TCL Black screen

["AD"]

Hello there!

I need help troubleshooting a TCL model 55FS3750. What I'm getting when I turn it on is just a black screen. These are the things I have done so far:

1) I removed the back cover, and I can see the while light through the holes, so I think I have back light.

2) If Im standing behind the TV, and I remove the left cable of the T-Con board, that half (left side) of the screen turns while, and the other half (right) displays good image.

3) If I do exactly what I did on point 2, but on the other side of the T-Con card, the whole screen remains black.

I originally assumed I had a bad T-con card and bought another. Used; of course, but I get exactly the same issues.

Do you guys think I might have purchased a bad T-Con card with the same problem, or it's more likely the source of the problem is something else?

Thanks in advance,

AD.

[zomi]

Re: TCL Black screen

You have a short on that side of the panel

Look on the pcb connected to the lcd on the side with no picture
and check the capacitors for shorts.

Remove and that tested shorted and test them off the board as well
If you get lucky will be 1 or 2 shorted caps..
Thats where i would head next.

Tcon looks good to be honest.

[budm]

Re: TCL Black screen

Yep, look for shorted caps on the Tb bonding board first on that bad side of the screen.

["AD"]

Re: TCL Black screen

Thank you guys,

I will do that next this afternoon and share results.

Regards,

["AD"]

Re: TCL Black screen

Hello Guys,

I was really hoping to open it up, and find something obviously wrong, but it seems normal to me. Unfortunately, my cheap multimeter from Harbor Freight does not have the function for the continuity with the beep, I'll get a better one, honestly it's long overdue.

That being said, what I tried to do as a test (please tell me if it was a bad idea), was putting the ground lead to a ground on the board, with the tv connected and on, and measure voltage at all the capacitors. Voltages did vary among the capacitors, but there was a few of them that gave me 0v at either leg, so I'm guessing those could be bad?

I'll attach the pictures of the pcb (I split it in 3).

Also, >if< those are bad, how do I know what are the capacitor's specs to replace them?

Thanks in advance.

AD

[budm]

Re: TCL Black screen

You have two ribbon cables from the T-CON board to those tab bonding board, where is the pictures of the bad side that you disconnect?
Just start checking the resistance to see if any one of those SMD caps (on the bad side of the tab bonding board) have low resistance or not.

["AD"]

Re: TCL Black screen

Hello, Thanks for answering,

Those 3 pics are the ones of the bounding board connected to the side of the T-CON with the bad image. I just split them in 3 so the image will not get too blurry when zooming in (to look but an obvious damaged capacitor). Attached is the picture of the hole thing. In this case, is the side with the ribbon cable I marked as "1".