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Main => Monitor/Video Forum => Topic started by: Ummon on February 18, 2008, 09:31:31 pm

Title: Why does it chirp?
Post by: Ummon on February 18, 2008, 09:31:31 pm

I read somewhere here that a bad cap(s) in the power section can cause a chirping sound when the monitor is powered up. Is it the cap chirping?

Title: Re: Why does it chirp?
Post by: grantspain on February 19, 2008, 06:41:57 pm

it chirps because its trying to start up but can't,caps can cause it but so can many other things.i prefer to call it "in trip"

Title: Re: Why does it chirp?
Post by: qrz on February 21, 2008, 07:59:16 pm

many switch mode power supplies will briefly chirp on initial power up .
if the supply exhibits excess noise ( hiss/chirps) during changes in load , there may be weak 'lytics.
still best to measure Dc voltages and for presence of AC ripple ( pulses )

a squealing smps has a strong likelihood of a heavy load (short) on a secondary .....


qrz

Title: Re: Why does it chirp?
Post by: Ummon on February 23, 2008, 01:01:25 pm

It's a constant chirp. The monitor won't display.

Title: Re: Why does it chirp?
Post by: qrz on February 23, 2008, 04:06:57 pm

check the secondaries for a high load. it may not be a dead short , but enough to keep supply from starting .

in tv's , a  faulty vert output ic is a common culprit.....

qrz