Vizio vw46l weird picture

[Malachi]

Re: Vizio vw46l weird picture

Would it be this? I was in the process of taking the shield off when I took the pic and posted it.

[budm]

Re: Vizio vw46l weird picture

That is the LVDS cable, the switched 12VDC is generated form this main board.
There are two white fuses on the main board by the connector from the power supply board, should have 5VTSBY on one fuse and switched 12V on the other fuse.
You should also have 12v at that small jumper wire (L57) with two small black beads on it near the bottom end of the LVDS connector.

[Malachi]

Re: Vizio vw46l weird picture

Getting 5 and 12v.

[budm]

Re: Vizio vw46l weird picture

How about on the L57 (Jumper wire with two small black beads) near the bottom end of the LVDS connector?

[Malachi]

Re: Vizio vw46l weird picture

0v.

[budm]

Re: Vizio vw46l weird picture

OK, I do not know what happen to you main board, it is not sending switched 12V.
Anything got shorted out when you had the shield removed the first time?
Disconnected the LVDS cable from the main board and see if you will get the 12VDC at the jumper.

[Malachi]

Re: Vizio vw46l weird picture

What is the jumper?
Btw I do get around 1.2v on most of the points on the lvds cable where it is connected to the tcon.

[budm]

Re: Vizio vw46l weird picture

What is the jumper?
Btw I do get around 1.2v on most of the points on the lvds cable where it is connected to the tcon.

You have to have the 12V for the T-CON to run, other low Voltages are the LVDS signals, clocks, etc. they do not matter at this point.

[Malachi]

Re: Vizio vw46l weird picture

If the jumper wire is the L57 as I know see that you said before that it is, it reads 0v with the LVDS disconnected.

[Malachi]

Re: Vizio vw46l weird picture

As I sat and ate dinner I got to thinking about the 12v. And decided to measure if there is 12v at the other end.
The fuse is shorted. No 12v coming out of it.
I didn't do anything to short it. No way I'm going to replace that fuse and even if I did, who knows what caused it to blow.
Could the tcon I got cause the fuse to blow?

[budm]

Re: Vizio vw46l weird picture

At this point we need to have 12VDC present at that jumper, that jumper has the connection all the way to the SMD fuse on the T-CON board, if you check the resistance between the SMD fuse on the T-CON and the jumper it should show very low resistance (around 1 Ohm or so) right now.
We need to find out if the MOSFET is getting 12V feeding the it or not and if it is getting the command to turn on the MOSFET to allow the 12v to pass through it or not.

[Malachi]

Re: Vizio vw46l weird picture

It's less than 1ohm.
It reads 0.2 ohm.

[budm]

Re: Vizio vw46l weird picture

It's less than 1ohm.
It reads 0.2 ohm.

So the connections are fine, you are just not getting the 12V to feed it, so more in-depth troubleshooting on the main board is required now at this point, something must have happened to your main board.

[budm]

Re: Vizio vw46l weird picture

Need to get the P/N of that U37 on the main board.
You should have 12VDC on that SMD resistor R351 next to U37..

[Malachi]

Re: Vizio vw46l weird picture

Could that have been the problem all along with the picture you think? I don't have the skill to replace the fuse, so even if we find that it is the mainboard I can't fix it.
A mainboard on eBay is $80, it is missing the stand and the remote. By the time I buy all that stuff it's a loss, even though I got the TV free.

[Malachi]

Re: Vizio vw46l weird picture

U37 is 5953GM.

[budm]

Re: Vizio vw46l weird picture

Why do you think the fuse is bad?
No 12V will cause you not to have pictures at all, but you did have pictures so the 12V was present, so I do not know what happen after you installed the new T-CON board.

[Malachi]

Re: Vizio vw46l weird picture

The 12v fuse you had me check before only has 12v on one side of the fuse. The 12v is getting to the fuse but not getting out.
I put my meter in diode mode to check it also, no beep, so doesn't that mean it's shorted?
I know I'm a noob but doesn't that indicate a shorted fuse?

By the way, I just checked again on eBay, there is a mainboard for $28.

[Malachi]

Re: Vizio vw46l weird picture

Need to get the P/N of that U37 on the main board.
You should have 12VDC on that SMD resistor R351 next to U37..

No 12v on R351.

[budm]

Re: Vizio vw46l weird picture

Didn't check that. I have to figure out which one that is but I'm not getting any voltage on the VGMA that you had me measure the other day.

No voltage at all on F1.

But you had indicated that you have no Voltage at all at the fuse so I assume you check the fuse resistance and Voltage at both ends of the fuse.
And it did not make any sense not to have 12V at that L57 either whether the fuse on the T-CON is good or not.
So the new board has bad fuse too then?