Quote:
Originally Posted by dr.ido
The Samsung LCDs plagued with bad capacitors are a few years older than the LED backlit models.
I'm starting to see the first of these come in with actual faults (cracked panels from accidental damage is far more common).
Most of these have had tab bond failures in the LCD panel itself. Where the failure occurs between the tab and PCB it may be repairable (my attempts so far have failed, but I have seen it done). When the failure is between the tab and the panel the only option is to replace the panel (usually not viable).
Other have had LEDs fail in the backlight. The shows as a dark area in the picture or causes the backlight driver to shutdown. Also repairable, but probably not viable.
LED backlights in general don't seem to last as long a CCFL backlights.
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Did you really think the LED BL sets would outlast CCFL tubes? I never really did. I DO admit..they LOOK a LOT better--especially those with a modulated-BL, AKA as "dynamic dimming" or Dynamic contrast". BUT--they do NOT seem to hold out real well. Not surprising--when you consider how hot those LED chips have to run. Often--a string of them will be driven with about 100-200 volts, and varied by the dimming ckt. If modulated---there will be from 4-16 separate ckts, driving separate strings all over the panel. These modulator boards do NOT seem to be ultra-reliable, either...
I REALLY do think...that before long..people will be BEGGING to get back to that old, reliable, durable, proven, long-lived , inexpensive display device....the CRT !! With its few faults (heavy, bulky, in particular) it IS the BEST.