Repair LCD Power Supply The Easy Way

Troubleshooting LCD monitor power supply pack is easier than the crt monitor power supply. It is small and compact and usually has only one output which is 12 volt and range from 2 ampere to over 4 ampere. Some designed have 18 and 24 volts also. Nowadays most LCD power supplies are build into the main board such as the Dell E151FP LCD Monitor while the older type were separated as power pack module.

42 Lcd Hdtv Vizio

The power pack module type is easy to diagnose because you can replace another working unit just to make sure is the power pack that giving problem. You may also use an external dc power supply to power up the LCD to confirm if the power pack is faulty. If you do not have the external dc power supply, you can always use this method to isolate the problem especially the symptoms are no power, low power and power blink. Using the rear light bulb (12 volt) from a car and connect it to the power pack output jack. If it light brightly then the power pack is okay. If it blink or dim the power pack have problem. Why have to use this method to test it? Because, if there are components shorted or leaky at the LCD main board, it will affect the power supply performance.

42 Lcd Hdtv Vizio

From experienced, most of the LCD power supply problems whether in the power pack or built into main board were due to the failure of electrolytic capacitors (most probably due to heat) in the primary and secondary section. Most of the capacitors have a high ESR which causes the power supply to produce low output, blink or no power at all. Typical value electrolytic capacitors in the primary side are 47 and 100 micro farad 50 Volt and the secondary sides are 1000 to 2200 micro farad 25 volt. Sometimes you can see the capacitor top casing became bulge and the sleeve that covered the capacitor casing turned into darker color like brownish.

The power section in some of the LCD screen are still using the UC3842 pulse width modulation (pwm) ic. This type of ic is quite easy to find in the market compare to some power ic which is very difficult to get. Samsung 153V LCD monitor is using the TOP247F power ic which is quite easy to troubleshoot if power fail in this model. Some power pack that came in only have minor burnt and after cleaning it and replaced the fuse, it will work as good as the new one.

Troubleshooting LCD power supply is not that difficult provided if you know how a power supply work. If you are unsure of how to troubleshoot power supply, I urge you to read all my power supply articles at the power supply page. I will continue to post more power supplies articles at that page and hope you could drop by more often to check out my website.

Repair LCD Power Supply The Easy Way
42 Lcd Hdtv Vizio

Black Friday VIZIO E421VL 42 Inch Class LCD HDTV 2011 Deals

Nov 17, 2011 11:43:27

Black Friday VIZIO E421VL 42 Inch Class LCD HDTV Deals
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VIZIO E421VL 42 Inch Class LCD HDTV

>> Click here to update Black Friday prices for VIZIO E421VL 42 Inch Class LCD HDTV <<

Black Friday VIZIO E421VL 42 Inch Class LCD HDTV Feature

  • 42-inch class (42.02 inches viewable) LCD HDTV with Full HD 1080p resolution
  • 120Hz refresh rate for more clarity during fast-motion video
  • Built-in ambient light sensor adjusts backlight levels based on surroundings
  • View full-screen slideshows of your JPG photos from connected USB devices
  • Three HDMI inputs for connecting your Full HD sources

Black Friday VIZIO E421VL 42 Inch Class LCD HDTV Overview

VIZIO's 42" Class LCD HDTV delivers 1080p Full HD picture quality and superior audio quality at an amazing value. This flat screen LCD HDTV features 120 Hz refresh rate, SRS TruVolume and SRS TruSurround HD audio for advanced virtual surround sound, 100,000 to 1 Dynamic Contrast Ratio delivering deeper black and brighter whites, and includes three HDMI. The 42" also exceeds ENERGY STAR 4.1Guidelines to reduce energy consumption and utilizes built-in ambient light sensing technology, which automatically adjusts backlight levels to the brightness of its surroundings.

Black Friday VIZIO E421VL 42 Inch Class LCD HDTV Specifications

April 2011
VIZIO's 42-inch class E421VL delivers 1080p Full HD picture quality, solid audio performance, and plenty of value. This flatscreen LCD HDTV boasts a 120 Hz refresh rate for fast-motion clarity, along with SRS audio technologies for virtual surround sound, a 100,000:1 Dynamic Contrast Ratio for deeper blacks and brighter whites, and three HDMI ports for connecting your HD sources. This display also exceeds ENERGY STAR 4.1 guidelines, and utilizes built-in ambient light sensing technology to adjust backlight levels according to the ambient lighting conditions, for a great picture in any room.

1080p Full HD picture quality, solid audio performance, and plenty of value.

120Hz Clarity and Full HD Entertainment

Optimal Viewing in Any Light

No matter your lighting arrangement, you'll always have the best picture possible thanks to built-in ambient light sensing technology. The E421VL automatically adjusts backlight levels based on its surroundings to optimize levels. The result is a balanced picture that will never appear washed out or too bright.

100,000:1 Dynamic Contrast Ratio

The E421VL delivers a Dynamic Contrast Ratio or 100,000:1, for deeper blacks and brighter whites no matter the programming.

120Hz refresh rate, for more clarity during fast-motion video.
VIZIO Ambient Light Sensor
Built-in ambient light sensing technology ensures you'll have a great picture in any lighting.
120Hz Refresh Rate

With a 120Hz refresh rate, the E421VL gives you more clarity during fast-motion video, for crisp, clear images and a great viewing experience.

Superior Surround Sound

This HDTV also delivers advanced audio, thanks to SRS technologies. SRS TruVolume limits volume inconsistencies between programming, saving you from those incredibly loud commercials or smoothing out that action film so you don't wake the neighbors. SRS TruSurroundHD delivers an immersive surround sound experience marked by clearer dialogue, and more precise bass and high frequency signals.

Three HDMI Ports

Three HDMI ports accommodate your home theater setup, Blu-ray Player, and HD cable or satellite TV, to deliver Full HD and 3D entertainment from multiple sources.

USB Photo Viewing

Enjoy viewing your JPG/JPEG photos on the big screen with the E421VL's USB port. Here's your chance for a fullscreen slideshow of that family vacation, complete with transition effects like dissolves and wipes.


VIZIO's ECO HD label means this HDTV exceeds the current ENERGY STAR Guidelines, saving you money on your utility bills while limiting your carbon footprint.

E421VL Select Specifications

Display Size (Diagonal):42-Inch Class (42.02 Inches Viewable)
Backlight Type:CCFL
Dynamic Contrast Ratio:100,000:1
Refresh Rate:120Hz
Response Time:5 ms
Viewable Angle (Horizontal/Vertical):178 Degrees
Channels/Speaker Output:2 x 10W
HDMI with HDCP:2 Rear, 1 Side
Component Video (YCrCB):1 Rear
Composite Video:1 Rear
RF Connector for Internal Tuner:1 Rear
Computer RGB:1 Rear
Stereo Audio Input (RCA):1 Rear
USB 2.0:1 Side
Optical Digital Out (SPDIF):1
Analog Audio Out (RCA):1
With Stand:32.85 lbs.
Without Stand:31.09 lbs.
With Stand:40.26 x 27.48 x 8.99 Inches (W x H x D)
Without Stand:40.26 x 25.91 x 3.51 Inches (W x H x D)

What's in the Box

Vizio E421VL 42-Inch 1080p LCD HDTV, Remote Control With Batteries, Power Cable, Detachable Base With Thumbscrews, User Manual, Quick Setup Guide, Registration Card

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VIZIO E421VL 42 Inch Class LCD HDTV

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