Vizio 26" VW26L Flickering white screen

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

Not good news for your chassis, you have one of those LCD panel with integrated T-CON board (some kind of setup uses in the small PC LCD monitor). You will have to take the LCD pnael apart to get to the board to check the fuse, not sure if it will be worth it for 26" TV

Budm What size do you think the board is . I can see the edge of a green board where the ribbon cable connects to the frame but it is small. That's the board your referring to? The fuse in on that board is that correct?

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

It looks like it's integrated into the main board, there's a ribbon cable coming off of the top left. I just got a 47" Vizio E471VLE today, same thing..

That's right it is the same setup

[budm]

Re: Vizio 26" VW26L Flickering white screen

The board will be long skinny board, may have two linking together. They are making sure you cannot fix the TV since you cannot change the T-CON board by itself.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

The board will be long skinny board, may have two linking together. They are making sure you cannot fix the TV since you cannot change the T-CON board by itself.

Budm ,So is it possible to change and is that where you think the problem is? What should I do?

[budm]

Re: Vizio 26" VW26L Flickering white screen

That boards had flexible board that is bonded to the board on one end, another is bonded to the LCD panel, basically not replaceable. At this point you can try disassemble the panel to see if you can locate the surface mounted fuse.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

Budm, I will take it apart . I read that this could be a cap problem to. should I recap the power supply board even thou they look good. what do you think?

[budm]

Re: Vizio 26" VW26L Flickering white screen

Right now you have flickering backlights but at least you still have the backlight source for lighting up the screen, so you need to fix or find out why you are not getting the pictures on the screen first. The flickering may be due to bad caps but it does not make sense to fix the lights first. Once we verify that the fuse is good or bad and if it does have voltage on it or not, and able to get the pictures back, then you can work on the other section of the TV. The main board may not be sending out the voltage to the T-CON. So if you cad take good close up picture of the LVDS connector on the main board, then i may be able to tell you which pin is the B+ output pin for feeding the T-CON board, so lets do that first.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

Right now you have flickering backlights but at least you still have the backlight source for lighting up the screen, so you need to fix or find out why you are not getting the pictures on the screen first. The flickering may be due to bad caps but it does not make sense to fix the lights first. Once we verify that the fuse is good or bad and if it does have voltage on it or not, and able to get the pictures back, then you can work on the other section of the TV. The main board may not be sending out the voltage to the T-CON. So if you cad take good close up picture of the LVDS connector on the main board, then i may be able to tell you which pin is the B+ output pin for feeding the T-CON board, so lets do that first.

Thanks Budm Iwill do that tomorrow.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

Right now you have flickering backlights but at least you still have the backlight source for lighting up the screen, so you need to fix or find out why you are not getting the pictures on the screen first. The flickering may be due to bad caps but it does not make sense to fix the lights first. Once we verify that the fuse is good or bad and if it does have voltage on it or not, and able to get the pictures back, then you can work on the other section of the TV. The main board may not be sending out the voltage to the T-CON. So if you cad take good close up picture of the LVDS connector on the main board, then i may be able to tell you which pin is the B+ output pin for feeding the T-CON board, so lets do that first.

Budm, Here's some pictures you wanted of LVD also picture of tear down. any ideas on how to remove the board I circled it in the picture,Thanks

[selldoor]

Re: Vizio 26" VW26L Flickering white screen

Bud wants a picture of the area of the board (Top left Corner in the out of focus picture) where the Flat LVDS plugs into the main board.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

Bud wants a picture of the area of the board (Top left Corner in the out of focus picture) where the Flat LVDS plugs into the main board.

Selldoor thanks for the help ,is this the picture budm wants?

[selldoor]

Re: Vizio 26" VW26L Flickering white screen

I think so and perhaps the part number on that Q6 8 legged component.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

I think so and perhaps the part number on that Q6 8 legged component.

Selldoor Here's the number 4405 BA8Y24

[budm]

Re: Vizio 26" VW26L Flickering white screen

That is the one, Q6 is the MOSFET for supplying the swithced B+ to the T-CON. Check the DC voltage on pin27, or 28, or 29 of the connector (chassis as ref ground).
When TV is off, you will have 0V, when TV is on you should have either 5V or 12V (depends on the LCD panel design).

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

That is the one, Q6 is the MOSFET for supplying the swithced B+ to the T-CON. Check the DC voltage on pin27, or 28, or 29 of the connector (chassis as ref ground).
When TV is off, you will have 0V, when TV is on you should have either 5V or 12V (depends on the LCD panel design).

Budm checked pins 27,28 and 29 power off ov on all 3 pins. Power on all 3 pins had 11.39v

[budm]

Re: Vizio 26" VW26L Flickering white screen

That means the main board is sending out the voltage OK, now hook the LVDS cable back up and see if you still get the voltage. If you do, then you will have to take apart the LCD panel next.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

That means the main board is sending out the voltage OK, now hook the LVDS cable back up and see if you still get the voltage. If you do, then you will have to take apart the LCD panel next.

Yes still get voltage

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

That means the main board is sending out the voltage OK, now hook the LVDS cable back up and see if you still get the voltage. If you do, then you will have to take apart the LCD panel next.

Budm, I took another close look at the tcon board and I could see the fuse you were talking about checking I didn't take out the lcd. I tested the fuse(white) it is good. See picture I have the fuse circled.

[budm]

Re: Vizio 26" VW26L Flickering white screen

Well that means there are more circuits on the board have failed, there are voltage regulators and switching power supplies on the T-CON that will need to be checked out next.

[CR Designs]

Re: Vizio 26" VW26L Flickering white screen

O.k will finish tearing in down, Thanks