---Part number can be found on a sticker.
After replacing this board, you may need to update the software to the latest version. Please go to esupport.sony.com and download the correct version for your model and follow all instructions.---
Sony 1-474-517-11 (APS-353, APS-353(CH)) G7 Power Supply Unit 
 Part Number: 1-474-517-11
Visible Number: APS-353
Visible Number: APS-353(CH)
Visible Number: 1-888-526-11
Warranty: 180-Day Warranty
Manufacturer Part Number: Sony 1-474-517-11 
 Known Models
Sony XBR-55X850A  
Sony XBR-55X900A