Question about Vizio VF550M 55 in. LCD HDTV
If you still have the audio, then it's probably a backlight or backlight inverter issue if the problem occurs on all sources and the onscreen menus. (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.
(shopjimmy.com has the backlight inverters: http://www.shopjimmy.com/catalogsearch/result/?q=VF550M . Make sure to find your part number first.)
Posted on Mar 21, 2011
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Jul 04, 2017 | TV Box Televison & Video
Oct 27, 2015 | Samsung Televison & Video
Apr 04, 2012 | Televison & Video
Dec 25, 2010 | RCA Televison & Video
Nov 29, 2009 | Toshiba 50H82 50" Rear Projection...
Aug 01, 2009 | RCA HD50LPW42 50" Rear Projection HDTV
May 25, 2009 | Sony KDF-E42A10 42 in. LCD Television
Oct 29, 2008 | Vizio GV42L 42 in. LCD Television
Aug 27, 2007 | Samsung SP-R4232 42 in. Plasma HDTV
Mar 23, 2007 | Samsung TXN2745FP 27" TV
Jun 13, 2014 | Vizio VF550M 55 in. LCD HDTV
Jun 13, 2014 | Vizio VF550M 55 in. LCD HDTV
631 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: