1. BB training for NKF
02,05, 2015

2. Function block (BB)

3. BB Component Placement- MB (Top)G

4. Power On Sequence

5. PMIC output

6. Sleep mode entrance sequence
CPU
PMIC
SLP_S0IX_B

7. Sleep mode exit sequence
CPU
PMIC
SLP_S0IX_B

8. BB issues 開機失敗 USB無法辨識 SD無法辨識 KEY 沒反應 前後相機無法開啟 TP不良 耳機或Speaker無聲
MIC無法錄音
G sensor test fail
未插charger,卻出現充電訊號
Slim port 顯示問題

9. Fail boot check Crystal Select “re-boot” Power on Small current no 電流
Current always keep on a value
Crystal
Select “re-boot”
Power on
Small current no
Display 電流
Entry
Recovery Mode
abnormal
yes
normal
Current always keep on a value
Big current
yes
1.Check IC
2.Check parts whether have short
Entry DNX Mode
Lack of parts
check no
CPU/BIOS/DDR/EMMC
checkFPC
check
CPU
normal
abnormal
Confirm LCD
Change or replace
replace

10. Example symptom: booting current 0.4A0.04A0.4A cycle
EMMC not be complete burnned
symptom: booting current 0.04A
0. 4Astop
CPU fail

11. Example
Symptom: current keep on 470mA during power off, PMIC have output，LCD can’t display，USB can’t detect
Root cause: U3500 ( BIOS) didn’t complete burned.

12. Example
Shielding cover didn’t assemble well，shielding cover was short with parts which will cause device can’t power on.

13. USB can not identify USB Fail Select “re-boot”
Check surface、pin and pad spot of J9400
Entry Recovery Mode
abnormal
normal
Replace J9400 or re-solder
abnormal
confirm USB Voltage
Confrim PMIC (U2003)
normal
fail
confirm USB switch
Confirm USB switch whether solder ok? Or IC is defective
pass
Confrim CS
Clock (R1029)
confirm CPU (U1000)
abnormal
normal
Confirm USB PHY (U9001)

14. USB schematics 1
USB Conn
USB Switch
U9001(USB PHY)
J9400
CPU

15. USB schematics 2
USB PHY
CPU
USB Switch

16. Example: can’t identify USB port
PMIC(U2003): Pin55,61 and PIN59,60 are short which cause the voltage “+VUSB_CONN_FUSE” to low then USB port can’t be identified.

17. Ex: charger does not insert, but appear charging icon or charge current is too big .
PMIC: Pin55,61與 PIN59,60短路

18. SD can’t be identified 1.Check the soldering of SD connector
2.measure the path of SD connector
3. Sd identification PIN(SDMMC3_CD_N) have action? With SD : GND ; without : High

19. KEY no response
Confirm KEY FPC
Measure all paths
PMIC
CPU
CPU

20. Front CCD can’t enable abnormal Re-assembly normal normal Defect CCD
Front CCD Fail
abnormal
assembly
Re-assembly
normal
normal
replace
Defect CCD
abnormal
Check whether was short
Check voltage(V1.8、V2.8)
abnormal
normal
check IMG version
Alston Chiu

21. Front CCD
B8012,B8013 location

22. Rear CCD can’t enable abnormal Re-assembly normal normal Defect CCD
Rear CCD Fail
abnormal
assembly
Re-assembly
normal
normal
replace
Defect CCD
abnormal
Check whether was short
Check voltage(V1.8、V2.8)
abnormal
normal
check IMG version
Alston Chiu

23. Rear CCD
注意B8010,B8011, B8014零件位置

24. TP fail
Check IMG version
Check FPC and Conn
Check all parts on TP FPC

25. Audio jack/speaker/microphone

26. Earphones was defective
Check Audio jack (J7001) 件
MIC
right
Audio switch
left

27. Earphones was defective
Check audio switch是否正常
Check UART_3_DEBUG_SW
Audio switch

28. Earphones was defective
Check U7001, R7014, R7015
Audio codec

29. Can’t identify Earphone
Check Audio jack
Check JACK_DET Check Audio codec (U7001)
JACK_DET
MODE
High
Speaker
Low
earphone
Audio codec (U7001)

30. EX: no sound during earphone record
Root cause: FB7010 was defective
Audio codec
(U7001)
Audio Jack (J7001)

31. EX: Right channel was no sound
原因: lack of FB7008，CR7004 was shift

32. EX: Right channel was no sound
UART_3_DEBUG_SW didn’t switch “Audio switch”
UART_3_DEBUG_SW
MODE
1.8V
Debug 0V
earphone
Audio switch

33. Speaker schematics Check all parts on path of right & left channels
Whether Speaker 、connector are defective?
Left channel
Right channel

34. EX: speaker no sound
Root cause: SH7001 was defective which casuse U and U have no electricity
Audio codec

35. MIC can’t record Check soldering . Measure whether was short
Whether MIC was defective ?
Microphone

36. G sensor fail EX: G sensor verify, X=0, Y= 1.3 ,Z=9.8 , Y was abnormal
X-ray check
reheat

37. Slim port display problem
1. Confirm U3100, X6202
2. Confirm the voltage of +V1P8A_slimport, +V3V3_slimport

38. Thank you for your attention