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Author Topic: Why does it chirp?  (Read 1454 times)

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Ummon

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Why does it chirp?
« 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?
Yo. Chocolate.


"Theoretical physics has been the most successful and cost-effective in all of science."

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People often confuse expressed observations with complaint, ridicule, or - even worse - self-pity.

grantspain

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Re: Why does it chirp?
« Reply #1 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"

qrz

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Re: Why does it chirp?
« Reply #2 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

Ummon

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Re: Why does it chirp?
« Reply #3 on: February 23, 2008, 01:01:25 pm »
It's a constant chirp. The monitor won't display.
Yo. Chocolate.


"Theoretical physics has been the most successful and cost-effective in all of science."

Stephen Hawking


People often confuse expressed observations with complaint, ridicule, or - even worse - self-pity.

qrz

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Re: Why does it chirp?
« Reply #4 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