get a picture on the screen? did you have backlights? so why don't you use that method to turn on the tv and check the voltages going to each led string on CN3 and CN4?

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

I was able to hold power button down and get backlight and menus, but that has quit working now.

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

Also sometimes when I plug it in the led light with light white but then fade away

[Hornnumb2]

Re: Vizio M651d-A2R won't turn on

Ok been out there messing with it some more. When I plug it in and get the white ir to come on and fade out. It will start up. Then I get these voltages.
CN101
13) 3.29 instead of .837
14) 2.71 instead of .165
15) .157 instead of 3.27
Those translate over to the CN202 also. I get 62.5 on VLED when working.

[budm]

Re: Vizio M651d-A2R won't turn on

At this point it looks to be something going on with the main board.

[nomoresonys]

Re: Vizio M651d-A2R won't turn on

Disconnect the tvs power cord from the power outlet and leave it unplugged. Then press and hold the power button on the TV for 20 seconds.

After you have held the button for 20 seconds, let go then try to power the TV on.