Optoma H31 Service Manual page 22

3-2.1 A. Power Troubleshooting
Start
Is Power
No
LED indicator
OK ?
Yes
Is Temp
No
LED indicator
OK ?
Yes
No
Is Lamp LED
indicator OK ?
Yes
No
Light doesn't
work
Yes
No Change
Fail
Lamp
to light
Yes
End
Coretronic Corporation
No
Check Lamp Cover
assembly
Is Fan
No
working ?
Change
No
Lamp Module
Change
No
Change
Main Board
Ballast
Change
No
Ballast
Supply
AC power
No
Check Power
cord & input power
voltage
Yes
No
Change
LVPS
Change
Change
No
Fan
LVPS
Module
Change
Ballast
3-3
No
Change Change
Main Board Ballast
Change
No
Thermal
Sensor
H31