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Componenet failure Acer aspire 5920 I do not know if its a diode or capacitor. Anyway when I go to power on I get nothing. My power adapter light goes dim. Does anybody have any idea on how to identify the component and its value ?

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  • sshearer09 Mar 18, 2010

    Ken Thank you so much for your help. Sorry this took so long to comment. Your solution worked very well ! thanks again.

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Start up circuit problem, double check the output voltage on the adapter should be between 16vdc -20vdc, if ok connect a load to it example dc bulb/led or the battery of the laptop, if it remains on the adapter is ok, next check the laptop battery, remove it from the laptop and using a meter check the voltage and polarity.monitor the voltage to see if it is falling or holding,it should be holding, if all is well the next step is to check the voltage at the switch, this requires you to take apart the laptop to trace/test the voltage form the input to the battery to the mainboard to the switch and back to the mainboard. if the voltage is not present on the main board you will have to check the components to see which one is defective,if a protection diode it will be a very small component (smd) usually black in color and located close to the input connector.you will have to replace it,which will require some special tools and a lot of steady nerves.if a capacitor it will be brownish in color (smd)Surface Mounted Device.
Hope this helps
Ken.

Posted on Nov 16, 2009

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Posted on Sep 26, 2010

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My Asus Laptop won't turn back on, there is a chemical smell, and my adaptor green light brinks


Here below are possible causes and troubleshooting steps of laptop that can't power on, hope it may help:
Possible causes:

1. AC adapter failure.
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3. Motherboard failure.

Possible troubleshooting steps and repair solutions:
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2.It's possible that power jack (socket where you plug the AC adapter) is broken. Remove the motherboard and take a closer look at the power jack. In some cases you can fix the jack by resoldering it on the motherboard. In other cases you have to replace the jack with a new one. Using a multimeter, test if the power goes to the motherboard through the jack.

3. If replacing the AC power adapter and jack on the motherboard doesn't help, most likely you have a bad motherboard. Replace the motherboard.

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There is a cmos/ rtc battery but that would have nothing to do with powering on your laptop. Most likely there is an issue in the circuit at the DC power jack. If the connection seems loose, or moving the plug at the point where it connects to the computer gives a glimmer of power then it is the jack. The DC jack is usually soldered to the motherboard and requires some knowledge to repair. If the jack is okay then there is a problem further up in the power circuit on the motherboard which means trouble.

This is what you power jack looks like and yours is not soldered, but has a 4 pin connector that plugs in to the motherboard. Much easier to replace than a soldered connection. Click HERE to see it.

P.S. Just because there is a green light on the adapter it doesn't mean power is being distributed to the connector tip. You may want to try a different adapter before spending money to have it diagnosed.

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sorry to tell you this.

clb199@yahoo.com
pls rate me 4 stars

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