General > General Technical Chat
Just because technology can do something, doent meant its always right
tooki:
And even today, there are online shops with gazillions of CCFL backlight tubes, as well as LED retrofit kits.
james_s:
--- Quote from: Miyuki on July 19, 2022, 09:12:40 am ---Did you ever meet a panel with a dead backlight? I never.
I had 2 monitors failures in my life and both were processor board issues causing artifacts.
And both lasted well over 10 years.
--- End quote ---
Yes, I've fixed two of them and scrapped four more of them, one because the 65" panel cracked while we were lifting it out of the frame. It's very common with modern LED lit LCD TVs, it's actually the most common failure mode I've encountered. Look online for LCD TV LED backlight failures and you'll see lots of examples. Typically one or two LEDs will fail and that causes the driver to shut down after a few seconds.
The TV I'm currently using was less than 2 years old when the backlight failed and it was given to me. Another that I fixed was a similar age, that one was edgelit.
That's just the LED backlights, I've seen scores of worn out CCFL backlights. Often replacing the tubes isn't worthwhile because the plastic optics turn yellow from the UV. I took apart one panel where the diffuser sheets crumbled to bits they were so brittle.
tom66:
I have fixed a few LED TVs with bad backlights but the reliability has improved somewhat.
Part of the issue was the earlier TV backlights were pretty much set at full brightness from the factory for maximum wow. Just reducing brightness to 80% reduces current by roughly 40% (because gamma curves) and massively extends their lifespan.
4K panels generally need brighter backlights due to their smaller pixel pitch (less active pixel area) which is one reason (the other being eye strain) that I run my Samsung monitors at 25% brightness.
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