Sony KD-43X85K Service Manual page 19

TROUBLESHOOTING
1.2 No Power u-com Failure
START
Check VDD
no
C442 Voltage.
Is the voltage >3.0V?
yes
Check TYPE_DET
no
CL408 Voltage.
Is the voltage
2.6±0.2V?
yes
Check OPWRSB no
CL411 Voltage.
Is the voltage 0V?
yes
Check POWER_ON no
CL419 Voltage.
Is the voltage >3.0V?
yes
Check 3.3V_STBY Line
(C1708, CN1701 #9pin)
Type Detection Circuit problem.
Check TYPE_DET Line
(R445, R446).
SOC Muffin 5 problem
IC1000
# AP17 OPWRSB
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 G board).
Check 12V_MON
no
R462 Voltage.
Is the voltage >2.6V?
yes
Check DC_OFF_DET no
CL414 Voltage.
Is the voltage >3.0V?
yes
no
Check P_ON_#1
CL418 is >3.0V?
yes
no
Check PGOOD_1
CL413 Voltage.
Is the voltage >2.31V?
Continue next page...
Check 12.7V_MAIN Line
and 19.5V_12.7V_AUDIO Line
(from G board or LD board).
Change IC401
Change IC401
1.3 No POWER - DDCON/LDO
Check 0.8V_M5_CORE
DDCON (IC804)
19
SYS SET