47LD920 (CHASSIS:LD01I) - LG TV Service Manual (repair manual). Page 15

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6. 3D function test
(Pattern Generator MSPG-3233, HDMI mode No. 371, Pattern
No. 81)
(1) Must input the signal(No.81) for 3D test like below. 
(2) After change to 3D mode, and then select side by side
format.
Can see like the below pattern, if you don’t put on the 3D
glasses.
(3) If you see the TV using by only the left side glass, If Can
see the Red on the center position like below
It’s OK.
(4) If you see the TV using by only the light side glass, If Can
see the Red on the center position like below
It’s OK.
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