Sony KDL-40SL140 Training Manual page 37

NOTE: Confirm all connections
between circuit boards before replacing
All Video Inputs :
Video 1 Composite & S-Video
Video 2 Composite
Video 3 DMPORT
Component 1, 2
HDMI 1, 2
PC IN
ATSC/NTSC (Tuner)
Reference Figure 3-4
Reference Figure 3-4
▲
Replace
LCD Panel
CTV-51
KDL-40, 46SL140 Missing or Distorted Video
D
Troubleshooting Flowchart D
Primary – Mostly Defect
Missing or
▲
Secondary – Possible Defect
Distorted Video
■
Last Resort – Improbable Defect
Is
Check External Device
Video Missing or
No and Connections
Distorted on All Swap Devices and
Inputs ?
Yes
Is
Distorted
Video Missing
or Distorted
?
Missing
Can
Yes
User Menu be Replace
Displayed BM5-Board
?
No
Check LVDS cable Video
Signal Levels
CN9102/pins 14-42 & at
TCON Brd
Are
No
All Signal Replace
Levels OK BM5-Board
?
Yes
Check 12V at
CN9102/pins 47-51
at TCON Brd
Is
Yes No
Replace
12V Present
BM5-Board
?
Is
External Device
& connection OK
connections ?
No
Repair External
Device
Is
Distortion
Present in
User Menu
OSD
?
Yes
Is
Single Pixels
or Complete Line
of Pixels
missing?
Yes
▲
Replace
LCD Panel
Triage Charts & Troubleshooting Flowcharts
Yes
Replace
BM5-Board
No
Replace
BM5-Board
No
Check LVDS cable
for Physical Damage
Reference Figure 3-4
▲
Is
Replace
No
LVDS Cable
LVDS Cable
Okay?
If Damaged
Yes
▲
Replace
LCD Panel
36