Posts filed under ‘Computer Issues’

How to make voice calls on Samsung Galaxy Tab

The Samsung Galaxy Tab was launched in Nov 2010 and considered as the iPad killer. In general view, this product has many features which are more powerful than iPad. Although few reviews show that the Samsung tablet performance can not compare to iPad, it is worth the price for lighter weight, smaller size, Flash support, front and back cameras and external storage support (micro SD cards) . I think this tablet is the combination of iPhone 4, iPad and Amazon Kindle. One of the most important features attracted me is the ability of a cell phone. Oh NO! This was my biggest illusion because all US versions of Samsung Galaxy Tab currently don’t support the voice calling; only text message and internet access work. But it doesn’t mater since you’re not going to hold this beast up to your head. Anyway, for anyone who love to use it as a real phone, we still have few alternative ways to make the voice calls.

  1. Use Google Talk to make phone call (require wi-fi access)
  2. Use Skype to make phone call (require wi-fi access)
  3. Use other VoIP applications (require wi-fi access)
  4. Hack it to enable the voice calling function. One solution can be found here. I did not try this method so I am not sure if it works.
  5. Buy the European version of Samsung Galaxy Tab for the full voice calling function.
  6. Waiting ! Samsung may change their mind and enable this feature in their newer versions.

I don’t know why Samsung had to disable this feature on US versions but the carriers may earn more contracts because of that. Below are some hardware specifications of Samsung Galaxy Tab

  • Android 2.2 running TouchWiz 3.0
  • 7-inch TFT LCD with 1024 x 600 resolution (WSVGA)
  • Weighs 380 grams
  • 1GHz Cortex A8 processor
  • 16GB or 32GB internal storage
  • microSD expansion for up to 32GB additional storage
  • Front-facing 1.3 megapixel camera and rear 3 megapixel camera with flash
  • 4,000mAh battery
  • 3G data / voice (there’s a speakerphone and Bluetooth for phone calls, but no earpiece)
  • 5GHz dual-band 802.11n WiFi
  • Standard back color is white, carriers might offer different colors
  • Full HD video playback
  • There’s a 30-pin dock connector on the bottom that allows for HDMI, USB, and docking accessories (a car dock at least is planned)

A review of Samsung Galaxy Tab vs. Apple iPad

For anyone who want to use it as a small laptop, you can buy a tablet case with bluetooth keyboard. These accessories will cost you about $50.


February 9, 2011 at 11:18 am 2 comments

Find the country by ip address

You want to find which the country associates with a certain ip address ? Check out this link:

But if you want to have a service that looks for a country of any ip address (like the  one in above link), you many need a database of ip country codes. There are a lot of them available online and you can download for free. Then do the rest part with your code.

January 14, 2011 at 2:59 pm 2 comments

What should I do when my computer can’t turn on ?

Your computer or laptop  just stops working one day without a warning and you can’t turn it on by pressing power button. It must be very scared by the thinking of data lost or buying a new computer. However, this phenomenon doesn’t always mean that your love computer want to be retired. Sometimes, this situation is simply that your machine is taking a rest and all you have to do is waking him up. If your computer is still under warranty, you just need to bring him to vendor’s store for fixing. But if the warranty period  was over, let’s try these steps before you bring it to a professional repairing service or go to store for a new computer.

  1. Check out your power cord or power adapter to be sure it is working
  2. Unplug the power cord from the outlet to avoid any electric shock
  3. Open the computer case with a suitable screwdriver
  4. Remove one device (e.g. RAM or hard drive) inside the compute case and then install it back. Do this job very carefully to avoid any physical damage.
  5. Plug the power cord to the outlet
  6. Press the power button to see if the computer works
  7. If it works, congratulate you since the problem is fixed. You will need to unplug the power cord, close the case, plug the cord back to the outlet, turn the computer on and start to work  🙂
  8. If it does not work, retry steps 3 – 5 with another device or same device untill you feel that you give up 😦

The devices that I mentioned in this instructions include RAM, hard drives, optical drives, all PCI devices and all power supplies of the devices inside the computer case. If you are not familiar with those devices, my advise is asking for a professional help. After trying all devices with failure, there is possible that the mainbroad or a device goes wrong. This method works for me several times. You can apply these steps for laptop also and remember to handle with care because laptop devices are smaller and easier to get damage. Good luck.

December 5, 2010 at 11:13 pm Leave a comment

Fixing Dead Pixels and Gray Lines on the iPhone Screen

You love your iPhone so much and one day you noticed few dead pixels appearing on the screen. I can understand how frustrated you are, like me, to see them every startup. In fact, those dead pixels are not really dead in most cases. They are just stuck pixels that won’t refresh with screen redraw. There are number of methods to fix this issue.

