Having problems with your Acer AL1717 17" LCD Monitor ?

Acer 17" LCD Turns On & Off With A Buzz Sound

\015 I had a Acer 17" LCD given to me and the guy said that it started to turn on and off, then it would work for days and then the same thing again, I grabbed it and when I turn it on you here a small buzz then gone, it does this every 3 seconds and you can see a glint of a flash on the screen, I unplugged all the circut boards and held just the power board in my hand and everytime I plugged it in it started to make this noise so It is something on the board, it sounds like the yellow box thing . I am not sure if it is a easy fix or cheap.\015

Answers :

1.there are two rectifing semiconductor in the sm transformer secondery[out put]5v and 12 volt.check the 12 volt diode

2. check the flyback pulses from lightup section

satheesan karivellur
Not an easy fix in my opinion, power control board is faulty - relay/transformer.
\015\012I cant be certain though - look for damaged resistors/transistors.
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