LG -V909DW Service Manual page 99

4. TROUBLE SHOOTING
4.13.2 Sub 5MCamera troubleshooting
5M sub camera control signals are generated by T(U101), and Power is supplied by LP8720(U503)
5M sub camera is used in case 3D stereo recording mode only
During still shot it will not working.
So you can check only when you are recording 3D.
Check same sequence with 5M main camera and check TP6(MIPI_B_CLK), TP7 (MIPI_B_DATA)
All the other things are same with 5M main camera trouble shooting sequence.
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