Sony KDL-40EX725 Service Manual page 54

SECTION 5 - FLOW CHARTS AND DIAGRAMS
KDL-32EX725/40EX725/46EX725/55EX725
Missing or
Distorted Video
Is
Check External Device
Video Missing or
No and Connections
Distorted on All
Swap Devices and
connections
Inputs?
Yes
Is
Distorted
Video Missing
or Distorted
?
Missing
Can
User Menu be Yes Replace
Displayed Main Board
?
No
Skew (or Rock) the LVDS
connector from its socket
at the TCON Brd.
Are
Flashes
Replace
Yes
of color
Main Board
displayed
?
No
Replace
TCON Board
FIGURE 5-10. NO VIDEO ERROR
Is
Yes
External Device
& connection OK
?
No
Repair External
Device
Is
Distortion
No
Present in
User Menu
OSD
?
Yes
Sharp Horizontal
Is
or Vertical Lines
Single Pixels
No
Check LVDS cable
or Complete Line
for Physical Damage
of Pixels
missing?
Yes
Perform WIDE Mode Test
Replace
LCD Panel
Replace
Main Board
Replace
Main Board
NG Replace
LVDS Cable
Cable OK
Does
Distortion follow
Yes
Replace
picture size
when changing Main Board
WIDE mode
?
No
Replace
TCON Board
48