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Laptop speakers buzzing and humming when on BATTERY power, more errors as well...

Posted on 2007-11-29
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Last Modified: 2013-11-17
I have a Sony PCG-8L1L Laptop here at work.

When the user first brought the PC in, it was getting a weird flickering on the LCD screen that was flashing white and black horizontal lines through the screen then the PC would shut down.  I took the battery out, and  put the battery back in and it booted up but the lines persisted.  I proceeded to plug the LCD into an external display and the lines continued on the LCD screen but not the external.  I decided there must be a loose connection inside the case, while I was documenting the white and black lines completely disappeared and I have been unable to recreate the error.  It seems that when I plugged an external display into the VGA the error has stopped?  Any thoughts?

Well, after trying to recreate the error time after time, I removed the AC power and the laptop's speakers started to buzz and hum.  I have seen this happen when AC power is in, but never when powered by battery.  As soon as I plug the AC power back in, the noise stops.  Any thoughts?

I am thinking there may be some interference coming from some type of electrical source that is causing the speakers and LCD monitor to glitch out and buzz and hum.  I am going to take the notebook apart today, but I was wondering if anyone has had any issues similar to this?
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Question by:JJB-Zenful
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>>  the white and black lines completely disappeared   <<   i suppose a bad contact in the cable, or the lcd causes it. - So check the video cable connection
>>   As soon as I plug the AC power back in, the noise stops   <<  can be your battery is on its EOL, and you're running on a slightly lower voltage.   You can test this with a known good battery
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by:JJB-Zenful
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I am going to respond to this for anyone who happens to be searching for a similar problem.

The black and white lines were caused by a loose connection on the monitor side of the cable.  Once I reseated the connection, the problem ceased completely and I haven't been able to recreate the error.

I was unable to get the humming to cease.  I didn't have an extra battery, but I did check and clean the terminals and the humming continued.  I wish I had an extra battery for this Sony Laptop to test out your solution Nobus, unfortunately...I didn't.

This can be closed.
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by:nobus
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then my first suggestion was right !
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by:JJB-Zenful
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Well, the laptop is back with the same problem after going 5 days and one business trip.

The user said that the errors started happening after he tried to use the mouse pad's side scrolling arrows and the directional pad?
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by:nobus
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let him test with an external mouse / keyboard to check if it happens then
Can be a bad touchpad
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by:JJB-Zenful
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Finally got the computer back today...time to play.
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by:JJB-Zenful
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Well, I have had the computer running here for quite some time and it has been error free since I initially pushed the power button.

If any experts here can tell me how to solve a problem that isn't occurring, let me know!
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by:nobus
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imho - you can't.
the only thing you can try is to produce the problem in any way you see fit : moving, bending, tapping ...heating, freezing...talk to him  lol
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I've left the laptop running all night...

So I set up no hibernation and/or stand-by to see if maybe the computer wasn't coming out properly.  I also setup the Windows XP screen saver (the one that looks like the splash screen) to run after 10 minutes.and continue to run.

Well, low and behold, I came in today to check on the laptop, and the error was happening!

I think the most important thing to note is that the laptop wasn't moved at all, so a bad connection between the screen and mobo doesn't seem like a solution.  I am noticing that each time the Windows XP logo warps to a new location, the screen is flashing.  It almost seems like when you watch a computer screen through a fan and you see the refresh rate.  Then when the logo stays at position, the error stops until the logo warps again.

Unfortunately, I don't have a replacement screen to test the current one in use.  Any thoughts?

Another important error the user let me know is when the flashing happens, his computer will eventually shut off and will not turn back on until he lets it sit for a while.

My theory is the battery which is on its last leg (only powers for 15 minutes) is causing the computer to overheat, which in turn is causing the screen to misbehave and flash lines and eventually leads to the computer powering down and not being able to boot.  Whew.

Thanks everyone thus far, any other ideas?!?!?!?!?!?!?!  
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by:nobus
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an external screen will do also.
for your theory, you can test it with a new battery, or, if possible, test this battery on another lappy.
You can also test how long the battery holds out.
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by:JJB-Zenful
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I've already tested an external monitor...but that really doesn't tell me if its the physical screen, connection, cable, etc...that is causing the problem.

The error is not reproduced on an external monitor, btw.

I am going to order a new battery for the laptop and see what happens from there...
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by:nobus
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if the error does not happen on the external; then one if the inside parts are bad.
the first thing to try is to reseat the video cable
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by:JJB-Zenful
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I've already done that as well, I've had the laptop torn apart and all the connections have been reseated.

Just another update, when something moves on the screen, thats when the problem is happening.

ie :Movie playing, video card testing software, new windows popping up, etc...

I am trying to download the latest drivers from the video card now, I doubt this is going to work, I really think it has something to do with the actually screen and the refresh rate...
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Another update...the computer just played the sound like something was inserted into a USB port and the computer restarted.

This is strange.
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by:nobus
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try a parrallel install on a separate partition, to check if it is software related, or put another disk in, and do a fresh install
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by:JJB-Zenful
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The screen flashes lines when in the BIOS, this would point away from software related errors...
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by:nobus
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then you have a bad lcd, or video card
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by:JJB-Zenful
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I am still going to say it is a bad LCD.

If it were a bad video card, it would also display the errors on an external monitor...correct?

Thanks for all your responses, I appreciate the suggestions.
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by:nobus
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probably yes, but there are is some different hardware involved for both cases
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