Question about Vizio Gallevia GV42LF 42 in. LCD Television

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Vizio gv47l black screen - Vizio Gallevia GV42LF 42 in. LCD Television

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  • Vizio Master
  • 8,617 Answers

The inverter is usually the cause if you have perfect audio but the screen is black. You can get inverter boards from www.tvcircuitboards.com

Posted on Jan 12, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: I CAN TURN THE POWER ON. THE SCREEN STAYS BLACK.

This TV has 2 main circuit boards (2 LCD backlight controlers): the Power Supply board may have fried the video board on it's way out ...
You can either arange to have the TV replaced under warenty if not have it serviced. In any case best of luck with Vizio support line.

Everyone bought this TV because it was so cheap... now we find out why: Vizio cuts corners on everything from engineering to support!! All brands are not created equal. Sometimes you get what you pay for.

Posted on Feb 25, 2009

eagle338
  • 4889 Answers

SOURCE: vizio gv47l lcd failed with loud popping sound and

What about sound? Do you have sound?

Posted on Nov 23, 2010

  • 5 Answers

SOURCE: my vizio gv47l went black. where do i start

Search on blown fuses for gv47l. There are three fuses that you can check (open the back of the TV) and if one is mad you can jumper it with another fuse. I did this nad it fixed my gv47l

Posted on Dec 31, 2010

  • 5163 Answers

SOURCE: My Vizio gv47l went black. I checked the power

Since this is an LCD TV, it's probably a backlight or backlight inverter issue if the problem occurs on all sources and the onscreen menus. If the audio can be heard, this is even more likely to be the cause. (The backlight itself usually fades or makes the on-screen image change to pink/red.) With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing. For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.) The scorch mark and smoke may indicate a resistor or zener diode that had been used as a fuse and is now gone.

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the inverter board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Separate the panel from the bezel. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. See http://www.lcdparts.net/howto/default.aspx for more information but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx. Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight.

I hope this helps.

Cindy Wells

Posted on Feb 25, 2011

  • 11800 Answers

SOURCE: Hi. My 47" Vizio GV47L

The amber light signals that the power source is in protected mode - the source is practically closed down by force and no longer delivers not even the stand-by voltage to minimally power the processor (hence the remote issue). This happens when one of the other boards in the tv is completely shorted.
Just 2 boards are capable of triggering that when they fail: the power source itself (one of its output transformers or rectifiers have failed) or the inverter/ballast boards (2 of them) - the ones that power the tubes that light up the screen.
To find out which you must disconnect the inverter boards and see if the tv starts up - if the tv starts and you can hear sound (and probably see an image if you light up the screen with a flash light) then the inverter board is faulty and you will have to replace it. If it doesn't then the power board is damaged and the inverter might have caused that - further testing on the components on both boards is needed to determine what caused it. A good experience in repairing electronics is required for that or you will replace boards blindly and hoping for the best
http://www.tvpartsguy.com/servlet/the-34/VIZIO-GV46L-INVERTER-Model%23/Detail
http://www.partstore.com/Part/Vizio/Vizio/GV47L/Vizio/Vizio/050005070260R/New.aspx

Posted on Apr 30, 2011

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This TV has 2 main circuit boards (2 LCD backlight controlers): the Power Supply board may have fried the video board on it's way out ...
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