22
1.2 No Power U-Com Failure
P-on u-com control signal path summary
START
yes
Check POWER_ON
CL419
or
R470
Voltage.
Is the voltage >3.0V?
Try AC Off and On after few minutes.
If #pin10 keep Low, change IC401.
If #pin10 goes High few seconds and downs to
Low, Check 12.7V_MAIN Line (from Power board).
no
yes
Check 12V_MON
R462
Voltage.
Is the voltage >2.6V?
no
yes
yes
Change IC401
no
Check DC_OFF_DET
CL414
or
R465
Voltage.
Is the voltage >3.0V?
Check P_ON_#1
CL418
or
P-on u-com #pin12 (IC401)
is >3.0V?
Change IC401
no
Continue next page…
Check VDD
C442
Voltage.
Is the voltage >3.0V?
Check 3.3V_STBY Line (C1708, CN1700 #9pin)
no
Check TYPE_DET
CL408
or
R451
Voltage.
Is the voltage 2.6
±
0.2V?
no
yes
Check OPWRSB
CL411
or
R460
Voltage.
Is the voltage 0V?
SOC
Muffin 5 problem
IC1000 # AP17 OPWRSB
no
yes
Check PGOOD_1
CL413
or
R456
Voltage.
Is the voltage >3.0V?
1.3 No POWER - DDCON/LDO
Check 0.8V_M5_CORD DCON
(IC804)
no
yes
Type Detection Circuit problem.
Check TYPE_DET Line (R445, R446).
Check 12.7V_MAIN Line
and 12.7V_AUDIO Line
(from Power board).
Check “AC_OFF_DET_OUT”
(CL404 or CL5221 from IC5000)
Check “AC_DET_IN”
(JL1707, R1704 or CN1700 #16pin
from Power board)
T R O U B L E S H O O T I N G
SAFETY NOTES
SELF DIAGNOSTIC FUNCTION
TROUBLESHOOTING
SERVICE ADJUSTMENT
DIAGRAM
HANDLING GUIDE
22
SYS SET
2021/02/04 23:38:48 (GMT+09:00)