I have a lot of this experience, normally are because of the voltage regulator ic problem. The number is 78L05, the size of this IC like C945 same color also. So be careful to find it. They're near on MCU ic. More repairing information and tips, you can try my website here: www.fastrepairguide.com .
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OSD LOCKED/UNLOCKED This function allows you to lock the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button for several seconds. The message "OSD LOCKED" should appear. You can unlock the OSD controls at any time by pushing the MENU button for several seconds. The message "OSD UNLOCKED" should appear.