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Monitor
- Thread starter S1ght
- Start date
heh... for you to fix that yourself will shock you badly : )
at the back of your tube is a round rubber cap, that is called the Cathode cap ( i think) what's happening is, moisture / dust got in under the cap, and its not insulated properly, and its causing the thing to ark with the actual carbon on the back of the tube. - that is causing the high pitch squeal. Best thing to do, take it in to a repair shop, because if i tell you how to fix it yourself, you might end up hurting yourself and i'll get blamed
at the back of your tube is a round rubber cap, that is called the Cathode cap ( i think) what's happening is, moisture / dust got in under the cap, and its not insulated properly, and its causing the thing to ark with the actual carbon on the back of the tube. - that is causing the high pitch squeal. Best thing to do, take it in to a repair shop, because if i tell you how to fix it yourself, you might end up hurting yourself and i'll get blamed
Last edited:
nGAGEd55
Expert Member
Mine starts making sounds like that when its set to 85Hz, so maybe try another refresh rate, just dont go below 72Hz, cos apparently that might cause headaches and so on. It might also just be you thats hearing it, cos in my family im the ONLY one that can hear it.
Lol, now we gonna, see who all the strange ppl are who hear and see stuff.
No i suppose, its how sensitive ure ears are, when my fiend used to press the light on his watch, it used to make this terrible peircing noise, that only me and animals seemed able to hear.
No i suppose, its how sensitive ure ears are, when my fiend used to press the light on his watch, it used to make this terrible peircing noise, that only me and animals seemed able to hear.
nGAGEd55
Expert Member
lol.. i had a watch that also only i could hear when the light is on4cer said:
it's probably the flyback transformer making that noise, as described by LabAnimal..
Why do some folks hear it and others dont? Because it is normally at around 16000hz..which means young kids can hear it fine, but adults (whose hearing drops off in the upper frequencies once we get past 20yo or so...) simply dont hear it at all. Your dog, however, may act a bit strange.
If you are above 40yo, then it is doubtful you will hear it...so dont take it to an old tv repairman
coz he wont be able to diagnose the fault (he cant hear it...hehehehe)
It is more common in tv's, and can normally be fixed with some glue. Not bostik...glue that doesnt have any alcohol/solvents that can explode in it. (model builders will know of glue called "dope"...use that)
Best bet, take it to a tv repair place, tell them the flyback transformer is buzzing, they will fix it. It doesnt need fixing though, if you can live with the noise it will last another 20 years or so., lol.
Why do some folks hear it and others dont? Because it is normally at around 16000hz..which means young kids can hear it fine, but adults (whose hearing drops off in the upper frequencies once we get past 20yo or so...) simply dont hear it at all. Your dog, however, may act a bit strange.
If you are above 40yo, then it is doubtful you will hear it...so dont take it to an old tv repairman
coz he wont be able to diagnose the fault (he cant hear it...hehehehe)It is more common in tv's, and can normally be fixed with some glue. Not bostik...glue that doesnt have any alcohol/solvents that can explode in it. (model builders will know of glue called "dope"...use that)
Best bet, take it to a tv repair place, tell them the flyback transformer is buzzing, they will fix it. It doesnt need fixing though, if you can live with the noise it will last another 20 years or so., lol.
swordfish1
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basicaly that means that you need to walk to the shop and buy new LCDS1ght said:Does anyone know what it means when you're monitor starts making a high pitch sound?
