How To Troubleshoot And Repair DELL E151FP LCD Monitor With No Power Problem

The DELL E151FP LCD Monitor came in with no power symptom and upon opening up the cover I saw few components that were burnt. R623 (4.7 ohm) burnt at the side and you could still recognized the resistor color code. The current sense resistor (0.68 ohm) outer layer partly had came off and slightly burnt and the filter capacitor c605 (68uf 400v) one of the pins had became rusted and came off when I tried to desolder the pin.

This is not a new model and I believe lots of experienced techs had solved the problem. But for those who haven’t come across this problem, you may use the procedure to troubleshoot and repair any other type of LCD Monitor with power problem.

I will first remove the power transformer and make sure it rings okay with dick smith flyback tester. I do this first because I don’t want to waste my time checking other components and later only found out that the power transformer is the caused of the power problem. Once it rings okay I will measure all the secondary diode. For your information most LCD Monitor power supply widely used the dual schottky type diodes and the specification usually in the 10 to 20 amp with about 40 volts. However I do come across some designed are still uses the ultra fast recovery type diodes in the secondary section. Make sure you know how to check a normal diode and a schottky diode. Refer back to my website in the diode section and search for testing schottky diode article. I will then check for the ESR of electrolytic capacitors too.

Once I confirmed that the secondary side components are all tested okay, I would then proceed to remove all the components in the primary side. Some components in the primary side you can check on board like the bridge rectifier and fuse. If I’m new to the LCD Monitor model I would check all components off board (with a lead removed from board). With this way you will be sure that all components you have scanned through.

These are the components that I found defective; fuse-2A, R615-0.68 ohm, R613- 1K, R612-47 ohm, R623-4.7ohm, D604-1N4148, Q601-SSS6N60A, C605-68UF 400V and IC601-UC3842B. Total was nine components and it took me less than 20 minutes to check all the components in primary side. Now is the time to search for spare parts. After spending about 5 minutes in the spare part compartment I managed to find all components except the power fet SSS6N60A.

Though this part number is mostly used in switch mode power supply, my electronic supplier does not have this stock. I would then browse through the semiconductor databook to search for equivalent part number. From the book, it suggests to use the K1118 as replacement. After all components have put into their original place or location and of course with the power transformer soldered, I don’t immediately switch on the power supply. I would first use a 100watt light bulb connected in series with the live line. The best place to put the light bulb is the fuse holder area. Remove one of the fuse lead and connect the light bulb across it. Power it on and begin to observe the bulb. If it brightly lit and stay that way then there is still problem in the power supply. However, if the bulb doesn’t light at all then this is a good sign that the power supply may be working.

Use a multimeter to place at the secondary side with power on. If you get some accurate voltage reading from the outputs and the bulb doesn’t light at all, then this confirmed that the power supply is working. Switch off the power supply and connect back the fuse and turn the LCD Monitor on again. I’m very sure the LCD Monitor will now work.

Whether you are troubleshooting the DELL E151FP LCD Monitor or other brands, you can always use the procedure given above to repair the power supply problem. This method can be even use to repair other types of power supply too. No matter what types of power supply you are troubleshooting, just make sure you know how to check and test the basic electronic components. If you ever miss one, sad to say you would not be able to solve the problem or it might just take you many of your precious hours to complete the job. Happy hunting!

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Dell Inspiron Duo Touchscreen – Making the most out of your computer

Touchscreens have been around for quite some time. One of the earliest users of the touchscreen was the food service industry. No longer do cash registers have to be large pieces of equipment that have hundreds of dedicated keys. With a touch screen you can have as many keys as you could ever want that can be accessed with a press of a button. While the Dell Inspiron Duo touchscreen shouldn’t be used for commercial purposes (or at least, it isn’t meant to) it does make a great touchscreen laptop, or tablet, for practically anyone needing a touchscreen.

Firstly, the free Dell Duo is neither a laptop nor a touchscreen laptop. It is in fact a hybrid between a laptop and a netbook. Thanks to an innovative screen design that allows you to flip the screen around and rest it on top of the keyboard, this laptop can transform into a tablet in just seconds. This is great for a number of reasons. Firstly, laptops and tablets both have their pitfalls. Laptops are generally large and unsightly for presentations. They are great for doing work, however, such as typing up a report or editing a photo. Tablets aren’t so great at typing up reports or doing the work but they are extremely portable and perfect for anyone who needs a mobile presentation station.

