47LX9500-UA (CHASSIS:LA02R) - LG TV Service Manual (repair manual). Page 87

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9.(2) Trouble shooting – 3D Mode view error (no Depth, like 2D mode)
Change the 3D Glasses
ok
Check 3D_SYNC Line
- Main P7800 49pin
- Formatter P802 2pin
No
Check 3D Emitter of Main - P2401 1pin : 5V
Check Q906,7 of Formatter B/D
Maybe FPGA or FRC has problems.
Replace It or 3D Formatter B/D
No
Replace 3D Glasses
Check 3D Emitter of IR Assy – 1pin : 5V
Replace 3D Emitter Assy
ok
No
No
Replace Q906,7 of Formatter B/D
No
ok
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