Sony KDL-46W955A / KDL-55W955A Service Manual ▷ View online
KDL-46W955A/55W955A 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.
LAN Power
Audio
2X 3X 4X 5X 6X 7X 8X No
WIFI
Dead set
No
Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No Audio
MAIN BOARD
*
▲ ▲
▲
▲
POWER SUPPLY
LCD Panel
TCON
▲
▲
SERVICE BULLETIN
▲
SOFWARE UPDATE
WLAN
Video
Protection Modes
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board
* Immediate Shutdown After Power ON & 7X
*NOTE: REFER TO LCD PANEL SERVICE MANUAL IN
REFERENCE LIBRARY DATABASE FOR CORRECT
REPLACEMENT PARTS BASED ON SERIAL NUMBER.
KDL-46W955A/55W955A 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
IR RX
OPTICAL
SENSE
POWER SUPPLY
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
RF
HDMI 1
LCD PANEL
HFR
TCON
L
R
OPTICAL
AUDIO OUT
HDMI 3
TUNER
ETHERNET
HDMI 2
LVDS
AC IN
MAIN BOARD
IC 9001
HDMI
SWITCH
EQ
BM
G3A (46”)
G3B (55”)
BLUETOOTH
HSC
HIR
WIFI
SMART CORE
SWITCH UNIT
AND
USB PORT
AMP
HW
HUS
AMP
HP/LINE OUT
HDMI 4
USB
IC 9000
A/V
DECODER
VIDEO
PROCESS
LD
KDL-46W955A/55W955A 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
POWER_ON
28
27
23
23
STBY 3.3V
13~17
5
BL_ERR
1
AC IN (N)
AC IN (L)
1
2
2
CN6401
BM
BL_ON
1
2
4
5, 6
CN9101
11, 13, 14
12
8, 10
16
18
18
CN6101
LD
MAIN BOARD
POWER SUPPLY
VLED_VCC
VLED_GND
CN6601
SIGNAL_GND
LD_ERR
1~4
6~9
6~9
3
4
4
10
11
11
AC OFF DET
REG 12V
3
2
2
PWM_DIMMER
DIMMER
DC_DIMMER
POWER_ON
BL_ERR
REG 12V
PWM_DIMMER
BL_ON
GND (AU)
STBY 3.3V
AC OFF DET
REG 12V (AU)
GND
REG 12V (PANEL)
7, 9
19
20
20
10~12
21,22
GND
GND
12
14
14
GL_CTRL
REG_12
CN2001
LCD PANEL, TCON
LED BACKLIGHTS
&
G3A (46”)
G3B (55”)
KDL-46W955A/55W955A 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?
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 18
.
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