TV bea ba-4920s black screen

[Zippo978]

Hi everyone,
I have a TV with a black screen but working backlight.
Thinking it was the T-Con board, I replaced it, but the problem persists. I tried unplugging the flat cables connecting it to the panel, first one and then the other, but the screen remains black. I also tried masking the pins, but nothing, I don't know what to do.

Thanks everyone.

[Zippo978]

Does anyone have any ideas?

[nomoresonys]

Pictures would help, need good focused pictures of each board and one of the whole back as to see how everything is connected.

[Zippo978]

Sorry for the delay, here are the photos of the TV

T-Con	Main	Full view	Connecting to the panel

[lotas]

I tried unplugging the flat cables connecting it to the panel, first one and then the other, but the screen remains black.

It is necessary to install a jumper on T-CON between points FB331 - FB332 and then disconnect one LVDS cable at a time.

[x_orange90_x]

I had a similar situation with a TCL once before. The screen was blank no matter what I did. I gave up for a while and left it sit in the corner and then one day brought it back out for one last try. This time I actually got a half screen when disconnecting one of the ribbons. I found the pins for clock signals and blocked them and it's been working relatively fine in my son's bedroom since. It has noticeable lines from the missing signals, but from a few feet away it looks normal.

I suggest you keep trying with those ribbons. Also check near the HDMI and inputs for a reset button. If it has one you may need to hold that in/press it a few times. Short of this there could be an issue with the main board not out putting any video. In this case there *may* be a way to get the tcon to display a test pattern with the main board unplugged. I've never accomplished this, but some other members may be able to help with that.

[Zippo978]

It is necessary to install a jumper on T-CON between points FB331 - FB332 and then disconnect one LVDS cable at a time.

With jumper and the right flat cable removed I have half a screen, while with the left flat cable removed I have a black screen.

[Zippo978]

Thanks guys, between the jumper and the pin masking, the TV works now. It has some subtle horizontal lines, but they're only visible from very close up.
Thanks again.