BenQ SX930, Service Manual

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Chapter 2 Optical & Optical Engine Trouble Shooting Guide
No. Item Trouble Shooting Guide
1 Brightness
1. Change lamp
2 Uniformity
1. Change lamp
3 FOFO Contrast
1. Check ADC calibration
2. Check user’s menu brightness & contrast are default
3. Clean DMD
4. Clean PL
4 ANSI Contrast
1. Clean PL
2. Clean DMD
3. Change PL
5 Color
1. Check color wheel delay
2. Replace CW if necessary
6 Color Uniformity
1. Change lamp
7 Blue Edge
1. Refer to Item#2-1 (attached below)
2. Change CM
3. Change SUB HSG
8 Blue/Purple Border
1. Refer to Item#2-1(attached below)
2. Change CM
3. Change SUB HSG
9 Focus
1. Change Projection Lens
2. Check parallel between PL datum and DMD
10 Dust
Clean DMD
11
Horizontal/Vertical
Strips
1. Check connector between chip BD and Main BD
2. Re-install DMD with chip BD
3. Check if any pin of C-Spring is missing, damaged or dirty
4. Change new Chip BD
5. Change new DMD
12 Pixel Fail Change new DMD
2-1. “Blue Edge” Trouble Shooting:
I. Re-adjust “Overfill” first.
For Overfill Re-adjustment:
i. Those 2 Adjustment Screws must be released for around 2 mm first.
ii. Alignment Sequence:
a. To adjust “Horizontal Adjustment Screw” firstly, then “Vertical Adjustment Screw”.
b. Refer to Figure 2-1..