Sony KD-55A9F - Page 20

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1.2 No Power u-com Failure
START
yes
Check POWER_ON
R827 or
P-on u-com #pin10 (IC800)
Is the voltage >3.0V?
Try AC Off and On after few minutes.
If #pin10 keep Low, change IC800.
If #pin10 goes High few seconds and downs to Low,
Check +12V_MAIN Line (from G board).
no
yes
Check 12V_MON
R818 Voltage.
Is the voltage >2.6V?
Check 12.7V_MAIN Line
(from G board).
Check “AC_OFF_DET_OUT”
(from DPJ CN5602 #25pin )
Check “AC_DET_IN”
(C801, CN800 #3pin on DPJ
from G board)
no
yes
yes
Change IC800
no
Check DC_OFF_DET
R821 or
P-on u-com #pin3 (IC800)
is >3.0V?
Check P_ON_#1
CL814 or
P-on u-com #pin12 (IC800)
is >3.0V?
Change IC800
no
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Check VDD
C815 Voltage.
Is the voltage >3.0V?
Check +3.3V_STBY Line (C805, CN800 #3pin)
no
Check TYPE_DET
R807 Voltage.
Is the voltage 2.6±0.2V?
no
yes
Check OPWRSB
R816
Voltage.
Is the voltage 0V?
SOC
Muffin 3 problem
IC1000 # AL14 OPWRSB
no
yes
Check PGOOD_1
R814 Voltage.
Is the voltage >3.0V?
1.3 No POWER - DDCON/LDO
Check 1.0V DDCONs
(IC608, IC609, IC610)
no
yes
Type Detection Circuit problem.
Check TYPE_DET Line (R829, R830, R831).
BM3 Board OLED Model
SYSSET
2018/09/1904:47:37(GMT+09:00)