Lg 49uf770v no picture

[andrews7523]

Hi guys in need of Help and assistance. The Tv comes on fine but has no picture which would believe me to be the Tcon board in my experience. The difficulty I'm having is the Tcon board which is in my set is not the same as the ones listed on Ebay as i found out to my expense. The Tcon that is in my set only has numbers but no actual part number. I was told by a frien that the Tcon board can be found by what screen is in the Tv.......

[andrews7523]

Re: Lg 49uf770v no picture

i put the picture of a sony screen by accident pls disregard this picture

[ReeceyBurger123]

Re: Lg 49uf770v no picture

Do you get backlight ?

[andrews7523]

Re: Lg 49uf770v no picture

yes

[budm]

Re: Lg 49uf770v no picture

Did you check the DCV at both ends of the SMD fuse on the T-CON against chassis GND?
So those pictures in post 1 are all wrong?

[andrews7523]

Re: Lg 49uf770v no picture

i don't know how to do that, if there is any low voltages is there a way of repairing the tcon?

[budm]

Re: Lg 49uf770v no picture

So what kind of tools do you have?
So pictures #5 on post 1 is the TC-ON board you have?

[andrews7523]

Re: Lg 49uf770v no picture

yes thats correct budm picture 5 is the tcon. I have a multi metre

[vinceroger69]

Re: Lg 49uf770v no picture

hi put your multi meter on dc volts with the tv turned on place the black probe on the metal tv chassis and touch the red probe to each side of the white fuse on the tcon board write down the voltages thanks, just be carfull you dont slip taking voltages as you dont want to short anything out!

[andrews7523]

Re: Lg 49uf770v no picture

wheres the white fuse? Do you mean each side of where the tcon connector goes in?

[vinceroger69]

Re: Lg 49uf770v no picture

where the t con connetor socket is just above it theres a little white fuse has a o on it just touch the red probe tip to each side of it and take voltage reading.

[duffar]

Re: Lg 49uf770v no picture

Hey, I have the exact same problem. my LG 49UF770V has no picture but the sound is working and the backlights come on. I have swapped out the T-CON board for a new one but the result is the same! Anyone have any suggestions? I've just ordered a multi-meter so I will take some readings tomorrow. What voltage should I be reading on that fuse? 5V?

Thanks

[andrews7523]

Re: Lg 49uf770v no picture

Mine had the wrong mainbaord fitted

[CapLeaker]

Re: Lg 49uf770v no picture

Mine had the wrong mainbaord fitted

Not to start anything... but how did you get to that conclusion?
Did you actually verify the LVDS signal on a oscilloscope?

[andrews7523]

Re: Lg 49uf770v no picture

Because the sticker on the board said 55uf770v and mine was a 49"

[CapLeaker]

Re: Lg 49uf770v no picture

So the TV must have never worked out of the box?

[andrews7523]

Re: Lg 49uf770v no picture

Thats correct

[vinceroger69]

Re: Lg 49uf770v no picture

some tvs though you can alter the panel size in the service menu so the mainboard may of worked then got faulty or maybe a previous owner swopped it out, the main thing is the set is working now so alls good.

[andrews7523]

Re: Lg 49uf770v no picture

What setting does the multimeter have to be on to check the fuse? Ohms?

[CapLeaker]

Re: Lg 49uf770v no picture

Depends on how you test it. While the DUT powered off, test the fuse with your DMM in ohms, continuity or diode mode. A short or beep tells you the fuse is good.