Question about Vizio Televison & Video
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Posted on Jan 02, 2017
SOURCE: FLICKERING BACK LIGHT
Sounds like you have an LCD tv with backlight problems. Check power board for domed capacitors and replace them. next check connections on the inverter boards. they are on the sides or just one side. Becareful there is high voltage output from these boards. If the cable from inverter board is not good to the screen you can get a strobing. the inverter boards may need replaced. or cales to screen may be bad. The panel also could be bad.
Posted on Mar 25, 2010
you need to check first the power supply board whether the output supply 12-24vdc for the inverter board is stable and not flactuating..you can measure the output voltage with a multitester..you get a voltage output of 12-24 with the inverter board is connected or loaded to the system.be carefull of the high voltage at the inverter board..once the output is stable replace the inverter board or you can measure the output of the inverter be very carefull..the output range upto 500vac.be carefull..if the high voltage is stable replace the lamps...tnx and good luck..
Posted on Jun 03, 2010
Testimonial: "Thanks again. :)"
I unfortunately do not have a schematic for your set, but can give you some general information that may help.
Often these devices are either a VCR (voltage controlled resistor) or TCR (temperature controlled resistor) They are commonly used to "ramp up" power when the circuit is energized... in "old school" CRT sets, a common use was in the screen degaussing circuit. In LCD sets, they are most likely used to "fire up" the cold cathode discharge backlight tubes. They are indeed semiconductor devices and do not respond to digital meters... the input impedance is too high.You may get some sort of reading from an old Simpson 260 analog meter or something similar, but use caution because their operating voltage can damage semiconductor components. You would require a curve tracer to properly analyze the voltage ramp.
Posted on Jan 30, 2011
Hi, Yes unfortunately i know what it is. When repairing another make of hdtv one time, I used a different " BALLAST " for testing purposes-it was a little under powered to say the least-but i knew this-it allowed me to determine the bulbs were good. when the bulbs lit using my makeshift apparatus-HALF of the bulbs lit up lit up( dim on one side as well as some flickering! ) therefore you have a power supply that drives the backlights that is going "SOFT". Let FixYa know whatever else we can do to assist you. good luck. Prodzilla. P.S. there is a workaround you may try to give more life to this soft power supply, if able,go into menu and adjust brightness down a few notches until it evens out and stops flickering. Again good luck
Posted on Apr 02, 2011
SOURCE: I have a Digital Lifestyles
It can be bad power supply or backlight inverter board, or bad T-CON board, no way to tell unitl opening it up for details torubleshooting.
You can expect $150 and up for labor plus parts as needed, it will not be cheap!.
Basic troubleshooting guide here:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Posted on Jun 25, 2011
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