BenQ Th681 Digital Projector User Manual

Maintenance 51 The Lamp Settings page appears. Highlight Reset Lamp Timer. A warning 
message appears asking if you want to reset the lamp timer. Highlight Reset and 
press MODE/ENTER. The lamp time will be reset to “0”.
Do not reset if the lamp is not new or replaced as this could cause damage.  

Maintenance 52
Indicators
LightStatus & Description
Powe r  ev e n t s
Orange Off OffStand-by mode.
Green
FlashingOff OffPowering up.
Green Off OffNormal operation.
Orange
FlashingOff OffNormal power-down cooling
Red Off OffDownload
Green Off RedCW start fail
Red Flashing Off OffScaler shutdown fail (data abort)
Lamp events
Off Off RedLamp1 error in normal operation
Off OffOrange 
FlashingLamp is not lit up
Thermal events
Red Red OffFan 1 error (the actual fan speed is +25% outside 
the desired speed)...

Troubleshooting 53
Troubleshooting
The projector does not turn on.
No picture
Blurred image
Remote control does not work
The password is incorrect
CauseRemedy
There is no power from the power cord.Plug the power cord into the AC power jack on 
the projector, and plug the power cord into the 
power outlet. If the power outlet has a switch, 
make sure that it is switched on.
Attempting to turn the projector on again 
during the cooling process.Wait until the cooling down process has 
completed....

Specifications 54
Specifications
Projector specifications
All specifications are subject to change without notice.
Optical
Resolution
1920 (H) x 1080 (V)
Display system
1-CHIP DMD
Lens F/Number
F = 2.59 ~ 2.87, f = 16.88 ~ 21.88 mm
Lamp
210 W lamp
Electrical
Power supply
AC100–240V, 3.1 A, 50–60 Hz 
(Automatic)
Power consumption
315 W (Max); < 0.5 W (Standby)
Mechanical
Weight
2.8 Kg (6.39 lbs)
Output terminals
RGB output
D-Sub 15-pin (female) x 1
Speaker
(Stereo) 10 watt x 1
Audio signal output
PC audio...

Specifications 55
Dimensions
311.81 mm (W) x 104.7 mm (H) x 244.12 mm (D)
Ceiling mount installation
311.81
244.12
104.7
Unit: mm
626.11
582.2
537.9
25
95.21
168.59
239.77 111.28                      311.58
137160
115
127.7
80
Ceiling Mount screw: M4
(Max L = 25 mm; Min L = 20 mm)
Unit: mm 

Specifications 56
Timing chart
Supported timing for PC input
•  *Supported timing for 3D signal in Frame Sequential, Top Bottom and Side by Side formats.
**Supported timing for 3D signal in Frame Sequential format.
***Supported timing for 3D signal in Top Bottom and Side by Side format.
ResolutionMode
Ve r t i c a l  
Frequency 
(Hz)Horizontal 
Frequency 
(kHz)Pixel 
Frequency
(MHz)
640 x 480VGA_60* 59.940 31.469 25.175
VGA_72 72.809 37.861 31.500
VGA_75 75.000 37.500 31.500
VGA_85 85.008 43.269 36.000...

Specifications 57
•  The timings showing above may not be supported due to EDID file and VGA graphic card limitations. It is 
possible that some timings cannot be chosen.
Supported timing for HDMI (HDCP) input
•  *Supported timing for 3D signal in Frame Sequential, Top Bottom and Side by Side formats.
**Supported timing for 3D signal in Frame Sequential format.
***Supported timing for 3D signal in Top Bottom and Side by Side formats.
ResolutionModeVe r t i c a l  
Frequency 
(Hz)Horizontal 
Frequency...

Specifications 58
•  The timings showing above may not be supported due to EDID file and VGA graphic card limitations. It is 
possible that some timings cannot be chosen.
*Supported timing for 3D signal in Frame Sequential format.
**Supported timing for 3D signal in Top Bottom, Frame Packing and Side by Side formats.
***Supported timing for 3D signal in Frame Sequential, Top Bottom, Frame Packing and Side by Side 
formats.
****Supported timing for 3D signal in Side by Side format.
*****Supported timing...

Specifications 59
Supported timing for Video and S-Video inputs
*Supported timing for 3D signal in Frame Sequential format.
Video modeHorizontal 
Frequency (kHz)Ve r t i c a l  F r e q u e n c y  
(Hz)Color sub-carrier 
Frequency (MHz)
NTSC* 15.73 60 3.58
PAL 15.63 50 4.43
SECAM 15.63 50 4.25 or 4.41
PAL-M 15.73 60 3.58
PAL-N 15.63 50 3.58
PAL-60 15.73 60 4.43
NTSC4.43 15.73 60 4.43 

Warranty and Copyright information 60
Warranty and Copyright information
Limited warranty
BenQ warrants this product against any defects in material and workmanship, under 
normal usage and storage.
Proof of purchase date will be required with any warranty claim. In the event this product 
is found to be defective within the warranty period, BenQs only obligation and your 
exclusive remedy shall be replacement of any defective parts (labor included). To obtain 
warranty service, immediately notify the...