The free Dell Duo is also a great fiscal choice for people to make. Laptops and tablets use the same type of computer technology. They all have ram, a hard drive and a processor. When you have a single unit that does both the tablets and netbooks job you’re able to save money because you only have to buy a single set of computer components. Instead of buying two separate 500 dollar units you can buy a single unit for 600. Saving money is a priority for many people especially with today’s economy and the free Dell Inspiron Duo is a great way to cut back on spending.

The technical specs are up to par and surpass many comparable netbooks and tablets. It houses a dual core processor that is rated at a clockspeed of 1.5 GHz. This is almost twice as fast as other netbooks. Most tablets have a single core processor that is rated at 1.0 GHz. The iPad is a perfect example of this. The Dell Duo free also has 2 gigs of ram which perfectly complement the speed of this particular processor. The screen is 720p and is 10 inches when measured diagonally. This is perfect because the pixel density on this screen is huge. Most 32 inch TVs have a pixel density a third of this screen. The more pixels per square inch, or pixel density, the better off you are. Each pixel is capable of representing a single color at any given point in time. The more pixels you have the better the screen looks.

 

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Dell Inspiron Duo Netbook / Tablet Laptop Consumer Review

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Once open, it is possible to spin this netbooks screen within its housing. Then, when it is closed again, with the screen facing upwards, users are left with a 10 inch touchscreen tablet computer.

This review will aim to find out whether or not this novel feature is integrated well, and whether or not it brings with it any limitations.

The Inspiron Duo is equipped with a dual core Atom N550 processor, as seen on many small netbooks. In addition, there is 2gb of memory, and a 320gb hard drive. This allows for comfortable performance at best, and leaves it a little sluggish at worst. Certainly the extra software requied to allow the laptop to be used as a tablet results in a slight worsening of performance when compared to netbooks running the same processor but without the extra feature.

The screen itself is 10.1 inches across with a resolution of 1366×768. This allows it to display high definition footage. While the display is quite crisp and bright, it too fails to wow and only sits in the acceptable category. This is a particular shame when you consider that the Duos main selling feature is the screen itself.

The laptop includes a 1.3 mega pixel web camera which is housed on the bezel for video chats. It does seem a shame though that when the computer is in tablet mode, the webcam is hidden within the housing.

Once in tablet mode, the screen can be used as a touch screen. On this model it is a capacitive touch screen meaning responsiveness is good. The glossy screen finish will result in fingerprints however, which may become tiresome once the device is back in netbook mode. Windows 7 is tricky to use with a touch screen as it isn’t really designed for such use. As a result, Dell have included a secondary layer of software called Stage, which provides large, easy to touch icons allowing for control over music, videos, photos, books, internet and games. Unfortunately, the Stage software runs rather slowly, and I feel many will manage without using it.

Another unfortunate criticism that we must level at the Dell Inspiron Duo is with regards to battery life. At approximately three hours, it is well beaten by most of the competition, with some netbooks offering up to nine hours on one charge.

In summary, the Dell Inspiron Duo offers the first glimpse into a possible future for tablet devices. It is fair to say that such a form factor, with some kind of retractable or hidden permanent keyboard, may catch on and prove popular. Unfortunately, prospective users may be forced to wait until the second generation of the device before purchasing to allow for some of the rough edges to be smoothed. It is also important that the user experience improves to become a little more slick and rewarding, rather than slow and frustrating.

Having said that, many will appreciate the novelty of this device, and it does have good features such as the tactile keyboard and of course, the rotating screen. Also, while it may be slightly underpowered for many users, those who are mainly just using the web will still have enough power there to keep them happy.

Dell Stop "Pre Installed" Ubuntu

ubuntuDell has decided to suspend sales of laptops and PCs using the Ubuntu operating system, one based on open source distro of Linux. Still, the company said sales would still make laptops and PCs using Ubuntu if there is a demand from its customers only.

Dell has been offering consumer select the system with Ubuntu pre-installed for more than two years. However, Dell decided to remove the Ubuntu machine from its online sales channel because it was considered more suitable platform for advanced users and computing enthusiasts. Thus, Dell’s online sales try to simplify and focus on its superior products.

This decision was a bit surprising because in the last month, Dell said that Ubuntu is more secure than the Microsoft Windows operating system and offers more protection when browsing the web. “Ubuntu is more secure than Windows, most viruses and spyware do not target Linux to be targeted in attacks that hackers do,” said Dell.

Linux has existed for almost 20 years and always favored because it is stable and reliable than Linux can also be modified according to the owner desires. Until now, Linux has been used in many computers, computers with sizes ranging from large to small sizes.