Sony KDL-70W856B Service Manual ▷ View online
KDL-70W856B 5
SECTION 2 - TROUBLESHOOTING
TRIAGE CHART
Use this general Triage Chart to determine what may possibly be causing the error before going out to the customers location.
1. Confirm the symptom from the customer.
Red Dot: (Primary) Most likely defective part.
2. Select that symptom from the chart.
Blue Triangle: (Secondary) Possible defective part.
3. Bring the primary component listed for that symptom.
5. Chart Color Code.
No
Power
Remote
Audio
Smart
Core
2X 3X 4X 5X 6X 7X 8X 9X
No White
Power
LED
Steady
lines or
dots
No Video
One of
Inputs
No Video
All Inputs
No Remote
Wireless
can't
connect
Bluetooth
can't
connect
No Audio
No LED
MAIN BOARD
▲
▲ ▲
▲
▲
▲
▲
▲
▲
TUNER BOARD
▲
▲
▲
▲
POWER BOARD
▲
▲
▲
LCD PANEL
▲
▲
LVDS FFC
▲ ▲
▲
▲
H BOARD
SPEAKER
▲
LD BOARD
▲
BT BOARD
WIFI
Problem
POWER
AUDIO/
POWER
POWER
LD
TCON
BACK-
LIGHT
LIGHT
TEMP
SOFT-
WARE
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
Reference
Symptoms - Shutdown. Power LED blinking
red diagnostics sequences
Video
Network
*NOTE: REFER TO LCD PANELS SERVICE MANUAL IN REFERENCE LIBRARY DATABASE
FOR CORRECT REPLACEMENT PARTS BASED ON SERIAL NUMBER.
KDL-70W856B 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
HDMI 1 / MHL
SWITCH
UNIT
HFR
TCON
L
R
HEADPHONES
OUT
OPTICAL
AUDIO OUT
HDMI
SWITCH
EQ
ETHERNET
USB
HDMI 4
LVDS
AC IN
A/V
DECODER
VIDEO
PROCESS
LD
HDMI 2 /ARC
HDMI 3
USB
TUNER
AUDIO
AMP
TUNER
DEMODULATOR
ADC / DACAMP
MAIN BOARD
TUNER BOARD
LCD PANEL
LED BACKLIGHTS
LOCAL DIMMING
BAXL
USB
HUB
HUB
ETHER
PHY
AUDIO
AMP
POWER SUPPLY
BOARD
G2B
HUB
CAMERA
MIC
USB
WIFI
IR RX
LED’s
HIR
HSC2
SMART CORE
BT
SWITCH
UNIT
CABLE
ANTENNA
KDL-70W856B 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
POWER SUPPLY BOARD
LD BOARD
LD
G2B
MAIN BOARD
BAXL
12
30
GND
11
29
GND
3
28
BL_ERR
5
27
BL_ON
10
25
GND
9
24
GND
8
23
GND
7
22
GND
17
21
+19.5V(12V)
16
20
+19.5V(12V)
15
19
+19.5V_SS(12V)
14
18
+19.5V_HOLD(12V)
13
17
REG+12V
23
14
STBY+3.3V
27
12
AC_OFF_DET
28
11
POWER_ON
10
16
GND
9
15
GND
4
8
IP_REF
7
7
FB_REF
6
5
LD_PWM_3/SPI0_3(CLKF)
5
4
LD_PWM_2/SPI0_2(DATAF)
3
3
LD_PWM_1/SPI0_1(LATF)
2
2
LD_PWM_0/SPI0_0(EMIT IN)
NC
26
DIGITAL_STBY
NC
13
TCON_ON
NC
10
SA_MODE
NC
9
LD_STBY
NC
6
LD_PWR_4/SPI0_RDATA/BLU_TEMP
NC
1
LD_MODE_SW
GND
10
16
GND
9
15
FB_REF
7
7
LD_PWM_3
6
5
LD_PWM_2
5
4
IP_REF
4
8
LD_PWM_1
3
3
LD_PWD_0
2
2
LD_STDBY
8
NC
SA_MODE
1
NC
1
14
VLED_VCC
2
13
VLED_VCC
3
12
VLED_VCC
4
11
VLED_VCC
6
9
VLED_GND
7
8
VLED_GND
8
7
VLED_GND
9
6
VLED_GND
10
5
VLED_GND
11
4
LD_ERR
12
3
GL_CTRL
14
1
SET_12V
NC
10
NC
NC
2
NC
CN2002
CN2001
CN9101
CN6401
POWER_ON
28
11
STBY3.3V
23
14
REG12V
17
21
REG12V
16
20
REG12V
15
19
REG12V
14
18
REG12V
13
17
GND
12
30
GND
11
29
GND
10
25
GND
9
24
GND
8
23
GND
7
22
BL ON
5
27
BL_ERR
3
28
T-CON_ON
26
NC
NC
25
NC
GND
24
NC
GND
22
NC
GND
21
NC
T-CON_VCC12V
20
NC
T-CON_Vcc12V
19
NC
REG12V
18
NC
DIGITAL_STBY
6
NC
BLINKING
4
NC
PWM_DIMMER
2
NC
DC_DIMMER
1
NC
CN6601
VLED_VCC
1
14
VLED_VCC
2
13
VLED_VCC
3
12
VLED_VCC
4
11
VLED_GND
6
9
VLED_GND
7
8
VLED_GND
8
7
VLED_GND
9
6
SIGNAL_GND
10
5
LD_ERR
11
4
GL_CTRL
12
3
REG12V
14
1
NC
5
NC
NC
13
NC
AC_IN
1
AC-N
2
AC-L
AC_OFF_DET
27
12
CN6101
KDL-70W856B 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
Is Standby LED
blinking?
No
Yes
No
See Stanby
LED Blinking
Flowchart
Yes
Does red
Standby LED on
front panel light?
High (>2.5V)
on Pin 27 of CN6401
on Power Supply
Board?
Yes
No
Main Board*
Press power button while
monitoring Pin 28
of CN6401 on
Power Supply
Board.
High (3.3V)
appears
momentarily?
Yes
No
Power Supply
Board*
Power Supply
Board*
Power Supply
Board*
Remove AC power and
wait at least 30
seconds before
reapplying.
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 19
.
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