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20-09-2003, 07:48 PM
| #1 (permalink) |
| Senior Member Join Date: Jul 2003 Location: Pit, stone.
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| tft noise? The tft on my laptop makes a sort of quiet hissing noise, that you can only really hear when there's nothing else on. Is this normal, do TFTs make noise? I'm guessing its the inverter or whatever the bit that does the business is called... Any ideas? Is my backlight gonna go?? *edit* this is on my cheapo toshiba laptop; after firing my iBook up from sleep, it doesn't seem to make any noise at all. The iBook is running off the mains, whereas the tosh is off battery. *more edit* actually I don't know if it is the TFT after all, after switching it off, and after a short pause, the noise begins again. Hmm! Just the internals of the computer?? Thats the great thing about me mac, absolute silence! Well Hello! Last edited by daverobev; 20-09-2003 at 08:04 PM.. |
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21-09-2003, 12:02 PM
| #3 (permalink) |
| Happy Now? Join Date: Jul 2003 Location: Cardiff Home | Manchester Uni
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| Its cause TFT monitors are backlit by cathodes that use inverters. You're hearing coil whine from the transformer. I dont like sig pics so i turn off sigs  Which doesnt help when i dont know what ive written here! DOH! |
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21-09-2003, 01:47 PM
| #5 (permalink) |
| Firefox rules  Join Date: Jul 2003 Location: Canary Wharf/Richmond
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| I get coil whine from my laptop, most noticably when I open new windows or do anything that changes the brightness of the screen. It usually lasts under a second but there is an ever-so-slight noise normally anyway. This is with a 1600x1200 screen, so not a cheap one  |
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21-09-2003, 02:28 PM
| #6 (permalink) |
| Senior Member Join Date: Jul 2003 Location: Pit, stone.
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| Aaah man, a guy at work has a dell with 16*12 screen, and its just..eyestrain! But, very handy for dev work, which is what he does. I'll have to get me something bigger than 1024, and soon... Thanks for the replies...btw, coil whine? Well Hello! |
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21-09-2003, 03:09 PM
| #7 (permalink) |
| Firefox rules Join Date: Jul 2003 Location: Canary Wharf/Richmond
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| I've no problem with the screen, I just have the laptop closer than I would a normal desktop CRT or LCD. I can always whack the dpi up if necessary to make the text larger (and sharper than just dropping the resolution too). Coil whine is created by transformers, typically under load. I think it's to do with resonance of the metal through the expansion due to the increase in temperature combined with the frequency of the current, BICBW |
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