Sony KDL-32EX725 / KDL-40EX725 / KDL-55EX725 Service Manual ▷ View online
KDL-32EX725/40EX725/55EX725
43
SECTION 5 - FLOW CHARTS AND DIAGRAMS
Are
all voltage
Present
?
Yes
No
Is
Backlight ON
Before Shut
Down?
Yes
No
Yes
No
Replace
LCD Panel
Assembly
Check
LED-ON to LD-Board
*Before Shutdown
Is
voltage
3V Before
Shutdown
?
Yes
No
Is “SONY” logo
Displayed and
Tones Heard?
Check
Dimmer signal
*Before Shutdown
Is
voltage
1V to 3V Before
Shutdown
?
Check for
Short
6X Blink Pattern
(Backlight Error)
Is
Issue
Resolved
?
Issue
Resolved
Replace
LCD Panel
Assembly
Check
+109V & -70V
LED Supplies
*Before Shutdown
Replace
Main Board
Replace
Power Supply
Board
Replace
Main Board
Unit Shuts OFF
RED LED
Blinking
Check
24V to LD-Board
*Before Shutdown
Is
voltage
24V Before
Shutdown
?
No
Yes
Replace
LD-Board
Yes
No
Replace
TCON-Board
FIGURE 5-7. 6 BLINK ERROR
KDL-32EX725/40EX725/55EX725
44
SECTION 5 - FLOW CHARTS AND DIAGRAMS
7X Blink Pattern
Temperature Error
Clear unit ventilation areas
and confirm adequate local
room temperature
No
Does unit still
shutdown (7X)?
Issue
Resolved
Yes
Does
unit Shut-Down
Immediately after
Power ON
?
Yes
No
Unit Shuts OFF
RED LED
Blinking
Replace
Main Board
FIGURE 5-8. 7 BLINK ERROR
KDL-32EX725/40EX725/55EX725
45
SECTION 5 - FLOW CHARTS AND DIAGRAMS
NO PICTURE/NO SOUND
BATV
IC9000
X-Reality
(HDCP)
LCD Panel Assembly
TCON/HFR
(120Hz)
LCD
Panel
LED Backlight
System
CN2001
NAND FLASH
User Data
White Balance
GAMMA
User Menu (XMB)
Service Mode
TCON 12V
LCD Panel
LVDS Cable
RF Input
Video 2
(Component / Composite)
Video 1 (Composite)
PC Input
HDMI IN 1
(ARC)
HDMI IN 2
HDMI IN 3
IC5500
HDMI
Switch
&
EQ
(EDID)
RJ45 (Ethernent)
USB 2.0
HDMI IN 4
IC1404
NTSC/ATSC
Tuner IC
49
14
/
42
Digital Video
Interface
Interface
USB 2.0
Interface
R
L
F4200
IC4601
Output
Amplifier
LR
Audio
CN4602
AU12V
Headphone/Analog
Audio Output
Digital Audio
Output (Optical)
SPDIF
CN2700
J2702
IC4502
OPAMP
LR
Audio
Video
Audio
Video
Audio
Video
Video
Audio
Video
Video
Audio
Video
Audio
Video
Audio
Video
Video
Audio
Video
Video
Audio
To HDMI 1 for
ARC Output
From SPDIF Output
(Optical)
FIGURE 5-9. VIDEO/AUDIO DIAGRAM
KDL-32EX725/40EX725/55EX725
46
SECTION 5 - FLOW CHARTS AND DIAGRAMS
Missing or
Distorted Video
Is
Video Missing or
Distorted on
All
Inputs?
No
Yes
No
Can
User Menu be
Displayed
?
No
Is
Video
Missing
or
Distorted
?
Missing
Distorted
Is
Single Pixels
or
Complete Line
of Pixels
missing?
Yes
No
Yes
Is
Distortion
Present in
User Menu
OSD
?
No
Yes
Is
External Device
& connection OK
?
Repair External
Device
Check
External Device
and Connections
Swap Devices and
connections
Skew (or Rock) the LVDS
connector from its socket
at the TCON Brd.
Are
Flashes
of color
displayed
?
Yes
No
Check LVDS cable
for Physical Damage
Replace
LCD Panel
Replace
TCON Board
Replace
LVDS Cable
Yes
Sharp Horizontal
or Vertical Lines
Cable OK
Does
Distortion follow
picture size
when changing
WIDE mode
?
Perform WIDE Mode Test
Replace
TCON Board
No
Yes
Replace
Main Board
Replace
Main Board
Replace
Main Board
Replace
Main Board
Replace
Main Board
NG
FIGURE 5-10. NO VIDEO ERROR
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