LC-40E67UN SHARP No Picture

[1beertap]

Hey Guys,

I have a this tv which will power on and display a backlight but with no picture. On the main board, there is a small red LED that blinks. I am thinking that it could be either a bad main board or T-Con. Any ideas? Attached are the photos.

Thanks.

[dskall]

Re: LC-40E67UN SHARP No Picture

Check power to your t-con 12v coming in and various other voltages on t-con you can check.

[1beertap]

Re: LC-40E67UN SHARP No Picture

On the t-con, I tested 12.13v and fuse is good.

[1beertap]

Re: LC-40E67UN SHARP No Picture

After trying to connect a source to the correct input, I'm able to get sound from the tv. Now, I'm wondering if it is the t-con or panel?

[dskall]

Re: LC-40E67UN SHARP No Picture

There are a number of different voltages on the t-con that could be checked.

[1beertap]

Re: LC-40E67UN SHARP No Picture

There are a number of different voltages on the t-con that could be checked.

Could you please enlighten me to the locations and the possible values of such said voltages? I know of the 12v coming from the power supply.

[1beertap]

Re: LC-40E67UN SHARP No Picture

I have looked at the LVDS data lines and I see a pattern on the oscilloscope. Whether or not it's a good pattern, who knows but I also see that the lines are inverted pairs (meaning positive and negative). At this point I truly believe I have a bad t-con. I'm hoping the panel is not shorted in some way. I really would hate to put money into a good t-con to just die. Any thoughts? Thanks.

[dskall]

Re: LC-40E67UN SHARP No Picture

Probably a good mainboard if your getting signals on lvds. A lot of test points on t-con but don't see much identification for them. There are a couple of regulators and coils you can test for voltage.

[budm]

Re: LC-40E67UN SHARP No Picture

What do you see on the screen if you have the cable between the T-CON and the LCD panel connected one at a time?

[1beertap]

Re: LC-40E67UN SHARP No Picture

budm,

After unplugging one cable then vice versa, I am able to get both halves of the screen to come up with slightly different shades but for less than half a second after tv is first turned on. When I turn the tv off and back on again, in order to repeat, There is no difference between either side.

[budm]

Re: LC-40E67UN SHARP No Picture

https://www.badcaps.net/forum/attach...7&d=1489107014
That large SMD IC30 to the right is made to generate 4 Voltages for the LCD panel.
I cannot read the P/N of that IC then we may be able to see what is going on in that section.
Too bad that they did not have any markings for the Voltage test points.

[1beertap]

Re: LC-40E67UN SHARP No Picture

budm,

The part number for IC301 is THV3056.

[budm]

Re: LC-40E67UN SHARP No Picture

THV3056 spec sheet, then need to trace out the board to see if those Voltages are present or not. Or you can take a chance on new T-CON board.