Optoma H31 Service Manual page 37

H31 Enter the service mode produce :
1. Power on.waiting for the "No Signal" show on the screen.
2. Press "Up" ,"Enter" button at the same time twice.then press "Left" ,"Enter" button at the same time
twice.
H31 Logo Change Procedure!!
1. Enter service mode.
2. Move the cursor to "Display Source" selection.
3. Press and hold on "Up" and "Left" control button at the same time, then press "Down" button.
4. There will be a "Logo Select" function enable.
5. Enter the "Logo Select" for the Logo change.
Coretronic Corporation
5-5 H31