Sony KDL-46HX850 / KDL-55HX850 (serv.man2) Service Manual ▷ View online
KDL-46/55HX850(CH)
81
TROUBLE SHOOTING
3-3. NO POWER
No power
Check STBY_+3.3V
at 10 pin of CN6001
on the B* board
Harness
G* board
Replace the harness
between G* board and
B* board
B* board
NG
OK
NG
Symptom
improvement
improvement
Long AC off
(> 15 min.).
Power protection or
CPU abnormal stop
NG
OK
KDL-46/55HX850(CH)
82
1) 2 times blinking (Main Power Error)
TROUBLE SHOOTING
3-4. STANDBY LED BLINK
2 times blinking
Check REG+12V at
pins 3/5 of
CN6001 on
the B* Board
B* Board
Harness
G* Board
Replace
Between G* Board to
B* Board Harness
12V NG
12V OK
NG
Symptom
improvement
improvement
KDL-46/55HX850(CH)
83
TROUBLE SHOOTING
2) 3 times blinking (Main Board Error)
3 times blinking
Check D+1.2V at
JL6002
on the B* Board
F6001,IC6001,etc
(B* Board)
Speaker
Check +3.3V_MAIN
at JL6005 on
the B* Board
Check
Speaker Impedance
at SP Connector
F6003,IC6003,etc
(B* Board)
Check AUDIO+12.5V
at pin 2/4 of
CN6001 on
CN6001 on
the B* Board
G* Board
Check +12.5V
at F4601/4701 on
the B* Board
F4601/4701,IC4601/4701,etc
(B* Board)
Other B* Board’s parts
(Audio, Tuner, HDMI Eq...)
DC_ALERT
NG
OK
AUDIO
AUDIO
FE/BE Communication
NG
OK
NG
OK
NG
OK
NG
OK
KDL-46/55HX850(CH)
84
TROUBLE SHOOTING
3) 4 times blinking (LD Board Error)
4 time blinking
Check
BACKLIGHT_MON
at JL6017
on B* board
B* board
Between 0.84 V and 2.65 V
Below 0.84 V
Check the harness
between G* board
between G* board
and LD board.
G-LD harness
NG
OK
Light source
(Inside Panel module)
Change LD Board
LD board
Check the FFC connection
between LD board and
the light source
(inside the panel module).
LS FFC
connection
Change G* Board
G* board
Symptom
improvement
improvement
NG
Check the FFC connection
between Tcon board and
LD board.
Tcon-LD FFC
connection
Change Tcon Board
Tcon board
OK
OK
NG
NG
NG
NG
Symptom
improvement
improvement
Symptom
improvement
improvement
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