Sony KD-55S8005C Service Manual ▷ View online
KD-55/65S8505C, KD-55/65S8005C
TROUBLE SHOOTING
3-2-2. NO POWER-U-Com Failure (2/2)
A
Yes
Check P_ON_#2
P-on ucom #pin14
Is the voltage >3.0V?
Change IC9017
No
Yes
Check ORESETB
P-on ucom #pin12
Is the voltage >3.0V?
Change IC9017
No
Yes
Change IC9017
No
END
Ucom IC9017 is working OK
Yes
Check X_SYSTEM_RST
P-on ucom #pin16
Is the voltage >3.0V?
Change IC9017
No
Yes
If BL_MUTE (R9174) is 0V
Check BL_ON
P-on ucom #pin18
Is the voltage >3.0V?
Change IC9017
No
Yes
If PANEL_PWER_ON (R9172) is 0V
Check XRST
P-on ucom #pin17
Is the voltage >3.0V?
From previous page
93
KD-55/65S8505C, KD-55/65S8005C
TROUBLE SHOOTING
3-2-4. NO POWER: DDCONs check
START
Check Vdd
C9118
Is voltage >5V?
Change IC9018
Yes
No
END
Check Enable pin
voltage
Is voltage >2.5V?
1.2 No Power U-Com Failure
Change Fuse
No
No
START
Yes
Change DDCON IC
Check fuse
F9xxx
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
Yes
3-2-3. NO POWER: DC_OFF_DET check
94
KD-55/65S8505C, KD-55/65S8005C
TROUBLE SHOOTING
3-2-5. NO POWER: DDCON check
Check Enable
IC9010 #pin1
Is voltage >2.5V?
Change IC9010
Change D9000
No
No
START
Yes
Change DDCON
IC9009
Check Vcc voltage
C9061
Is voltage >3V?
Yes
Check
D9000
Is diode ?
No
Yes
Check G board and harness
Change D9001
No
Check Vcc voltage
C9061
Is voltage >4V?
Yes
Check
D9001
Is diode ?
No
Yes
Check +5V_MAIN DDCON (IC9001)
Check IC9403 Vcc voltage
C9428
Is voltage >12V?
No
Yes
95
KD-55/65S8505C, KD-55/65S8005C
TROUBLE SHOOTING
Check Enable pin
voltage
Is voltage >3V?
1.2 No Power U-Com Failure
No
START
Yes
Change LDO IC
Check Vcc voltage
C9xxx
Is voltage >3V?
Check +3.3V_MAIN DDCON (IC9003)
No
Yes
Yes
3-2-6. NO POWER: LDOs check check
96
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