Sony KD-55X9000C Service Manual ▷ View online
TROUBLE SHOOTING
3-2-2. NO POWER-U-Com Failure (2/2)
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A
Yes
Check P_ON_#2
P-on ucom #pin14
Is the voltage >3.0V?
Change IC9017
No
Yes
Check ORESETB
N
Check ORESETB
P-on ucom #pin12
Is the voltage >3.0V?
Change IC9017
No
Yes
Ch
IC9017
No
Check X_SYSTEM_RST
P
# i 16
Change IC9017
No
Yes
P-on ucom #pin16
Is the voltage >3.0V?
Change IC9017
No
If PANEL_PWER_ON (R9172) is 0V
Check XRST
Change IC9017
No
If BL_MUTE (R9174) is 0V
Check BL_ON
Change IC9017
Yes
P-on ucom #pin17
Is the voltage >3.0V?
END
Ucom IC9017 is working OK
Change IC9017
Yes
P-on ucom #pin18
Is the voltage >3.0V?
Ucom IC9017 is working OK
125
TROUBLE SHOOTING
3-2-4. NO POWER: DDCONs check
3-2-3. NO POWER: DC_OFF_DET check
START
Check Vdd
Change Fuse
No
START
Check fuse
F9xxx
Check Vdd
C9118
Is voltage >5V?
Change IC9018
Yes
No
END
g
Is fuse OK?
Check Vcc voltage
C9xxx
Is voltage >12 0V?
Check POWER_ON P-on ucom #pin19
(Refer 1.2 No Power U-Com Failure)
No
Yes
Check Enable pin
voltage
Is voltage >2.5V?
1.2 No Power U-Com Failure
No
Is voltage >12.0V?
(Refer 1.2 No Power U Com Failure)
Yes
g
Yes
Change DDCON IC
126
TROUBLE SHOOTING
3-2-5. NO POWER: DDCON check
Change D9000
No
START
Check Vcc voltage
C9061
Check
D9000
No
Check IC9403 Vcc voltage
C9428
No
g
Is voltage >3V?
Yes
Is diode ?
Yes
Check G board and harness
No
Check Vcc voltage
Check
No
Is voltage >12V?
Yes
Check Enable
No
Change D9001
No
C9061
Is voltage >4V?
Yes
D9001
Is diode ?
Yes
Check +5V_MAIN DDCON (IC9001)
Check Enable
IC9010 #pin1
Is voltage >2.5V?
Change IC9010
No
Yes
Change DDCON
IC9009
127
TROUBLE SHOOTING
3-2-6. NO POWER: LDOs check check
START
Check Vcc voltage
No
Yes
Check Enable pin
lt
1 2 N P
U C
F il
No
Check Vcc voltage
C9xxx
Is voltage >3V?
Check +3.3V_MAIN DDCON (IC9003)
No
Yes
voltage
Is voltage >3V?
1.2 No Power U-Com Failure
Yes
Change LDO IC
128