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KDL-55X4500 - Sony TV Service Manual (repair manual). Page 28

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KDL-55X4500 (CH)     2-11
No Picture
Power-ON_LED
Light 
STBY_3.3V
OK?
G6 board has problem.
Change G6 board.
No
No
Yes
Yes
STBY_LED
Blinking?
Yes
2 times 
blinking
6 times
blinking
Yes
Yes
No
No
Signal board has problem.
Check signal-board
G6 board has problem.
Change G6 board.
No
Signal board has problem.
Check signal-board
AC_OFF_DET
more than 3V
Yes
G6 board has problem.
Change G6 board.
No
CN6150 9pin
more than 3V
Yes
Signal board has problem.
Check signal-board
No
G6 board has problem.
Change G6 board.
CN6150 1-4pin
=12
±
1V
Signal board has problem.
Check ACW board
Yes
No
2-2-6. NO PICTURE
to 
GL board check
Power-ON
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