Vizio vx37l hdtv10a

[sbeck]

I have this TV that has had the main board replaced, after the main board was replaced the tv worked well for almost a whole movie, then I started getting green shading on the darker areas of the screen. It was suggested I replace the LVDS Cable, I did that and it had no effect. Then it sat all weekend and now when I turn it on the screen comes up all white, then starts changing colors

White
Black
Red
Green
Blue

Repeats until I press the power button Any thoughts are apreciated

[johnboy1313]

Re: Vizio vx37l hdtv10a

Maybe refer to this post.

https://www.badcaps.net/forum/showthread.php?t=24809

[sbeck]

Re: Vizio vx37l hdtv10a

Thanks,
I was going to try that, however I have no control or options, I con't even get to the menu or change the input/channel.

The tv comes on, no logo, and starts cycling colors as indicated above

[johnboy1313]

Re: Vizio vx37l hdtv10a

Have you tried leaving it unplugged for a while?

[sbeck]

Re: Vizio vx37l hdtv10a

This all happened about 4 months ago, and I got it out of the way, and I just got it back out. So it has been unplugged for quite some time.

[MisterD]

Re: Vizio vx37l hdtv10a

Please post some pictures.

[sbeck]

Re: Vizio vx37l hdtv10a

Her are the pictures

[martyparish]

Re: Vizio vx37l hdtv10a

Have you tested all of the voltages coming out of the PSU? Take a close look under that heat sink and see if any caps are bloated.

I have a very similar TV to this and mine had power AND main board problems. I still havent' replaced the main so it remains leaning against the wall

[budm]

Re: Vizio vx37l hdtv10a

Start by cheking the power supply voltages and the IC regulators on the main board by reding the link below my signature..

[sbeck]

Re: Vizio vx37l hdtv10a

All the Caps are physically ok on the power supply, also the voltages are:

3.19
5.27
12.22

The regulators seemed to test good,
Vin 3.39
Vout 1.25
both tested to the ground(adj)

I did notice that the power supply makes a noise about every 10-15 seconds. the sound of Electricity flowing, followed 1 second later by a repeat, maybe normal, just food for thought

[budm]

Re: Vizio vx37l hdtv10a

There must be other regulator voltage values on that board, I.E. 1.8, 3.3, etc. They can't all be 1.25V regulators.

[sbeck]

Re: Vizio vx37l hdtv10a

If a regulator is bad, will there just be nothing on the Vout?

[budm]

Re: Vizio vx37l hdtv10a

It the output can be lower or higher than what it should be, or be 0V. Soen of those regulator may be fixed, or adjustable regulators. You can tell if theya re good or bad if you read the link below my signature. There should always be 1.25v between the Output pin and the Adj pin, please read the link for details.

[sbeck]

Re: Vizio vx37l hdtv10a

I tested all that I could find, and still no luck, so I decided to check cables and alas, I got some progress. The T-Con board is an LG, and my guess is that when the T-con does not recieve proper signal it does the screen flash. The LVDS cable was loose/ bad. I fiddled with the connection at the tcon and got a picture, not a good one, but non the less something. Pictures are of the new results. Any ideas what is making the picture so bad?
Also I think the background is suppose to be Green not blue

[sbeck]

Re: Vizio vx37l hdtv10a

sorry to resurrect this, but what would cause that type of picture?

[bikerbuddy]

Re: Vizio vx37l hdtv10a

Shut down the TV, disconnect the T con board and power on the TV back up and see what the screen look like, if you have a lighted screen then it is possible your t con is bad .

[sbeck]

Re: Vizio vx37l hdtv10a

When I do that, the screen is black with only the back light on

[tom66]

Re: Vizio vx37l hdtv10a

That test proves nothing. Some panels are white when off, others are black. Most modern panels are black.