Read Sony KD-55X9000C Service Manual online
TROUBLE SHOOTING
3-2-2. NO POWER-U-Com Failure (1/2)
START
Check MAIN_VCC
R9175 Voltage.
Is the voltage >1.6V?
G-Board
No
Check C9117 Voltage.
Is the voltage >3.0V?
Check +3.3V_STBY
R9144, CN9000 #26pin
No
Check R9186 Voltage.
Is the voltage >3.0V?
Check DC_OFF_DET
IC9018
No
Yes
Check P_ON_VBUS
P-on ucom #pin11
is >3.0V?
Change IC9017
No
Yes
Check OPWRSB
R9179 Voltage.
Is the voltage 0V?
Yes
No
Yes
Change IC9017
No
Check P_ON_#1
P-on ucom #pin13
is >3.0V?
Check STBY_MHL
R9176 Voltage.
Is the voltage >3.0V?
SOC
Muffin
problem
No
No problem
TV set stays in
STBY MHL charge mode.
Yes
Yes
Check PGOOD_1
R9173 Voltage.
Is the voltage >3.0V?
1.3 No POWER - DDCON/LDO
Check 1.0V DDCON (IC9008)
No
Yes
yes
Check POWER_ON
P-on ucom #pin19
Is the voltage >3.0V?
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.
If #pin19 keep Low, change IC9017.
If #pin19 goes High few seconds and downs to Low,
Check G board and harness.
No
A
Check P_ON_LNB
P-on ucom #pin15
Is the voltage >3.0V?
Change IC9017
No
Yes
To the next page
Yes
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