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856 Rear Camera2 fail - BMMI
I2C RearCamera2 Fail
1. Check
CON1301
2. Swap the module.
3. Compare the impedance of
any unusual net, demount the shielding of SoC and check
4. Before demounting the shielding, type in
/data/data/camera_status 1
V_REAR_2_1V05 (1.05V), V_2V8_CAM (2.8V), VREG_LVS1A_1P8(1.8V).
check
PU9508、PU9501
there is an unusual voltage.
5. If all power nets are normal, probe net impedance of
CAM_MCLK1_CON
6. If low impedance detected on net
any short circuits using X-ray; If open circuit detected, remount SoC. Remove
the SoC and probe the fault net from
work. The same net should short; if not, this should be PCB problem.
for SMT and ASSY issues (shift, solder skip, short, cracks).
CCI_I2C_SCL1, CCI_I2C_SDA1
with ADB connected and probe the power net
to find any cracks, short circuits, or wrong polarity if
and compare with normal PCBs.
cmd: adb shell
CAM2_RST_N, CAM_MCLK1_CON,
SoC
to
CON1301
with normal board. If
R9804,R9805.
Please
CAM2_RST_N,
check for
if remount SoC didn't
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