Repair Video: Faulty Power Supply on a Vizio SV420XVT1a LCD Flat Screen

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Okay here’s a really good video to help folks fix the power supply on a 42-inch Vizio LCD flat screen television (Model SV420XVT1a). Basically the problem becomes evident when you turn on the unit. You will see the Vizio insignia LED power indicator go up but see no images and screen will just be a complete blackout. The video gives a nice Macgyver tip on how to determine whether it’s just the backlight and/or the LCD screen that are/is out using a small flashlight.

Video teaches how you can repair the TV’s power supply module (part #0500-0405-0270) by replacing the bad components. You can of course opt to just replace the entire power supply but why do that when you can replace just a few parts, save some money and get the TV working again.

This video (which can be played in good quality HD) is intermediate level so be sure you know you can handle the safety aspects of the fix before going into it. Some soldering deftness is also needed because the components that you’ll need to work on are pretty small. You’ll need a multimeter for this repair.

Video will show you how to replace 5 problem parts: 1 pc. Field Effect Transistor (FET), 1 pc. FET driver IC and 3 resistors. Other tools you need includes a dental pick (to help you pry those tiny blown out resistors loose), some acetone and a small brush that you can use to clean the circuit boards (see video on how it’s used).

Related: How to find burnt resistor values by Jestine Yong

Video follows:

Thanks to norcal715 of Youtube for this repair video.

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Packing more pixels into those flat screens with 4K!

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The race to cram more pixels into those displays isn’t only limited to smart phones, tablets or computer screens as it has also benefited the ubiquitous television. If you think we’re stuck at HD (high-definition) then I guess you’ll be happy to know that we’ve actually moved on from that by what many considers a big leap in pixel count— about 4 times more pixels, to be more precise, compared to the standard 1080p HD television.

Comparison of the different resolution standards

Comparison of the different resolution standards


What is dubbed as 4k television, otherwise known as Ultra HD (UHD) flat screens with resolutions of 3840×2160 to 5120×3200 depending on the aspect ratio (HD resolution is just 1920×1080), has actually been around for a bit of time but I’ve not really paid much attention to them since they’re really still pretty expensive (the way LCD flat screens were when they were new in the market). However, the recent Consumer Electronics Show (CES 2014) has made developments in the 4k arena a bit harder to ignore with some cool demonstrations of head-turning TV displays that are reportedly bound for the consumer market— all of them packing some mean pixel firepower!

Take, for example, the stunning display of curves from Samsung and LG with their respective 105 in. curved screen TVs which they both claim are the world’s first. Both TVs sport Ultra HD pixel count levels with 21:9 ratio which makes it pretty wide indeed and will be a true centerpiece of any living space. These two same companies also showed prototypes of a TV screen that bends. Yep, bendable TVs may be in your living rooms sooner than you think, provided that you can afford them at their first mass market release.

Samsung's 105 in. curved TV (Image credit: TheVerge.com)

Samsung’s 105 in. curved TV (Image credit: TheVerge.com)


Another interesting development is the fact that companies are truly making them televisions smarter for a more interactive viewing experience by putting in more sophisticated operating systems (OS). LG showed off a new flat screen unit installed with a proprietary OS called WebOS (which they actually acquired from HP) which can make the TV access more than traditional TV shows as it can also show Internet content and can be used as a communication device as well (e.g. using Skype, etc.). Hisense also showed a TV installed with its own version of Google’s Android OS which isn’t really surprising as it isn’t the first non-smartphone device that got “Androidized” but is still, I think, a clever way to innovate more on the smart TV experience.

But the best news is yet to come as one of the best developments all in all is the price war trend developing among these top companies. Vizio beat them all to it by releasing the first sub-$1,000 unit which, incidentally, is also their very first offering on 4K! This is a 50-inch model which is indeed pretty surprising considering the current price levels of TVs of such size from the bigger brands (Samsung, Sony, etc.). While lower prices have been seen in smaller, relatively unknown brands, such trend creeping into the Samsung or Sony territory would be welcome development indeed.

Related article: 4K Ultra HD LED TVs Below $1,000

Electronics companies are obviously betting on the 4k as the wave of the future but is their bet well-founded? Is the market adopting? Reports indicate that it’s slowly doing so and that things are also slowly happening in other 4K-related devices as well. Some new set-top boxes are adopting 4K as well which bodes well for those wondering if 4K content will be supported well into the future.

Will you buy 4K anytime soon?

Also read: LCD vs. LED vs. OLED TVs: What’s the difference?

References:
http://www.ibtimes.co.uk/best-4k-tvs-ces-2014-1431723
http://www.theverge.com/2014/1/9/5291546/spec-sheet-tvs-ces-2014-curved-4k-flexible
http://www.eeweb.com

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Commonly Reported Vizio TV Problems

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vizio_logo_ratings_box_logoTechnology has no doubt come a long way over the years and continues to advance rapidly. Of course, it is far from perfect and there are a number of things that can go wrong with any given household appliance or gadget. There are some very impressive televisions on the market these days. Vizio, for example, offers an array of LCD, LED, and plasma models in all sizes. Any of these common Vizio TV problems may arise at any time throughout the life of the set.

Perhaps the most common complaint regarding Vizio TVs is the appearance of a blank black screen even when the set is switched on and the indicator light is glowing. The screen may still light up in some instances, but in either case the screen remains blank. This issue is usually corrected by replacing the power board, but there are several other things that could be the culprit, like the backlight converter, the T-con board, or even just a faulty screen itself. If a repair shop does not have all of the LCD TV parts that could possibly be causing the problem readily available, they may need to order them all in order to single out the guilty part, which can get rather pricey.

Faulty remotes are another common issue. This is one of the much easier and inexpensive Vizio TV problems to fix. Usually this is due to a bad IR sensor or a loose wire and the parts can generally be found online for less than 20 bucks. If the cause is unknown, just replacing the remote altogether is also fairly easy and of course less expensive than dealing with a problem with the TV itself.

Commonly reported Vizio TV problems also include sound-related issues. This may be a matter of faulty speakers or disconnected wires, which are both easily remedied. If it is an issue with the main unit, then it will be a little more difficult and expensive to fix.

There are many shops offering LCD TV repair services. Purchasing an extended warranty is usually advised to cover the cost of potential expensive repairs and replacements but you will need to rely on your judgment on whether the price of the extended warranty will truly be worth it (most of them are quite pricey).

Sources:
http://www.consumeraffairs.com/home_electronics/vizio.html
http://www.amazon.com/forum/vizio/Tx1D1GJG19EOP3Q

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