Buzzing sound from LCD + backlight failure

Question

Dell Inspiron 15 (1545)

Released online on January 16, 2009, the Inspiron 1545 is a 15.6" budget PC laptop available with 3 or 4 GB of RAM. It succeeded the Inspiron 1525.

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Arman M @arman_aegit

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投稿日: 2017年10月28日

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Buzzing sound from LCD + backlight failure

Hi.

A buzzing sound is heard from the LCD of my laptop, which is a Dell Inspiron 1545. Its intensity changes when I increase the brightness. In addition to that, backlight fails when I increase the brightness (there is picture but no light) and I can use it only if the brightness is at the lowest. As far as I know, the latter indicates CCFL inverter failure. I opened it to investigate the noise and found out that the noise is coming from the LCD itself not the inverter. The noise is negligible and my main problem is the backlight.

Which one do you think is causing the backlight failure?

Does changing the inverter solve the brightness problem?

Thank you for your time and help.

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i have a dell 1545 too and i hear a buzzing noise too it only happens when the screen brightness is all the way down but when i turn it all the way up it goes away.

jordin young さんによる2018年4月30日

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i have a dell 1545 too and i hear a buzzing noise too it only happens when the screen brightness is all the way down but when i turn it all the way up it goes away. — jordin young

Alex Niculescu @alexniculescu 評価: 18.1千 27 26 33 · Answer 1 · 2017-10-28T08:46:32-07:00

Alex Niculescu @alexniculescu

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Hi!

Changing the inverter will solve your problem, as well as the buzzing sound you are hearing.

These inverters used to cause problems a few years ago; they aren't reliable, which is probably why they are barely used in modern laptops anymore.

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Thanks for your answer. Does changing the inverter solve the buzzing sound even if the sound is from the LCD itself?

Arman M さんによる2017年10月28日

Yeah, at least in theory. The inverter is basically a power supply; these buzz only when they are faulty and (quoted from Wikipedia :)) ):

The other major source of hum in audio equipment is shared impedances; when a heavy current is flowing through a conductor (a ground trace) that a small-signal device is also connected to. All practical conductors will have a finite, if small, resistance, and the small resistance present means that devices using different points on the conductor as a ground reference will be at slightly different potentials. This hum is usually at the second harmonic of the power line frequency (100 Hz or 120 Hz), since the heavy ground currents are from AC to DC power supplies that rectify the mains waveform.

Alex Niculescu さんによる2017年10月29日

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Dell Inspiron 15 (1545)

Buzzing sound from LCD + backlight failure

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