About Format Aspect Switching - Panasonic PT-47WX52F Service Manual

About format aspect switching(WX 16:9 or HX 4:3)
Widescreen 16:9 and non-widescreen 4:3 PTVs use the same
light box, for this reason is important to set it to the correct
version (16:9 or 4:3). To change the format please refer to
figure 62 on page 43.
Be sure to select the correct format for the serviced PTV.
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Service Manual