Sony KD-49X8005C Service Manual ▷ View online
117
KD-49/55X8005C,XBR-55/65X800C,805C,807C,809C,810C
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
KD-49/55X8005C,XBR-55/65X800C,805C,807C,809C,810C
118
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
3-time blinking
Check +5.0V_MAIN
at pin1 in IC8001, 4.959V
<Voltage<5.285V?
IC9014,etc
(B* Board)
DC_ALERT
NG
OK
KD-49/55X8005C,XBR-55/65X800C,805C,807C,809C,810C
119
TROUBLE SHOOTING
3-3-3. 3 Times Blinking (Audio Error)
Audio Error ?
LED 3x blinking
See other flow
No
Yes
Go to page
Power Off Checking
*1
Go to page
Power off Checking
*2
Replace B-K Harness
OK ?
Yes
No
Replace K-PWB
OK ?
Replace B-PWB
OK ?
Yes
No
Yes
Segment “XS”?
Yes
No
B-K harness NG
K-PWB NG
B-PWB NG
KD-49/55X8005C,XBR-55/65X800C,805C,807C,809C,810C
120
TROUBLE SHOOTING
1) Power Off Checking*1
(1) K-PWB
PVDD-GND short ?
(See Note 2)
Power Off Check*1
Replace K-PWB
No
Measure the Speaker
impedance by multi-meter
Less than 3Ω ?
Yes
Confirm the speaker
harness
Cut or shorted
to the chassis ?
Replace Speaker
No
Yes
Replace Speaker Harness
No
Yes
Return to LED 3x blinking
or Power Off Checking*3
(2) K-PWB
LDO out short ?
(See Note 2)
(3) K-PWB
Fuse broken ?
(See Note 2)
No
Yes
No
Yes
Power Off Check*3
Segment “XS”?
(1) B-PWB
PVDD-GND short ?
(See Note 1)
Replace B-PWB
No
Yes
(2) B-PWB
LDO out short ?
(See Note 1)
(3) B-PWB
Fuse broken ?
(See Note 1)
No
Yes
No
Yes
Yes
No
(3) Fuse open check
Measure impedance of fuse F7700, F7702 5A (12.5V)
If fuse open → NG
(1) PVDD-GND short check
Measure impedance between PVDD and GND at C7706,
C7707.
If impedance is <100Ω → NG
(2) LDO out short check
Measure impedance between +3.3V and GND at C9130.
If impedance is <100Ω → NG
(3) Fuse open check
Measure impedance of fuse
F7702, F7704, F7705, F7701 5A (12.5V)
F7700 3.15A (DDC5V)
If fuse open → NG
(1) PVDD-GND short check
Measure impedance between PVDD and GND at C7722, C7762, C7782,
C7834.
If impedance is <100Ω → NG
(2) LDO out short check
(2) LDO out short check
Measure impedance between +3.3V and GND at
C7909.
If impedance is <100Ω → NG
Note 2:
Note 1:
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