KDL-40R450A, KDL-46R450A - Sony TV Service Manual (repair manual). Page 21

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KDL-40R450A/46R450A 17
SECTION 3 - REPAIR INFORMATION
REPLACING THE POWER SUPPLY BOARD
1.  Remove screws to detach Bracket, then unhook Power Cord from Rear 
Cover clip.
 
2.  Remove 7 screws from Power Supply Board.
3.  Tilt board to reach Power Cord connector and disconnect.
4.  Disconnect all the remaining connectors to detach from the Rear Cover.
5.  Install the new Power Supply Board.
6.  Update the Software.
After ALL repairs UPDATE the SOFTWARE to the latest version. 
Instructions are included with the Software package on the 
Sony 
Authorized Service Portal
 website.
a.  Insert the USB device with the latest Software into the TV.
b.  Press 
POWER
 to turn on the TV.
c.  Wait until the Software update is complete.
REMOVING THE SWITCH UNIT
1.  Lift the black locking bar and pull FFC cable to release.
2.  Locate gap between Switch Unit and Rear Cover, pull upwards to detach. 
3.  Install the new Switch Unit.
REMOVING THE SPEAKERS
1.  Pull Speakers up and disconnect the connectors to detach. 
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