There is two types of transformers in the market- linear transformer and switch mode power transformer. The transformers invent is different. Sometimes it is just referred as ac transformer. Linear transformer mostly used in radio, task kits, Vcd and etc while switch mode transformer can be found in Monitor, Tv, Fax and so on.
A transformer consists of two or more coils wound on the same core. For power transformers, the core material is commonly iron. For a radio-frequency transformer, the core material is commonly ferrite or air. The basic property of a transformer is to change Ac voltage. A transformer cannot change direct current voltage. A step down transformer has a lower Ac production voltage at its secondary winding than the Ac input voltage to its primary winding. Conversely, a step up transformer has a higher secondary than primary voltage. The transformer laminations or coating of shellac, enamel or varnish is to insulate adjacent turns from shorts in the middle of winding. I will not go too details about how transformer work and transformer calculation as you can read more details from most electrical and electronic transformers books.
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How to test transformers: Transformer failures are relatively rare in most electronic equipment, compared with other components. If too much current goes straight through a coil or winding, the winding heats up and can whether open up completely, or the insulation in the middle of turns of wire can break down, causing the coil to be partly or completely shorted.
Samsung UN46D7000 46-Inch 1080p 240 Hz 3D LED HDTV (Silver) Best
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Samsung UN46D7000 46-Inch 1080p 240 Hz 3D LED HDTV (Silver) Feature
- 3D glasses not included in box, must be purchased as optional accessory
- Samsung Smart 3D HDTV. QWERTY Remote Control.
- 1080p Resolution
- Internet Connectable (WiFi Built-in). Smart TV with web connected applications and web browser
- Micro Dimming Technology shows detailed contrast across the screen with richer, brighter colors, whiter whites and deeper blacks.
Samsung UN46D7000 46-Inch 1080p 240 Hz 3D LED HDTV (Silver) Overview
Finally, entertainment and communication go hand in hand. The future of TV connectivity is calling, and the 46-inch Samsung UN46D7000 LED TV is the answer – with the power of Wi-Fi and Skype built right into the set. Making video calls in real time is a breeze, and both audio and video qualities are crystal-clear. Samsung widens your view of what a TV can do, with advanced online connectivity known as Smart TV – enhanced web access and a wide range of apps. To top it all off, Samsung 3D technology immerses you in another world with a depth and clarity from 3D movies titles and TV programming that you have to see to believe. It's all wrapped up in an ultra slim Samsung One Design .5" inch bezel, for a “more screen" appearance.Samsung UN46D7000 46-Inch 1080p 240 Hz 3D LED HDTV (Silver) Specifications
3D Technology Checklist
This product is 3D-related. To help you get a great 3D experience, use the checklist below to ensure you have everything you need. 3D viewing requires:
 | A Display First, you'll need a 3D-ready display--whether it's a 3D HDTV, 3D projector, or 3D computer monitor. These displays have more processing power than standard 2D models for displaying 3D images in rapid succession. |
 | A Source Your display may be ready for 3D playback, but you'll still need a device to read 3D content. This can be a cable box with a subscription to a 3D channel, a 3D Blu-ray Disc player, or a PlayStation 3 system. |
 | 3D Content 3D content--the actual entertainment, in other words--will be played back using the source mentioned above, whether it's a 3D broadcast from your cable provider, a 3D Blu-ray Disc, or a 3D video game. |
 | 3D Glasses For now, the vast majority of 3D HDTVs require glasses for 3D viewing. Many use powered "active shutter" glasses, others polarized "passive" glasses. You'll need one pair per viewer, and they'll have to be compatible with your display, whether they're the same brand, or a pair of "universal" glasses designed to work across brands. |
 | HDMI Cable To connect your source (such as a 3D Blu-ray Disc player) to your display, you'll need a high-speed HDMI cable. Cables with this designation feature bandwidth speeds up to 10.2 Gbps (gigabits per second), for carrying the 3D signal without any loss of quality. |
If you want to get more information about 3D, shop our 3D products, watch videos, or interact with other customers, we invite you to visit 3D 101, our customer center about everything 3D. | |
Internet-Ready Devices
Internet-ready devices use your broadband connection to deliver dynamic content to your television, whether it's streaming video from Netflix, new music from Pandora, or a quick glance at today's weather forecast.
Although there is overlap, each manufacturer offers a unique bundle of free or paid services, including streaming video and music, social networking apps, online photo galleries, news and financial updates, weather info, sports scores, and a variety of other smartphone-like applications.
Manufacturers continue to add new content to their offerings, keeping customers current through firmware updates, and making a bit of research a prudent step in your buying decision.
Learn more about Internet-ready devices and HDTVs, how they work, what services are offered by different manufacturers, and exactly what you'll need to get started at our Internet TV 101 customer center.
