Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary
SOURCE: Remote Codes for new Sony Bravia
0000 worked for my XBR4 using the remote called: Comcast Custom DVR 3 Device found here:http://www.comcast.com/corporate/customers/customer_support/remotes.html
SOURCE: programming remote to operate Sony Bravia TV
You can find your codes here:
www.tvcodes.com
OR
www.remotecodelist.com
OR
www.remotecontrolsrus.com
SOURCE: My RM-YD028 Sony BRAVIA Remote
Remove the batteries from the remote and wait 5 minutes or more. After waiting, insert the batteries again. The remote should now work. If it's still not working, the remote is probably defective. If that is the case, please contact Sony Customer Support, which will be able to assist you in getting a replacement issued.
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