Sony KDL-42W805B Service Manual ▷ View online
KDL-42W805B 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
▲
▲
▲
▲
LCD PANEL
▲
▲
TCON
▲
▲
▲
▲
HIR BOARD
▲
HSC2 BOARD
▲
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
*NOTE: REFER TO LCD PANELS SERVICE MANUAL IN REFERENCE LIBRARY DATABASE FOR
CORRECT REPLACEMENT PARTS BASED ON SERIAL NUMBER.
CORRECT REPLACEMENT PARTS BASED ON SERIAL NUMBER.
Symptoms - Shutdown. Power LED blinking
red diagnostics sequences
Video
Network
KDL-42W805B 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
BAX
USB
HUB
HUB
ETHER
PHY
AUDIO
AMP
AC ADAPTER
WIFI
IR RX
LED’s
HIR
HSC2
SMART CORE
BT
SWITCH
UNIT
CABLE
ANTENNA
KDL-42W805B 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
CN2001
CN9101
+19.5V(12V)
30
21
29
30
GND
GND
29
30
25
29
GND
+19.5V(12V)
28
20
17
28
BL_ERR
+19.5V_HOLD(12V)
27
18
23
25
GND
GND
25
29
21
24
GND
+19.5V_SS(12V)
24
19
19
23
GND
GND
23
25
11
22
GND
GND
21
24
30
21
+19.5V(12V)
REG+12V
20
17
28
20
+19.5V(12V)
GND
19
23
24
19
+19.5V_SS(12V)
BL_ERR
17
28
27
18
+19.5V_HOLD(12V)
POWER_ON
16
11
20
17
REG+12V
AC_OFF_DET
15
12
1
16
GND
LD_MODE_SW
14
1
2
15
GND
STBY+3.3V
12
14
12
14
STBY+3.3V
GND
11
22
15
12
AC_OFF_DET
PWM_3
9
5
16
11
POWER_ON
IP_REF
8
8
4
9
LD_STBY
PWM_2
7
4
8
8
IP_REF
FB_REF
6
7
6
7
FB_REF
PWM_1
5
3
9
5
LD_PWM_3
LD_STBY
4
9
7
4
LD_PWM_2
PWM_0
3
2
5
3
LD_PWM_1
GND
2
15
3
2
LD_PWM_0
GND
1
16
14
1
LD_MODE_SW
LD
DC IN
MAIN BOARD
BAX
PANEL
MODULE
AC_IN
1
DC-IN
2
DC_GND
LD BOARD
KDL-42W805B 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
Yes
No
See: Standby
LED Blinking
flowchart
Does TV turn ON?
Is red light blinking
on front of TV?
Yes
No
AC Adaptor*
Substitute 19.5V AC
Adaptor with another.
Main Board*
Check STBY 3.3V
Pin 12 CN2001
LD Board.
Is Pin 12 CN2001
on 3.3 volts?
Yes
LD Board
No
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 18
.
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