Sony XBR-43X830C / XBR-49X830C / XBR-49X835C / XBR-49X837C / XBR-49X839C Service Manual ▷ View online
XBR-43X830C, 49X830C, 835C, 837C, 839C
89
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?
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 to No Power U-Com Failure)
No
Yes
Yes
3-2-3. NO POWER: DC_OFF_DET check
90
XBR-43X830C, 49X830C, 835C, 837C, 839C
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
91
XBR-43X830C, 49X830C, 835C, 837C, 839C
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
XBR-43X830C, 49X830C, 835C, 837C, 839C
92
TROUBLE SHOOTING
3-3-1. 2 Times Blinking (Main power Error)
3-3. STANDBY LED BLINKING
2-time blinking
Check +12V_REG
at pin 13/15/17 of CN9000
on B* Board,
Voltage > 13.2V ?
Yes
No
B* Board
G* Board
3-3-2. 3 Times Blinking (DC Alert)
BMFL/BMFW board
Go to Audio check point
AUDIO
Go to HDMI check point
HDMI
Go to Tuner check point
TUNER
3-time blinking
Check +5.0V_MAIN
at pin1 in IC8001, 4.959V
<Voltage<5.285V?
IC9014,etc
(B* Board)
DC_ALERT
NG
OK
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