50PX950-UA, 50PX950-UF (CHASSIS:PU02B) - LG TV Service Manual (repair manual). Page 74

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3D mode view error (no Depth , like 2D mode) Trouble Shooting
Change the 3D Glasses
Check 3D_Sync Line
-Main P704 4 pin
formatter R108
Y
N
Replace IR emitter B/D
Check  3D Emitter of Main – P704 1 pin : 5V
Check 3D Emitter of IR Assy – 1 pin : 5V
Y
N
Maybe FPGA has problems.
Replace it or 3D formatter B/D
Y
N
Replace 3D Glasses
Replace 3D Emitter Assy
N
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