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I2C RearCamera1 Fail
1. Check
CON1301
for SMT and ASSY issues (shift, solder skip, short, cracks).
2. Swap the module.
3. Compare the impedance of
CCI_I2C_SCL0, CCI_I2C_SDA0
with normal board. If
any unusual net, demount the shielding of SoC and check
R9802,R9803.
4. Before demounting the shielding, type in
cmd: adb shell
/data/data/camera_status 0
with ADB connected and probe the power net
V_REAR_1_1V05 (1.05V), V_2V8_CAM (2.8V), VREG_LVS1A_1P8(1.8V).
Please
check
PU9506、PU9501
to find any cracks, short circuits, or wrong polarity if
there is an unusual voltage.
5. If all power nets are normal, probe net impedance of
CAM1_RST_N,
CAM_MCLK0_CON
and compare with normal PCBs.
6. If low impedance detected on net
CAM1_RST_N, CAM_MCLK0_CON,
check for
any short circuits using X-ray; If open circuit detected, remount SoC. Remove
the SoC and probe the fault net from
SoC
to
CON1301
if remount SoC didn’t
work. The same net should short; if not, this should be PCB problem.
856 Rear Camera1 fail - BMMI