Sony KDL-70W856B Service Manual ▷ View online
KDL-70W856B 9
SECTION 2 - TROUBLESHOOTING
STANDBY LED BLINKING FLOWCHART
Protect
Shutdown.
Standby LED
Blinking
No
Yes
Power Supply
Board*
No
Yes
2X
Main Board*
3X
4X
No
Yes
5X
Yes
6X
No
7X
Immediately
LCD Panel*/
LD Board*
TCON*
(LCD Panel)
Yes
No
After a while
Check ventilation
10X
HEM3 Board
8X
Main Board*
Power Supply
Board*
No
Yes
10X
HEM3 Board
9X
Tuner Board*
Yes
No
Main Board*
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 19
.
KDL-70W856B 10
SECTION 2 - TROUBLESHOOTING
VIDEO DISTORTION FLOWCHART
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)
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 19
.
KDL-70W856B 11
SECTION 2 - TROUBLESHOOTING
*For Part Number information, refer to
“Section 4 - Exploded View/Part Number Information” on page 19
.
NO 3D VIEWING
Confirm with another
pair of Active
3D Glasses/
Touchpad Remote
Control?
No
Double images
displayed on
screen?
Yes
Main Board*
No
Yes
Press “3D” button on
Remote Commander
and select
“Simulated 3D”.
Active 3D
Glasses
View image with
known working
pair of Active
3D Glasses.
Double images
become one?
Yes
3D OK
No
Bluetooth
Board*
3D Not Working
Double images
become one/
Remote works
OK?
KDL-70W856B 12
SECTION 3 - REPAIR INFORMATION
REPAIRING THE TV
If the latest Software does not correct the issue, complete the following:
1. Verify the television has the symptom the customer indicated.
2. Replace part causing the symptom.
3. Install the latest version of Software (Required for ALL repairs).
4. Perform the required service adjustments and checks.
5. Verify the repair resolved the issue.
REMOVING THE REAR COVER
1.
Place TV face down on a soft and flat surface.
2. Remove all screws and detach the left and right Stand.
3. Remove 1 screw from AC Cover and disconnect the AC Power Cord.
HOLD
4. Locate and remove all screws from the Rear Cover.
CAUTION: To avoid any damage and/or deformation to the Rear Cover,
please refer to the following illustration.
Handling Area
(Firm, curled edges).
When handling the Rear Cover,
hold edges as shown:
OK to grab area
(Firm, sharp edges).
Grab with Caution
Grab with Caution
(Sharp edges, easy to deform).
Avoid area
Avoid area
(Sharp edges, easy to deform
or damage the Rear Cover).
Correct
Incorrect
5. Grasp the Rear Cover as shown in the illustration to separate from panel.
6. Firmly lift the Rear Cover on the shown areas to detach.
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