Question about Philips SoHo 107T21 (White) 17" CRT Monitor

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High pitch sound being emitted

Hi, There is a very high pitched noise coming from the monitor; shriller while reproducing dark colours. The sound intensity reduces when the monitor is switched off and switched back on but slowly grows stronger again. Coming to think of it this sound has been always there albeit at lower intesity. Its only now, when the noise has become more shrill and painfull that I have been able to place the source as monitor.

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Re: High pitch sound being emitted

It could be a harmonic noise caused by dust inside the monitor. If you are qualified (brave enough) to remove the back cover, blow the entire inside of the monitor out with compressed air (carefully) that may help. It could also be the flyback transformer. In that case, you would have to have the transformer replaced (I wouldn't recommend doing it yourself unless you are a TV technican as the CRT can contain a static charge of 14,000-25,000 volts- even when unplugged)

Posted on Jan 04, 2008

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My GEM GL-1821A Computer monitor has a high pitch squeak that is intermittent in occurrence but sometimes continues for long periods of time. Got any ideas?

A high-pitch squeal is common in CRT TV sets and monitors. I've never run across this in an LCD monitor, but there's a first time for everything. If the sound isn't coming through built-in speakers (if this model has them) and is being caused by the computer, I would suspect the inverter circuitry. This provides power for the backlight, and there are transformers that may have become noisy. Because of their construction, it's possible for them to vibrate internally, and at a frequency that you hear as the high-pitched noise. There isn't a lot you can do to quiet them. When I worked on TV sets, I had mixed success using hot-melt glue to muffle the noise, but usually the only way to completely cure the problem was to replace the parts. It's unlikely you'll find the parts available for a monitor, so all I can suggest is to bear with the noise as long as the monitor is otherwise working properly. Or use this as an excuse to buy a new LCD monitor; they are quite reasonably priced these days.

Feb 16, 2011 | Think Computer GEM 15 Inch LCD BLACK...

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View sonic computer screen was dropped and now when you turn it on the picture comes on and then it emits a high pitched sound and turns off. any suggestions?

Sounds like you may have broke at least one of the lamps . The high pitch sound you are hearing is the high voltage that goes to it .

Feb 05, 2011 | ViewSonic OptiQuest Monitor

1 Answer

SyncMaster 793DF 17" CRT Monitor: monitor makes high pitch noise...

With a piece of wood or plastic hit the flyback with the monitor turned on. If you note some change in the noise. Replace the flyback.
Normally, it is the cause of the noise.

Warning: High Voltage!! Do at your own risk!!!!!!

Best regards,

May 16, 2010 | Samsung SyncMaster 793DF 17" CRT Monitor

1 Answer

How do i turn off the high pitched frequency noise

If what we are talking about here an old model of monitor that has a bulky back, the high pitched frequency is caused by other electronic devices such as your speakers.

- Relocate your speakers away from the monitor
- do a factory reset on all settings on the monitor or if possible, do a degauss.

Dec 16, 2009 | Computer Monitors

2 Answers

Loud high pitch noise

The noise could be from the fly-back transformer.
There are very high and dangerous voltages inside a CRT monitor.
As you are not an electronics technician, I suggest you do not try to fix it yourself, your eyeballs will light up if you poke your fingers in a wrong spot.
Get a quote for the repair, but the cost of monitors these days are fairly cheap and a repair may not be a cost effective solution. Consider getting a LCD monitor, they take up less room and they are very energy efficient.

Oct 28, 2009 | Apple Mitsubishi Diamond Pro 2060u 22" CRT...

1 Answer

Monitor Goes black, or flickers on and off

The high pitch sound is coming from the inverter. It is faulty and needs to be repaired or replaced. The inverter supplies high voltage to the CCFL lamp, this lamp gives the backlight to the LCD so you can see the LCD images.
Check out LCD parts for parts, service and DIY info. use this link :-

Aug 29, 2009 | ViewSonic OptiQuest Monitor

1 Answer

E153fp high pitched sound when on

Sounds like the LCD or the inverter are failing. Generally cheaper to replace than to fix

Jan 21, 2009 | Dell E153FP 15" LCD Monitor

1 Answer

Acer al1916b high pitched noise when on standby.

Sounds like you could have an open ground? Also might check the wiring to see if you have a faulty connection in VGA cable or power supply cable

Jul 24, 2008 | Acer AL1916B 19" LCD Monitor

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