Question about Vizio SV470M LCD TV
I changed the channel and the screen turned white. i still have sound but no picture
It not the T-con board,u have broadcast signal came through but white screen.The Tuner board have a dead mosfat IC,but will not find this ic as indiviaully for the replacement.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish Tuner board for the replacement.
Posted on May 11, 2010
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Posted on Jan 02, 2017
SOURCE: while watching tv the screen
The main board is not working properly (I assume you know from the sound that the channel won't change). This may be the result of a failure in the board itself, or more likely, a bad output from the power supply. Check the power supply for bulging or leaking electrolytic capacitors such as those shown below:
Unless the capacitor is leaking, this is not a 100% test, but it's a good start. Sometimes a capacitor will fail with no externally visible evidence; you need an oscilloscope or at least a voltmeter to find these. A discolored plastic wrap on the capacitor indicates probable overheating, which is another sign of failure.
Sometimes a power supply will have a shorted diode, but this usually shuts down everything either by blowing a fuse or tripping fault protection circuitry in one of the voltage regulators.
Posted on Jun 06, 2011
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