SOURCE: Vizio 42" 1080p HDTV LCD.
This is likely due to heat expansion (turned on) and contraction (turned off).
SOURCE: VIZIO TV MODEL L37 HDTV CODES FOR THE REMOTE
I found the codes online at DishTV
505,627,775,758,756,885,864
SOURCE: VIZIO LCD VX20L, intermittant video/audio with Blue screen message "No Signal"
If the tuner is bad, changing the mainboard should fix the problem.
SOURCE: My Vizio VX20L Flat HDMI TV shows
Tries change another HDMI cable,reset all HDMI setting to reset factory setting.
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.
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