Not starting I bought this TV as a refurbished item 4 years ago. It was working fine until recently. When I turn it on, the Vizio logo no longer shows and the screen stays lit (but black/purple in color) and the buttons don't work. I actually bought a new board (the one the power goes to) and it has the same problem. Is there anything else I can do?

SOURCE: Vizio GV42L LCD TV screen black when turn TV on first time

If you are using a set top box this might be caused by turnig the box on at the same tie as you turn the tv on or slightly after you turn the tv on.  If you are using compnent or HDMI inputs the set needs to see the signal as it is turned on to know what formt the signal is in. 

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SOURCE: vizio p42 type sp42a nov 2004 hd tv

The sp42a is a plasma tv not an lcd. check the psb voltages first then move onto the ymain and buffers.

SOURCE: MY 50 INCH VIZIO PLASMA TV HAS A GREEN AND PURPLE

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SOURCE: 47" vizio died

Very high failure rate on this brand. Even after repair, something else will fail. Cut your losses and buy a brand name set.

SOURCE: Vizio VX42L LCD TV died?

it is the power supply. in the given scenario like yours, the PSU is the suspect in 90% of the cases.

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