Acer PD721 Service Manual page 35

Start
Is LED
No
Check power cord
indicator OK?
Yes
No
Change
Is Fan working?
Yes
Can hear the
No
Is Lamp lit?
sound of lamp
Yes
Lamp Module
End
Yes
& input power
voltage
No
Supply AC
Power
No Change
Thermal BD
DC-DC
No
Change
Ballast
ignition
Yes
Reassembly Replace
No
Lamp Module
No
Lamp Replacement
Cover assembly
OK?
Yes
No
Change Change
Ballast DC-DC
Change
No
Fan Module
No No
Change
Main BD
Reassembly lamp
Replacement Cover
No
Change
Main BD
Change
No
Change
Thermal
DC-DC
BD