I have seen CRTs explode with an actual flash and big bam!, fortunatelly from the back of the monitos. As far as I know they transform the 220V into something ridiculous like 10,000V to make it work. So it is quite dangerous piece of equipment
My UPS used to scream (overload) for a 1-2 sec every time I switched my old single CRT on. Now I have 3 LCDs connected to the same UPS and it doesn't notice at all when all 3 of them get switched on simulatenously oh yes, dont forget that inside every tft monitor is an inverter (or even two, dpeending on how many tubes you have)...which transforms 220v into something ridiculous like 20000v and they can explode to. I have been burned by prodding an inverter in the wrong place at the wrong time...not funny. Minor burn, but a dangerous piece of kit nonetheless.
p.s. inverter whine is very common also....you just cant get away from display devices which like to scream at you, hehehehehe
p.s. inverter whine is very common also....you just cant get away from display devices which like to scream at you, hehehehehe
swordfish1
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please explain, I don't think that TFT monitors got tubes? And AFAIK they transform the 220V into something like 20V to operate ... so how did that happened? I could be wrong though ...werner said:
ok, i said "tubes" and everybody thinks "tv tubes" heheheh
ccfl, backlights, call 'em what you want...they need a high voltage to start operating. this is achieved by taking the 12v or whatever is fed to the lcd and running it through an inverter circuit to boost it up into 20000v or thereabouts.
a 30" lcd tv can have up to 40 of these ccfl/fluorescents/backlights/tubes in them...how they are interfaced to the inverter/s depends on the design guys, but dont kid youself into thinking it is a "safe" place to swing a screwdriver. The inverter take the dc voltage and amps it and chops it up to produce extremely high voltage ac current, which is what the ccfl's or whatever use to power up.
quote: !DANGER! !DANGER! !DANGER! !DANGER! !DANGER! TAKE EXTRA PRECAUTIONS WITH THE !BACKLIGHT INVERTER! THE AC INVERTER LOOKS TINY AND HARMLESS BUT UNDER THE RIGHT CIRCUMSTANCES . . .
!IT CAN KILL YOU!
ELECTRIC SHOCKS CAN SEND YOU TO THE HOSPITAL EMERGENCY ROOM WITH CUTS, SPRAINS OR EVEN BROKEN BONES FROM DOING A !BACKFLIP! THAT YOU ACTUALLY CAN'T DO! (NEVER ASK ME WHY I KNOW THAT!)
/quote
taken from here
http://www.eio.com/public/lcd.1998/0936.html
enjoy
ccfl, backlights, call 'em what you want...they need a high voltage to start operating. this is achieved by taking the 12v or whatever is fed to the lcd and running it through an inverter circuit to boost it up into 20000v or thereabouts.
a 30" lcd tv can have up to 40 of these ccfl/fluorescents/backlights/tubes in them...how they are interfaced to the inverter/s depends on the design guys, but dont kid youself into thinking it is a "safe" place to swing a screwdriver. The inverter take the dc voltage and amps it and chops it up to produce extremely high voltage ac current, which is what the ccfl's or whatever use to power up.
quote: !DANGER! !DANGER! !DANGER! !DANGER! !DANGER! TAKE EXTRA PRECAUTIONS WITH THE !BACKLIGHT INVERTER! THE AC INVERTER LOOKS TINY AND HARMLESS BUT UNDER THE RIGHT CIRCUMSTANCES . . .
!IT CAN KILL YOU!
ELECTRIC SHOCKS CAN SEND YOU TO THE HOSPITAL EMERGENCY ROOM WITH CUTS, SPRAINS OR EVEN BROKEN BONES FROM DOING A !BACKFLIP! THAT YOU ACTUALLY CAN'T DO! (NEVER ASK ME WHY I KNOW THAT!)
/quote
taken from here
http://www.eio.com/public/lcd.1998/0936.html
enjoy
NightWulfe
Well-Known Member
LabAnimal said:heh... for you to fix that yourself will shock you badly : )
at the back of your tube is a round rubber cap, that is called the Cathode cap ( i think) what's happening is, moisture / dust got in under the cap, and its not insulated properly, and its causing the thing to ark with the actual carbon on the back of the tube. - that is causing the high pitch squeal. Best thing to do, take it in to a repair shop, because if i tell you how to fix it yourself, you might end up hurting yourself and i'll get blamed
I agree ^^^
Spend the R1400 and get yourself a TFT...