Sony KD-55A9F Service Manual page 20

1.2 No Power u-com Failure
BM3 Board OLED Model
START
no
Check VDD
C815 Voltage.
Is the voltage >3.0V?
yes
no
Check TYPE_DET
R807 Voltage.
Is the voltage 2.6±0.2V?
yes
Check OPWRSB
no
R816
Voltage.
Is the voltage 0V?
yes
Check POWER_ON no
R827 or
P-on u-com #pin10 (IC800)
Is the voltage >3.0V?
yes
Check +3.3V_STBY Line (C805, CN800 #3pin)
Type Detection Circuit problem.
Check TYPE_DET Line (R829, R830, R831).
SOC
Muffin 3 problem
IC1000 # AL14 OPWRSB
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
Check 12V_MON
R818 Voltage.
Is the voltage >2.6V?
yes
Check DC_OFF_DET
no
R821 or
P-on u-com #pin3 (IC800)
is >3.0V?
yes
Check P_ON_#1
no
CL814 or
P-on u-com #pin12 (IC800)
is >3.0V?
yes
no
Check PGOOD_1
R814 Voltage.
Is the voltage >3.0V?
Continue next page...
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)
Change IC800
Change IC800
1.3 No POWER - DDCON/LDO
Check 1.0V DDCONs
(IC608, IC609, IC610)
20
SYS SET