Sony XR-65X95K Service Manual page 21

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 or R451 Voltage.
Is the voltage 2.6±0.2V?
yes
Check OPWRSB
no
CL411 or R460 Voltage.
Is the voltage 0V?
yes
Check POWER_ON
no
CL419 or R470 Voltage.
Is the voltage >3.0V?
yes
Check 3.3V_STBY Line
(C1708, CN1700 #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 or R465 Voltage.
Is the voltage >3.0V?
yes
Check P_ON_#1
no
CL418 or
P-on u-com #pin12 (IC401)
is >3.0V?
yes
Check PGOOD_1
no
CL413 or R456 Voltage.
Is the voltage >3.0V?
Continue next page...
Check 12.7V_MAIN Line
and 12.7V_24V_AUDIO Line
(from G-board).
Change IC401
Change IC401
1.3 No POWER –
DDCON/LDO
Check 0.8V_M5_CORE
DDCON (IC804)
21
SYS SET