Sony KDL-40HX755 / KDL-46HX755 / KDL-55HX755 Service Manual ▷ View online
KDL-40HX755/46HX755/55HX755 11
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.
2. Select that symptom from the chart.
▲
3. Bring the primary component listed for that symptom.
3D LAN Power
Audio
2X 3X 4X 5X 6X 7X 8X
10X
No
WIFI
Dead set
No Video
Whole
Screen
Distortion
Isolated
Area
Distortion
No 3D
No Audio
Main Board
*
▲
▲
▲
▲
Power Supply
HL
HEM3
LCD Panel
▲
TCON
▲
▲
SERVICE BULLETIN
SOFTWARE UPDATE
WLAN
BLUE Triangle: (Secondary) Possible defective part
5. Chart Color Code
RED DOT: (Primary) Most likely defective part
Video
Protection Modes
4. Follow the associated flowcharts in the Training Manual to isolate the board.
Board Reference
* 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-40HX755/46HX755/55HX755 12
SECTION 3 - FLOW CHARTS AND DIAGRAMS
BLOCK DIAGRAM
VIDEO 2 CVBS/COMP
VIDEO 1 CVBS
RF
HDMI 1
PC HD15
SWITCH
UNIT
LED
IR RX
LIGHT SENSE
LCD PANEL
HFR
TCON
BAP
HLR2
L
R
ANALOG AUDIO
OUT
OPTICAL
AUDIO OUT
HDMI 3
IC4601
AMP
IC5500
HDMI
SWITCH
EQ
TUNER
EITHERNET
USB2.0
HDMI 2
HDMI 4
LVDS
AC IN
IR
TRANSMITTER
HEM3
WIRELESS
LAN CARD
IC9000
A/V
DECODER
VIDEO
PROCESS
USB2.0
USB HUB
LED BACKLIGHTS
POWER SUPPLY/
CONVERTER
GL7 (55")
GL6 (40/46")
L
R
IC4701
SUB-
WOOFER
AMP
OVERALL BLOCK DIAGRAM
KDL-40HX755/46HX755/55HX755 13
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO POWER
+OUT1
+OUT2
NC
NC
1
2
3
4
2
3
4
DC_DIMMER
BLINKING
PWM_DIMMER
BL_ERR
1
2
3
4
2
3
4
BL_ON
GND
DIGITAL_STBY
AU_GND
5
6
6
7, 8
9~12
REG12V
TCON_ON
AU_12V
STBY3.3V
13,14
17, 18
19
CN6601
CN6205
TCON_VCC
AUDIO_GND
AU_12V
REG12V
1
2, 4
3, 5
3, 5
12, 8
AUDIO_12V
STBY3.3V
7, 9
10
BLINKING
DIGITAL_STBY
POWER_ON
PWM_DIMMER
DC_DIMMER
CN6001
TO LED
BACKLIGHTS
BAPS
GL7
-OUT1
-OUT2
NC
NC
1
2
3
4
2
3
4
CN6602
AC_OFF_DET
POWER_ON
26
27
28
27
28
23
TCON_VCC
12
13
14
15
16
17
18
19
20
13
14
15
16
17
18
19
20
BL_ON
BL_ERR
AC_OFF_DET
TCON_ON
GL6
POWER AND CONTROL BLOCK DIAGRAM
KDL-40HX755/46HX755/55HX755 14
SECTION 3 - FLOW CHARTS AND DIAGRAMS
No Power
Is standby LED
blinking?
No
Yes
No
See
Protection Shutdown
flowchart
Yes
Does red standby
LED on front panel
light?
High (>2.5V)
on pin 27 of CN6205
on power supply?
Yes
No
Main Board*
Press power
button while
monitoring pin 28
of CN6205 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
NO POWER FLOWCHART
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 19
.
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