June 24th, 2009 No Comments »
In setting up their wireless connection for the first time, Im discovering many individuals having problems connecting through Network Manager or other GUI wireless connection tools. In fact my Network Manager is intermittently buggy, connecting sometimes and not others. This guide benefits all users in case the GUI tools are not working, and is useful for testing a wireless connection during initial installation of wireless drivers since it provides for good debugging output.
Unencrypted/ WEP / WPA connections will be covered in this guide
Pre-requisites
1. Properly installed network driver — This guide can be used to troubleshoot driver installation to see if it is properly functioning
2. The ESSID of your router must be broadcasted and not hidden
3. Knowlege of your wireless cards
driver (please see Prerequisite #4 to determine driver). Those using the r8187/r818x driver please see the end of the guide
4. Knowledge of your wireless card’s Interface Name – The user must know the proper interface of the wireless connection (wlan0, eth1, rausb1, etc). To discover this information, at command line type
lshw -C network
There may be multiple interfaces listed, however look under the section appropriate to your wireless device for the line labeled logical name. Here is an example
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May 17th, 2009 No Comments »
Troubleshooting a malfunctioning computer is a tricky task. A computer is made up of many components, and determining exactly which one is faulty is like searching for a needle in a haystack. Luckily, there are techniques that reduce the amount of hay you have to go through. This is the story of how I determined a faulty motherboard was the cause of my aunt’s computer problems.
When troubleshooting, two of the most important things to do is to maintain a logical attitude and to document. Without a logical attitude, you will become frustrated and overly repeat steps, thinking that if you try “just one more time” you will solve the problem. Logic dictates that if you have eliminated the impossible, whatever remains, however improbable, must be the truth. Therefore, trying the same thing more than a few times is useless. Without documentation, you will surely try a fruitless idea that you had already tried, and go around in circles. You will also be unable to reverse a mistake if you don’t know how you made that mistake in the first place. Thus, remember to document your results and maintain a logical attitude.
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Popularity: 1% [?]
April 18th, 2009 No Comments »
If you’re encountering problems with your computer or other programs after installing new software on your computer attempt to uninstall the program and see if the issues persist.
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April 11th, 2009 No Comments »
AC power adapter:
How the AC adapter works
The most common type of AC power adapter involves a small box, with one wire to go to the computer and another wire to go to the wall. There is usually an LED light on it, to tell you that it is on. (Is it lit on yours?) By the way, Apple notebook power adapters often have an LED that is actually built into the side of the computer, not into the adapter box, so obviously it won’t light up when it’s not connected to the computer. Continue reading »
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February 10th, 2009 No Comments »
This ATX power supply came in with the complaint of intermittent no power. When testing it with power on, I could see that the fan is not working. Not only that, some filter capacitors also became bulge because of the heat accumulated inside the power supply. The failure of the fan would not suck out the heat generated by the components especially the switch mode power transformer. If you switch off a working power supply and power removed, touch the power transformer, you could feel it is quite warm. Another heat source would be the heat sink where the output diodes attached to it. Diodes run a little bit hotter in filter circuit than diodes in other circuits due to the high current present at the secondary output line.
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Popularity: 4% [?]
February 10th, 2009 No Comments »
Viewsonic Monitor Problems-CRT or The Degaussing Circuit?
This Viewsonic 15” Monitor came in with the complaint of color problem in the whole display. Some techs called it as rainbow display while some referred to it as color patches fault. This problem usually were related to a bad picture tube (due to a fall that caused the internal shadow mask to come out from the original location) or from a faulty degaussing circuit. Continue reading »
Popularity: 3% [?]
February 10th, 2009 No Comments »
Monitor Color Problem-LG 710E Monitor With A Missing Blue Color
If you think that electronic repair is very difficult to learn then you have to read this article where only by using a solder gun could solve a Monitor problem. Of course there were many tough dog cases (very difficult to find out the fault) in electronic repair but at the same time there were also many cases that can be solve by some simple ways.
This LG 710E LG Monitor came in with no blue color problem. How do I know if the blue color was missing? Simply run a color test (that you may also download from the internet) or from a Monitor testing program generator, you could clearly see as which of the color is missing when you run the color bar test.
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Popularity: 3% [?]
February 10th, 2009 No Comments »
Dell 17″ (Likom L705XXX) Monitor With No Power Symptom
This DELL 17” Monitor (Made in Malaysia under LIKOM model L705XXX, product no: L7055LP) came in with no power symptom. Normally after opening up the cover I would look at the power supply (primary side) for any burnt and cracked components first. If there are darkened area and burnt components, I would tell myself that this Monitor needs a little more time to repair it. If it is not (component’s intact) I would usually begin to discharge the filter capacitor and start checking the fuse. Continue reading »
Popularity: 3% [?]
February 10th, 2009 No Comments »
Computer Monitor Display Problems Caused By A Defective Screen Grid Voltage (G2) Capacitor
Computer Monitor display problems such as no display with high voltage symptom can be caused by many reasons. A defective picture tube, a faulty video preamplifier IC, a missing heater voltage, torn signal cable, negative G1 voltage became too high (-120 volt and above), CRT board problems, a missing or low G2 voltage and etc could cause no display but with the present of high voltage.
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February 10th, 2009 No Comments »
All cathode ray tube monitor (crt) have a sticker sticked on its crt coating. Those words or characters printed on the sticker are the type number of the picture tube. All cathode rays tubes, whether a monochrome (black and white) or colour crt are identified by a specific code consisting of numbers and letters. The cathode ray tube monitors codes are different from each other because different picture tubes have different characteristics. Television codes are more or less the same as the monitor codes.
For instance, most color monitor cathode ray tube has the designation code such as the M36AFA63X03. There are six meaning (parts) M/36/AFA/63/X/03 in these codes as explain below: Continue reading »
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