Sony KDL-46HX855 / KDL-55HX855 (serv.man2) Service Manual ▷ View online
KDL-46HX855/55HX855 12
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 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
NO POWER FLOWCHART
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 17
.
KDL-46HX855/55HX855 13
SECTION 3 - FLOW CHARTS AND DIAGRAMS
STANDBY LED BLINKING
Protect
Shutdown.
Standby LED
Blinking
No
Yes
Power Supply
Board*
No
Yes
2X
Main Board*
3X
4X
No
Yes
5X
Yes
6X
No
7X
Imediately
LCD Panel*
TCON
(LCD Panel)*
Yes
No
After a while
Main Board*
Check ventilation
10X
HEM3 Board
Power Supply
Board*
8X
See Resolving an
8x Error
10X
3D IR Emitter
Board*
PROTECTION SHUTDOWN FLOWCHART
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 17
.
KDL-46HX855/55HX855 14
SECTION 3 - FLOW CHARTS AND DIAGRAMS
NO PICTURE
No Video
Backlights
turned on?
Unplug LVDS
connector with
unit off. Turn unit
back on
Test patterns
display on
screen?
Yes
No
TCON
(LCD Panel)*
Sony logo
appears
momentarily?
No
Main Board*
No
Yes
Yes
Main Board*
Locate
CN6401 on
Power Supply
Board
Zero volts at
Pin 2?
TCON
(LCD Panel)*
Yes
No
Zero volts at
Pin 4?
Yes
Main Board*
No
LCD Panel*
NO VIDEO FLOWCHART
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 17
.
KDL-46HX855/55HX855 15
SECTION 3 - FLOW CHARTS AND DIAGRAMS
Video Distortion
Is distortion
across entire
screen?
Any horizontal
lines?
No
No
Yes
Yes
Improper or
missing colors?
Yes
Main Board*
No
Vertical lines
or bars?
No
Yes
Lines
move when
wide-mode
changed?
Yes
No
TCON*
(LCD Panel)
Main Board*
LCD Panel*
Any single or
isolated vertical
lines?
Yes
LCD Panel*
More than 1
vertical band?
No
Yes
TCON*
(LCD Panel)
VIDEO DISTORTION
*For Part Number information, Refer to
“Section 4 - Disassembly/Part Number Information” on page 17
.
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