Vizio VO37L power problem

[ronm6962]

Re: Vizio VO37L power problem

Thanks. I previously ordered a new board...just in case I couldn't fix this one, and it arrived today! Put it in and the Vizio light turned white with the power on button, then the screen lit up, but I get no reaction from the Menu or Input buttons....nothing on the screen...just a light blue background. Do I have to have an input device connected to get anything on the screen?

[budm]

Re: Vizio VO37L power problem

Did you verify that the LVDS cable between the main board and the T-CON board is seated properly?

[ronm6962]

Re: Vizio VO37L power problem

TCON Board....is that the board with all the control buttons on the side of the unit? I have not removed that board, but will check it.

[budm]

Re: Vizio VO37L power problem

It is the board under the metal shield top center.

[ronm6962]

Re: Vizio VO37L power problem

OH...OK....I thought that was called the Power Supply Bpard. Anyway, I reseated all the cables on it, but still do not get anything on the screen except the backlight.

[budm]

Re: Vizio VO37L power problem

But you did get the picture before when you jump U22, right? if that is the case, something is not right either with the new board.

[ronm6962]

Re: Vizio VO37L power problem

No, I have never gotten anything on the screen until I replaced the Main Board. I now get the Vizio light turning white and a backlit screen, but no video yet. Does that indicate another problem with the Main Board?

[ronm6962]

Re: Vizio VO37L power problem

OK, here are the new voltage checks with the replaced Main Board, and with the power on (white Vizio light and grey-blue lighted screen)...does this tell us anything???

all measurements taken from the IC pins left to right
U15 - 2.0, 3.3, 5.0
U16 - 12.0, 0, 4.9
U17 - 2.0, 3.3, 5.0
U19 - 1.2, 2.5, 5.0
U20 - .5, 1.8, 3.2
U21 - 0, 1.2, 2.5
U22 - 2.0, 3.3, 5.0
U44 - 8.2, 9.5, 12.0

[budm]

Re: Vizio VO37L power problem

Sorry, I got your TV mixed up with another VIZIO I am helping out on another thread.

[budm]

Re: Vizio VO37L power problem

OK, here are the new voltage checks with the replaced Main Board, and with the power on (white Vizio light and grey-blue lighted screen)...does this tell us anything???

all measurements taken from the IC pins left to right
U15 - 2.0, 3.3, 5.0
U16 - 12.0, 0, 4.9
U17 - 2.0, 3.3, 5.0
U19 - 1.2, 2.5, 5.0
U20 - .5, 1.8, 3.2
U21 - 0, 1.2, 2.5
U22 - 2.0, 3.3, 5.0
U44 - 8.2, 9.5, 12.0

They are correct Voltages.

[budm]

Re: Vizio VO37L power problem

OK, there is SMD fuse on the T-CON board that we need to check the DC Voltage at both ends of the fuse with ref to chassis GND when TV is ON.
And BTW, did anyone else work on this TV before or it just died by itself?

[ronm6962]

Re: Vizio VO37L power problem

U21 shows no input voltage...could this be a source of the problem?

[ronm6962]

Re: Vizio VO37L power problem

OK, where is this SMD fuse on the T-Con board (same as Power Supply Board?). The only fuse I see is the 250v ceramic fuse next to the AC input, and it shows 119.2v AC at both ends.

[ronm6962]

Re: Vizio VO37L power problem

Oh, forgot to answer your other question....to my knowledge no one has worked on this TV until now.

[ronm6962]

Re: Vizio VO37L power problem

It was working one day and not the next.

[ronm6962]

Re: Vizio VO37L power problem

OK, I found the T-Con board (duh!!) and reseated the cables, no change. I do not see a fuse on the board, however everything is very tiny, so maybe I'm missing it. Can you give me a device number or a location?

[ronm6962]

Re: Vizio VO37L power problem

I found a fuse on the T-Con board, I think. It is labeled F1 and measures 11.99v on both ends with the TV powered up. This what we are looking for??

[ronm6962]

Re: Vizio VO37L power problem

We are much closer to a working TV than when we started, so hoping you can guide me to the solution. Will check back tomorrow morning for next steps. Thanks.

[budm]

Re: Vizio VO37L power problem

OK, so the T-CON is getting the power OK but no pictures, it can be either the main board is not sending the signal to the T-CON or the T-CON is dead.

[ronm6962]

Re: Vizio VO37L power problem

OK, that makes sense. Is there any way to isolate the problem between the Main Board and the T-Con board? I purchased the replacement Main Board on Ebay and it was said to be tested and working 100%. It does more than my old main Board, as it wouldn't even turn on the backlights. Any suggestions on isolating potential issues on the T-Con board?