LCD Dying Symptoms?

Dekar12

Dekar12

Gawd
Joined
Oct 2, 2003
Messages
745
I currently have a vp201b that is just over 5 years old right now and just within the last few days I have started to notice a buzz/hum coming from my monitor. It has never made a noticeable noise previous to this, otherwise I wouldn't be concerned with it.

Nothing visually has changed as far as I can tell, it doesn't have speakers or anything extra hooked to the monitor. When it is off or in 'sleep' mode there is no noise coming from the monitor.

Is this a sign that it is dying?
I have seen other threads about people fixing some LCD's if the capacitors are the things that go bad on the pcb internals. Anyone know if that is a common cause of death on this model?

And finally, if it is nearing the final electronics graveyard, would the HP LP2475W be an acceptable replacement in comparison to what I currently have.

I want to stick with at least the 1200 height and an IPS panel, but I don't really feel like paying the $800+ that I paid the first time for my vp201b. And I think the HP is in the 500-600 range where all the other IPS with my resolution requirements are closer to 1k.

Any help is appreciated!
 
The Dell u2410 is 1920x1200 and is roughly $460 after Bing cashback on the Dell Ebay Store.
 
After messing with some settings it seems that if I move the brightness all the way up the buzzing completely stops.

However as soon as it is off 100% it starts to buzz again. Even at 0% it still buzzes, so seems like it is definitely something with the backlight that is making the noise.
 
Reducing brightness on LCDs is done with a PWM switch. Basically, PWM turns the backlight on and off many times per second, creating a perceived dimness. At 100% brightness, there's no cycling, so there can be no noise from that. The more you dim the monitor, the more on/off cycles you generate, so you get more noise as the monitor gets dimmer.
 
hmm... so that part that controls the modulation is prolly going bad then, since it never buzzed previous to this and I have never touched the settings on my monitor after the day I set it up. /sigh
 
evilsofa said:
Reducing brightness on LCDs is done with a PWM switch. Basically, PWM turns the backlight on and off many times per second, creating a perceived dimness. At 100% brightness, there's no cycling, so there can be no noise from that. The more you dim the monitor, the more on/off cycles you generate, so you get more noise as the monitor gets dimmer.
Click to expand...

Huh. I would have thought the opposite was true. It seems like at a high brightness, there would be more/faster cycling and then less or slower cycling as you decreased the brightness. I'm not contending your statement, but it just seems counter-intuitive to me.

Would it stand to reason then that a low brightness could actually decrease the lifespan of the backlights due to more cycling?
 
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