Read Sony KLV-22P413D / KLV-24P413D / KLV-24P423D Service Manual online
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APPENDIX-4
KLV-22P413D/24P413D/24P423D(IN5)
HOW TO RESET SERIAL NUMBER
1) Enter Factory menu by pressing the buttons on the remote commander:
Left Right Mute Enter Mute HOME
2) Move cursor to “SN Reset” (cursor on text is orange), then press Enter.
While system is resetting the serial number, LED will go out.
Please wait for the LED to turn on (green) again, you will see the menu item display like below:
SN Reset : Press
SN Reset : Ok
This means reset ok, you can edit serial
number in service menu now.
**Notice: After reset you will see the default serial
number display in service menu as AB12345