Sony KD-49X8005C Service Manual page 113

3-2-2. NO POWER-U-Com Failure (1/2)
START
No
Check C9117 Voltage.
Is the voltage >3.0V?
Yes
No
Check R9186 Voltage.
Is the voltage >3.0V?
Yes
Check OPWRSB
No
R9179 Voltage.
Is the voltage 0V?
Yes
Check POWER_ON
No
P-on ucom #pin19
Is the voltage >3.0V?
yes
Check P_ON_LNB
No
P-on ucom #pin15
Is the voltage >3.0V?
Yes
KD-49/55X8005C,XBR-55/65X800C,805C,807C,809C,810C
Check +3.3V_STBY
R9144, CN9000 #26pin
Check DC_OFF_DET
IC9018
Check STBY_MHL
No
R9176 Voltage.
Is the voltage >3.0V?
Yes
No problem
TV set stays in
STBY MHL charge mode.
Try AC Off and On after few minutes.
If #pin19 keep Low, change IC9017.
If #pin19 goes High few seconds and downs to Low,
Check G board and harness.
Change IC9017
Check MAIN_VCC
R9175 Voltage.
Is the voltage >1.6V?
Check P_ON_VBUS
P-on ucom #pin11
is >3.0V?
SOC
Check P_ON_#1
Muffin
P-on ucom #pin13
problem
is >3.0V?
Check PGOOD_1
R9173 Voltage.
Is the voltage >3.0V?
A
To the next page
TROUBLE SHOOTING
No
Yes
No
Change IC9017
Yes
No
Change IC9017
Yes
No
No POWER - DDCON/LDO
Check 1.0V DDCON (IC9008)
G-Board
113