Optoma H27 Service Manual page 23

c. Check IR Receiver Board
d. Check Main Board
- Control Panel Failed
a. Check Cable FFC
b. Check Keypad Board
c. Check Main Board
- Function Abnormal
a. Do "Factory Reset" of the engineering mode
b. Do Firmware Upgrade
c. Check Main Board
d. Check DMD Board
3-2.15 Firmware/EDID Upgrade Failed
- Check hardware setting
Firmware hardware setting (please refer to pages 5-1 and 5-2)
EDID hardware setting (please refer to pages 6-1 and 6-2)
- Check PC/Laptop setting
- Check PC/Laptop OS system
- Check program
- Re-boot PC/Laptop
- Check Main Board
3-2.16 Other Input Signal Problem
- Video/S-Video No Image, Image Noise or Line Defect (DVI input OK)
a. Check Main Board
- DVI No Image (Video/S-Video input OK)
a. Check Main Board
- DVI Image Noise/Ripple (Video/S-Video input OK)
a. Adjust "Tracking" function
b. Change resolution/refresh rate
c. Check Main Board
- DVI Line Defect (Video/S-Video input OK)
a. Check Main Board
- DVI input with poor quality of text
a. Check resolution
b. Check Main Board
3-4
H27