February 2011
For the ultimate TV enthusiasts, incredible picture quality and advanced connectivity are just the first step; the Samsung UN46D7000LED TV goes a step beyond, adding elegant design to the formula. The Samsung "One Design" bezel is only 0.2 inches--as slender as they come--for a picture that's, well, all picture. On that commanding 46-inch screen you can enjoy Samsung' Smart TV, which puts the web, a wide range of apps, Skype video calling, and plenty more at your fingertips. Or connect a Blu-ray 3D player to get immersed in cinema-quality 3D programming--3D glasses not included in box, must be purchased as optional accessory.
More Screen, Less Frame
Auto Motion Plus 240Hz
There's a big difference between seeing the game and seeing every split second of it. That's where Auto Motion Plus 240Hz technology comes in. All the action in every frame is analyzed and then adjusted so nothing goes by in a blur. From quarterbacks to cyber warrior, the action is always smooth, sharp and fluid.
1080p Full HD With Four HDMI Inputs
The UN46D7000 delivers Full HD 1080p resolution, for a superb level of detail and clarity in your picture. To connect your sources, four HDMI inputs are provided, for delivering a Full HD picture and audio over a single cable.
Samsung's "One Design"
The first thing you notice about the LED D7000 series is its barely visible 0.2-inch brushed metal bezel, a fine line that subtly frames the rich content on the screen and enhances the TV's light form factor. It rests on an improved Quad Stand, with minimalist visual appeal to fit in any viewing environment.
3D in HD
Enter a new dimension in TV and Home Entertainment with Samsung 3D TV. Experience cinematic-quality 3D entertainment in the comfort of your living room. Samsung 3D is a truly immersive viewing experience, with the power to fill your room with images you can almost touch. Connect to a Blu-ray 3D Player to play 3D titles or intensify your viewing experience by upconverting regular 2D content to immersive 3D.
Smart TV with Samsung Apps
Connect with Samsung Smart TV for a wealth of added entertainment options. The UN46D7000 features Samsung's Smart Hub, a simple menu system for connected features. Easily search for movies, shows and videos via online services and across connected devices, browse the web from your television, chat with friends, and access a wide variety of apps from Samsung Apps.
Samsung Apps is a growing collection of apps specifically built for your TV, connecting you to your favorite digital content like videos, sports, games, social networking, and much more. With web-connected apps on your Samsung Smart TV, you can stream movies from Netflix or Blockbuster, TV shows from Hulu, videos from YouTube, Next Level sports information from ESPN, music from, Pandora and view updates on your Facebook or Twitter accounts. The apps that matter to you, now available on your TV.
Also included with the UN46D7000 is a QWERTY Remote Control for easy typing of search terms, Twitter updates, etc.
Skype on Samsung TV
Enjoy the convenience and connectivity of free, IP-based, picture-in-picture video calls via Skype, right from your couch. Skype is nice on a 15-inch laptop, but it's a whole new experience on a display this size.
Built-in WiFi
Access all your Smart TV features or DLNA network content without the need for a wired connection or add-on device. The UN46D7000 has Wi-Fi connectivity right out of the box.
ConnectShare Movie
Connect a thumb drive or digital camera quickly and easily via one of the UN46D7000's USB ports. An intuitive, user-friendly interface allows access to videos, music, or pictures via the remote.
AllShare DLNA Networking
For even more entertainment options, the UN46D7000 lets you connect to your home network and stream music, videos, and photos from other DLNA Certified devices (your computer, network storage drive, etc.).
Ultra Clear Panel
Absorbing ambient light, Samsung's Ultra Clear Panel eliminates reflections, boosts contrast ratio, and creates a comfortable viewing environment. Enjoy crisp image details, natural skin tones, excellent shadow detail, and vibrant colors.
