Sony KDL-50W655A Service Manual ▷ View online
KDL-50W655A 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.
LAN
Power
Audio
2X 3X 4X 5X 6X 7X No
WIFI
Dead
Set
No
Video
No Audio
MAIN BOARD
*
▲
▲
▲
LCD PANEL
TCON
▲
▲
SERVICE BULLETIN
▲
SOFTWARE
WLAN
Video
Protection Modes
Board
LD BOARD
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.
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Whole
Screen
Distortion
Isolated
Area
Distortion
* 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-50W655A 6
SECTION 2 - TROUBLESHOOTING
FLOWCHARTS AND DIAGRAMS
OVERALL BLOCK DIAGRAM
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
RF
HDMI 1
SWITCH
UNIT
LCD PANEL
HFR
TCON
BLX
L
R
HEAD PHONES
OUT
OPTICAL
AUDIO OUT
IC4601
AMP
IC5009
HDMI
SWITCH
EQ
TUNER
ETHERNET
USB
HDMI 2
LVDS
AC IN
IC9000
A/V
DECODER
VIDEO
PROCESS
LED BACKLIGHT
AC ADAPTOR
WIFI
IR RX
LED’s
HIR
HSC
SMART CORE
LD
MAIN BOARD
LOCAL DIMMING
KDL-50W655A 7
SECTION 2 - TROUBLESHOOTING
POWER AND CONTROL BLOCK DIAGRAM
19.5V
GND
PWM_DIMMER
1, 2
5
3, 4
VLED
LD_STBY
6
7
7
LD_MODE_SW
DC_DIMMER
8
9
9
CN8202
CN1001
LD
BLX
10
LD_ERR
1
3
4
5
6
4
5
6
7, 8
9, 10
IP_REF
LD_MODE_SW
LD_STBY
FB_REF
PWM
VCC_IN
GND
LD_ERR
2
DC IN
LED 1
LED 2
LED 3
1
3
2
LED 4
NC
4
5 ~ 10
LED_VCC
11 ~ 14
LED
BACKLIGHT
LOCAL DIMMING
MAIN BOARD
KDL-50W655A 8
SECTION 2 - TROUBLESHOOTING
NO POWER FLOWCHART
No Power
No
See Protection
Flowchart
¿Is red light blinking
on front of TV?
Yes
No
AC Adaptor*
Substitute 19.5V AC
Adaptor with another.
Main Board*
¿Does TV
turn ON?
Yes
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 18
.
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