  • The first method is using  Knox iPhone Pixel Fix application. This application uses JavaScript to cycle the colors by actual hex color at a frequency that may help to release the stuck pixels. If this method failed on your phone, let’s try the next one.
  • The second method is launching NES and playing a certain game for few minutes. The game will do the suitable screen refresh that can fix the stuck pixels and restore them to normal status.  This method sounds like working for many people. However, it requires your iPhone be jailbroken to use NES emulator. Learn more about this method here
  • The last method is using animated .gif to cycle various colors on stuck pixels. However, this way does not always work but it is worth a try.

In my case, the dead pixel automatically disappeared after few days and I didn’t have to do anything. So, waiting for those pixels restored is also a good way, right?

However, if your iPhone does not suffering from few dead pixels but a large gray areas instead, the solutions are totally different. These dead areas are usually caused by an accident drop, water damage or even cold weather (as many reports that I found on Google).

  • If you dropped your phone accidentally and the gray lines started appearing in the following days, the screen was physically damaged and you will need a new screen. This way will cost you a bunch of $$$ but it is still cheaper than buying a brand new phone. Apple store can do this service for a very high price ($199 perhaps). My suggestion is doing the screen replacement  project yourself.  You can buy replacement kit online for $30-$50 and follow the instructions of many clips on YouTube. This way has drawbacks like time consuming or phone damage by your careless operations.
  • If you spilled water on your phone unexpectedly, there is still a solution for this problem. Check out here for more details.
  • In case your phone screen popped up grey lines after a skiing trip, you may fix this problem by heating your phone at 30°C – 40°C for few days. As I know, there are at least one person applying this way successfully. However, I do not encourage to do that since there is risk of damaging the phone. Instead, I think why don’t wait for few days or few weeks for grey areas automatically go away (this may be just a wish). According to Apple’s website, the safe temperature of iPhone when it is in use is  0° and 35° C (32° to 95° F).

If all above methods don’t help to fix the problems with your phone screen, it may be the time to upgrade with new cute iPhone. However, I myself believe that the gray areas on iPhone screen in many cases are caused by a soft damage. Now, let’s look at the grey lines. They are growing sometimes and shrinking the other times. What happened? It looks more like an error of display buffer by the graphic program than a physical damage. This means that the dead areas in LCD can be fixed with a right software tool. Unluckily, I haven’t found a proof for my belief yet. I don’t know if there is a similar LCD damage of other devices. So, I expect anyone who has more experiences will share with me. 

Finally, you may need to take care your iPhone very carefully to avoid any unexpected issue. I found iPhone is the most sensitive phone that I ever had.  My old Samsung one stayed in the water pail and has been thrown up and down for many times by my 3 year old daughter but it is working like a charm now. Anyway, I love this Apple’s phone so much since it gave me a feeling of a real computer with all functions that I expected.

Share on Facebook

December 5, 2010 at 9:12 pm 4 comments

Recent Posts

/openmp AMD app fixing dead pixel iphone C++ cmd program CPU C sharp dead pixels directory download ibm synthetic data generator Dynamic Dynamic Memory Allocation Edit Environment Variables in Windows Environment Variables error lnk2019: unresolved external symbol _getprocessmemoryinfo@12 referenced in function error lnk2019: unresolved external symbol _ getprocessmemoryinfo@12 referenced in function "void __cdecl printmemoryinfo(unsigned long example code Fixing Dead Pixels and Gray Lines on the iPhone Screen Fixing Dead Pixels on the iPhone Screen Fixing Gray Lines on the iPhone Screen Fix iPhone getprocessmemoryinfo GPU Gray Line iPhone Screen gray lines gray pixels green pixels GUI how to "new" a two-dimension array in C++ how to use ibm quest synthetic data generator ibm data generator ibm quest data generator ibm quest data generator exe ibm quest data mining project ibm quest market-basket synthetic data generator ibm quest market basket market-basket synthetic data generator ibm quest synthetic data generator ibm quest synthetic data generator linux ibm synthetic data generator ibm synthetic generator Intel iPhone Iphone 3G iPhone 3GS iPhone 4 iphone gray lines on startup iphone pixel damage iPhone Screen iPhone screen damage Linux market-basket synthetic data generator Memory Allocation Multicore multithread multi thread multi threaded multithreading mysql extract data into file new OpenCL Path processor quest data generator quest synthetic data generator R SAS Set Environment Variables Set Environment Variables in Windows souce code source code stuck pixels system file two dimension array Windows 7 Windows Vista