Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

[Dannyx]

Good day folks. I think I somehow managed to trash this ue40f5000 I was working on and I'd like to hear some thoughts about what could've gone wrong along the way: it came in with a dim stripe at the top of the screen, suggesting a dead LED strip, so I disassembled it, took off the LCD panel and sure enough, one of the strips in the top series of 3 had a LED that would not longer light up, preventing the other 2 strips from lighting up as well. So I replaced the LED, bla bla, all went good, the backlight came on fully, so it was time to reassemble the TV. I did so, but when I plugged it in for the first time, to my dismay, there was no more picture: the backlight came on, but that was about it - no other signs of life. I'm now pretty shocked, since this isn't the first time I disassemble an LCD panel, so I can't possibly understand what broke down: is it the T-Con, or the panel buffer ? I'm suspecting the panel, since I took the T-con off the chassis while I worked on the strips, so there was no way it could've suffered anything...but then, neither could've the panel: I laid it flat on a table, with the buffers hanging off the side like I've always done so far, but yet it decided to die on me ! I tried disconnecting the buffers from the T-con one at a time and this is what happens: when I disconnect one of them (can't remember which - there's 2 of them by the way), I DO get a bit of picture on the side that's still attached (it looks pretty solarized, but at least it's showing up, and I'm expecting this to be normal behavior when just one buffer's attached). However, if I swap them around and connect the other buffer, the screen stays blank, so that's why I think this is the buffer that died. My workmate tried something pretty interesting as well, which further points me towards a dead panel: he connected the buffer that appears to be working (the one on the left, I think) to the connector on the RIGHT of the T-CON, which normally goes to the left buffer (he flipped the buffers around essentially) and there was still some picture coming on (this is to confirm the T-CON is OK and outputs a signal on both connectors). Still, I have no idea how the panel could've died like that. What do you think ?

[freakaftr8]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

If he connected the left ribbon cable to the right side of the tcon that's instant death for an LCD panel as the drive signals are reversed.

[Dannyx]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

If he connected the left ribbon cable to the right side of the tcon that's instant death for an LCD panel as the drive signals are reversed.

Could be, though he did that after we already noticed there's no more picture. It's possible he killed it "even more" now

[samsystem89]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

dell 5110 no usb2 سپاس

[samsystem89]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

Sorry

[dick_barton]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

Has it blown the fuse on the Tcon board or has the Tcon lost some of its on board supplies due to the swapping of connectors?

[CapLeaker]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

that thing is trash now all right.

[Dannyx]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

Has it blown the fuse on the Tcon board or has the Tcon lost some of its on board supplies due to the swapping of connectors?

Fuse still has 12v going through it...don't really know how to check other things though. I can take a picture of the T-con.

[xristos glezellis]

Re: Samsung UE40F5000 no more picture after LED replacement (wtf broke?)

Check the board after t-con