UN46D7000 Select Specifications
| Video | |
|---|---|
| Screen Size: | 45.6 Inches |
| Display Type: | LED With Micro Dimming Plus |
| Resolution: | 1080p Full HD |
| Inputs | |
| HDMI: | 4 (version 1.4) |
| Component Video (Y/PB/PR): | 1 |
| Composite Video | 2 (1 Shared With Componenent) |
| PC Input: | 1 |
| USB 2.0 Ports: | 3 |
| Component Audio Input: | 1 |
| PC Audio Input: | 1 |
| Outputs | |
| Digital Audio Output: | 1 |
| Weight and Dimensions | |
| Dimensions (WxHxD): | 41.3 x 24.0 x 1.2 Inches (41.3 x 27.0 x 10.9 Inches With Stand) |
| Weight: | 27.6 lbs. (31.7 lbs. with stand) |
What's in the Box
UN46D7000 46-Inch Class (45.9 Inches Diagonal) LED HDTV, Stand, Remote Control, Documentation, AV/Component Adapter, AV Adapter
Samsung 2011 LED/LCD Feature Comparison
| Series | D8000 | D7900 | D7000 | D6500 | D6400 | D6300 | D6000 | D5500 | D5003 | D5010 | D5000 | D4003 | D4000 | D630 | D550 | D450 | D403 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Screen Sizes | 46", 55", 60", 65" | 46", 55" | 46", 55", 60" | 40", 46", 55", 60" | 40", 46", 55", 60" | 40", 46", 55" | 32", 40", 46", 55", 60" | 32", 40" | 22", 40" | 22" | 22" | 19", 26", 32" | 19", 32" | 40", 46" | 32", 37", 40", 46" | 22", 26", 32" | 32" |
| Full HD 1080p |  | | | | | | | | | | | | | ||||
| 240Hz | | | | ||||||||||||||
| 120Hz | | | | | | ||||||||||||
| 3D | | | | | | ||||||||||||
| Samsung Apps | | | | | | | | ||||||||||
| Your Video | | | | | | | | ||||||||||
| Search All | | | | | | | | ||||||||||
| Web Browser | | | | | |||||||||||||
| Skype | | | | | |||||||||||||
| HDMI Inputs | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 2 | 2 | 2 | 2 | 4* | 4 | 4 | 2** | 2 |
| USB Ports | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 |
| WiFi Built-In | | | | | |||||||||||||
| Micro Dimming | Micro Dimming Plus | Micro Dimming Plus | | ||||||||||||||
| Allshare | | | | | | | | | | | |||||||
| Qwerty Remote Included | | | | ||||||||||||||
| 3D Glasses Included | | ||||||||||||||||
| Design | One | One | One | One | One | ToC | ToC | ToC | High Glossy Black | ToC | ToC | High Glossy Black | ToC | ToC | ToC | ToC | High Glossy Black |
| Bezel Type | Ultra Thin | Ultra Thin | Ultra Thin | Ultra Thin | Ultra Thin |
* 19" has 2 HDMI inputs
** 19" and 22" have only 1 HDMI input
Customer Reviews
*** Product Information and Prices Stored: Jan 23, 2012 18:48:44
Just like a coil, you can check continuity of any primary or secondary transformer winding. The actual value of Dc resistance you read is rather meaningless, but at least you will know whether a winding is open. Checking linear transformer is quite right forward. Apply the ac voltage to the primary winding and expect production voltage at the secondary side. No or low production voltage means the transformer winding has open or shorted winding. Look for any evidence of overheating, such as darkened or blackened areas or a burnt smell.
About how to test a power transformer-it is a dinky bit complicated. You cannot apply ac voltage to the equipment and expect the desire production at the secondary side without associate to load otherwise over voltage will happen (because you have removed all the secondary load) and will blow the power section which consist of power fet, pwm ic and etc. Switch mode power furnish are designed to run with load while linear transformer can be test without load.
The best way to test a switch mode power transformer is first remove it from the board. Check only the primary winding as secondary winding failures are exceedingly rare. How do we know which one is the primary winding? Trace from the big filter cap the unavoidable pin to see where the circuit goes. It will go to one of the pin of the transformer. Then look for the power fet middle pin which is the Drain and it will lead to another pin of the transformer. This two pins is the primary winding of the transformer. Checking the resistance of the primary winding only can quote whether it is open but it cannot check if it has industrialized a shorted winding. Only by using a ringer test you will know if it shorted or not. A shorted turn in the primary winding can cause the power section to blow.
The cheapest ringer tester that i came over is Dick Smith Lopt Meter or flyback tester. Just associate the probes to the primary winding and the follow are at once seen from the Led bar graph. 4-8 bar relate a good winding, 1-2 bar relate partial short and if the led goes off means there is a heavy short in the winding. Also checking the transformer it can be use to check B+ Coil, horizontal yoke coil and flyback primary winding and ballast (choke).
The expensive ringer tester is from sencore equipment. Sencore Lc102 and Lc103C Also checking capacitor it also have the potential to check all kind of winding. whether it is a low voltage transformer, high voltage transformer, current transformer, pulse transformer, electric transformer, custom transformer this equipment will be able to check and test it.
If you do not wish to spend on this tester you may use a light bulb to check it. remove one of the primary winding pin and associate a 60 watt light bulb. One end to the circuit while the other to the transformer pin. If the bulb light and didn't goes off infer a shorted winding and if the light goes off, the winding is ok.
Transformer repair is not easy and it want a good skill to do it. Most of the transformer repairer favorite to rewind bigger winding such as fan, car alternator and starter. Switch mode power transformer is a dinky bit difficult to rewind because of the small size and low price.
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