Quote:
Originally Posted by kf4rca
Got a 40" LED Samsung with a TCon board that has the 3 LEDs on it. Two of the leds are out. From what I read, that means a panel short. If I disconnect the right ribbon cable all leds stay lit. BUT I can reconnect the ribbon cable (while powered up) the leds stay lit and I get lines both sides.
This was, as you probably suspected, a road side find. So, what do you think? Thanks.
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Depends on the model. If it's a fairly new Samsung, it could be anything.
Ordinarily, disconnecting the offending ribbon would allow the good side to work on half a pic, but that's not true all the time. What I would do is watch the small square inductors for voltage. If you find one or more without voltage, remove the ribbons and restart the TV again. If the voltages come back and stay up, it's probably a shorted display panel.
A hack repair is to identify the bad side, remove the mask from the display, and *carefully* cut all the *side* tab flexible circuits off the display with a brand new safety razor or xacto (you do NOT want any pulling on the ribbon as you cut). The drivers on the good side of the board will usually drive the entire screen all the way across and look as if nothing happened.
If it's a display that shorted, you have nothing to lose by trying it.
Now, many newer TVs don't have side tabs: they drive the X columns using the drivers that share the Y drivers on the bottom, and the printed circuits inside the glass. If you have one of those, let me know. There's a hack for that but it's more involved.
John