DOWNLOAD Sony XBR-55X900A Service Manual ↓ Size: 8.22 MB | Pages: 40 in PDF or view online for FREE

Model
XBR-55X900A
Pages
40
Size
8.22 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
xbr-55x900a.pdf
Date
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Sony XBR-55X900A Service Manual ▷ View online

XBR-55X900A 9
SECTION 2 - TROUBLESHOOTING
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 28
.
NO POWER FLOWCHART
No Power
Is Standby LED 
blinking?
No
Yes
No
See Stanby
LED Blinking
Flowchart
Yes
Does red 
Standby LED on 
front panel light?
High (>2.5V)
on Pin 1 of CN6101 
on Power Supply?
Yes
No
Main Board*
Press power 
button while 
monitoring Pin 7 
of CN6601 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.
XBR-55X900A 10
SECTION 2 - TROUBLESHOOTING
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 28
.
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*
TCON*
(LCD Panel)
Yes
No
After a while
Check ventilation
10X
HEM3 Board
8X
See Triage Chart
Main Board*
Power Supply 
Board*
No
Yes
XBR-55X900A 11
SECTION 2 - TROUBLESHOOTING
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 28
.
NO VIDEO FLOWCHART
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 5?
TCON*
(LCD Panel)
Yes
No
Zero volts at 
Pin 3?
Yes
Main Board*
No
LCD Panel*
XBR-55X900A 12
SECTION 2 - TROUBLESHOOTING
VIDEO DISTORSION FLOWCHART
*For Part Number information, refer to 
“Section 4 - Exploded View/Part Number Information” on page 28
.
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)
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