Monday, February 22, 2016

OPTOMA DLP projector - EP721- EP727 – Service mode – Lamp replacement - Disassembling top cover – Service mode adjustments – Projector repair and service

Category: DLP Projector Repair and Service 

Contents of this article 

  • How to access service mode 
  • Lap replacement procedure
  • Service mode adjustments  


OPTOMA
EP721- EP727

Service Mode
1. Turn on the projector
2. Do the following actions sequentially to get into service mode.
(1) Press “Power”, “Left”, “Left” and “menu” button sequentially.
(2) Service Mode will be shown.
(3) Choose “Exit” to leave the Service Mode after all.
OSD Reset
1. After final QC step, we have to erase all saved change again and resotre the OSD
default setting. The following actions will allow you to erase all end-users' settings and
restore the default setting:
(1) Please get into OSD menu.
(2) To execute "Reset" function.
PC MODE
1. Frequency and tracking boundary
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz (EP721/723 Family)
1024 x 768@60Hz (EP727/728 Family) 1280 x 800@60Hz (EW1610 Family)
- Test Pattern: General-1 or Master
- Check and see if the image sharpness is well-performed
- If not re-adjust by the following steps:
(1) Select "Frequency" function to adjust the total pixel number of pixel clock in one line period
(2) Select "Tracking" function and use right or left arrow key to adjust the value to minimize video flicker
- Adjust Resync or Frequency/Tracking/H. Position/V. Position to the inner screen.
Inspection item - Eliminate visual wavy noise by Rsync, Frequency or Tracking selction
- Check if there is noise on the screen
- Horizontal and vertical position of the vedio should be adjustable to the screen frame
Criteria - If there is noise on the screen, the product is considered as faliure product
- If there is noise on the screen, use auto or manul
“frequency” function or “tracking” function to adjust the screen
- The PC mode functionally sure be workable include support format with frequency and auto detected functional will be workable
2. Light Leak
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz (EP721/723 Family)
1024 x 768@60Hz (EP727/728 Family)
1280 x 800@60Hz (EW1610 Family)
- Test Pattern: Gray 10
- Check if the light leaks
* Light leak on reflective edge, eyecatcher, bondwires and exposed metal.
Inspection item - Light leak check
- Bright blemish (dirty)
Criteria - The pattern cannot accept the color level of the leakage is brighter than the gray 10 pattern
- Ref. Defect Specification table
Note: The defect criteria follows TI specification
3. Blemish (Dark)
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz(EP721/723 Family)
1024 x 768@60Hz (EP727/728 Family)
1280 x 800@60Hz (EW1610 Family)
- Test Pattern: Blue 60
Inspection item - Dark blemish check. (dirty)
Criteria - The dark blemish is unacceptable in zone A.
The number of dark blemish is less or equal to 4 pixels in zone B.
4. Blemish (Bright)
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz(EP721/723 Family)
1024 x 768@60Hz(EP727/728 Family)
1280 x 800@60Hz(EW1610 Family)
- Test Pattern: Gray 30
Inspection item - Dark blemish check.(dirty) Criteria - The bright blemish is unacceptable when it is more.
than 4 pixels on gray 30 pattern
- Ref. Defect Specification table
Note: The defect criteria follows TI specification
5. Dead Pixel (Bright pixel)
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz (EP721/723  Family)
1024 x 768@60Hz (EP727/728 Family)
1280 x 800@60Hz (EW1610 Family)
- Test Pattern: Full black
Inspection item - Bright pixel check
Note: Frame dimension under operative zone1 inch Criteria - Bright pixel is unacceptable except that 1 pixels is  allowed on frame edge.
- Ref. Defect Specification table Specification table
Note: The defect criteria follows TI specification
6. Dead Pixel (Dark pixel)
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz(EP721/723 Family)
1024 x 768@60Hz(EP727/728 Family)
1280 x 800@60Hz(EW1610 Family Family
- Test Pattern: Full white
Inspection item - Dead pixel check
- White pattern (IRE=100)
- Adjacent dark pixel
Criteria - The number of the dead pixels should be less or equal to 3 pixels
- Adjacent pixel with each other is unacceptable.
7. Focus test
Procedure - Test equipment: video generator
- Test signal: analog 800 x 600@60Hz(EP721/723 Family)
1024 x 768@60Hz(EP727/728 Family)
1280 x 800@60Hz(EW1610 Family)
- Test Pattern: Full screen or MEME Sony
Inspection item - Focus check
Criteria - From screen 1.5 M via visual to check the focus, look at the entire screen, focus shall be clear, crisp, and sharp over the entire surface of the display pattern. (Blur word on one of the corner after adjustment is acceptable. However, the word should at least be recognizable.)
8. Color performance
Procedure - Test equipment: video generator
- Test signal: DVI (HDMI) 720p,1080i,1080P
- Test Pattern: Master, 64 GRAY RGBW or SMPTE RP-133
* Get into service mode. Use 720P, 1080i&1080P signal, master pattern to do HDTV test. Color cannot discolor to purple and blue.
Inspection item - Check if each color level is well-functioned
- color saturations
Criteria - Screen appears normal. It should not have any abnormal condition, such as lines appear on the screen and so on
- Color appears normal
- It is acceptable to have few lines flashing at the center and on the edge of 1080i image. However, rest of the image should appears stable
- RGBW should all appear normal on the screen and sort from R-G-B-W
- Color levels should be sufficient and normal. (the unidentified color levels on both left and right sides should not over 8 color levels.)
- Grey level should not have abnormal color or heavy lines.
- The PC mode functionally sure be workable include support format with frequency and auto detected functional will be workable.
Disassemble Lamp Cover
1. Unscrew 2 screws to disassemble the Lamp Cover.

Disassemble Lamp Module
1. Unscrew 2 screws then pull out the Lamp Module.

Disassemble Top Cover Module
1. Unscrew 6 screws (4 screws on the unit base and 2 screws on the beside)and
3 connectors.
Note: - Push the top cover(as the red arrow) then pull up it.Because there are 8 tenons on it.
- Avoid damage by pulling and dragging IR cable and keypad FPC cable.
- Hold the CNNT plug when pulling the FPC cable is strongly recommended. Pulling the cable directly from the unit will cause the cable damages.
- Make sure cables are plug in the correct ports when assembling the unit.