Possible capacitor popped on tuner board.
Could be the T-Con board that needs replacing.
SOURCE: help - 15 mth old 42" edtv "plasma" black screen" have power and sound
I had the same problem....wasnt the main board but the two smaller boards...vizio changed them and no problem since .....
SOURCE: Vizio 42 in TV LCD HDTV white line across to of
That white line (usually jagged) is actuallly part of the transmitted picture. However, you are not intended to see it because it is located in what is known as the 5% overscan area. Your TVs today are more than just cable ready... they are a versital, technology filled multimedia display. You can see that line because the screen size or wide mode you are using is intended for 1080p/24 signals. You have 0% overscan with this screen size setting. This allows you to see ALL of the picture, including portions of the picture the broadcaster did not intend for you to see. You can change your screen size using the Wide feature in the Setup menu. See pg.62 of your user manual for details and descriptions of the various wide modes.
SOURCE: Anyone know what part number I need?
http://www.retrevo.com/support/Vizio-VW42LF-TVs-manual/id/23041dj599/t/2/
http://support.gateway.com/s/Manuals/HomeTheater/GTW-P42M102.pdf
http://www.my.electronicshelponline.com/Toshiba_Diagrams_39.html
Ok, use those service manual links to help you,
All info like that is in the Service manual, for exact make and model.
SOURCE: Vizio 42 LCD turns on but no picture or sound
32 in vizio turns on but but no picture only blue screen and cant turn channels up or down
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