Optoma GT750 User manual

SERVICE MANUAL

Prepare : Check: Approve:

Date Revise Version Description

2011.08.01 V1.0 Initial Issue

Mina Amy

GT750

GT750 Condential I

Preface

This manual is applied to GT750 projection system. The manual gives you a brief

description of basic technical information to help in service and maintain the product.

Your customers will appreciate the quick response time when you immediately identify

problems that occur with our products. We expect your customers will appreciate the

service that you offer them.

This manual is for technicians and people who have an electronic background. Please

send the product back to the distributor for repairing and do not attempt to do anything that

is complex or not mentioned in the troubleshooting.

Notice: The information found in this manual is subject to change without prior notice. Any

subsequent changes made to the data herein will be incorporated in future edition.

GT750 Service Manual

Manual Version 1.0

GT750 Condential

Table of Content

Chapter 1 Introduction

Highlight 1-1

Compatible Mode 1-2

Chapter 2 Disassembly Process

Equipment Needed & Product Overview 2-1

Repair notice 2-2

Rod Adjustment 2-3

Re-write Lamp Usage Hour 2-4

Repair Action 2-5

Chapter 3 Troubleshooting

LED Lighting Message For Projector 3-1

Main Procedure 3-2

Chapter 4 Function Test & Alignment Procedure

Test Equipment Needed 4-1

Test Condition 4-1

I/O Port Test 4-2

Run In Test 4-8

Test Inspection Procedure 4-9

ADC Calibration 4-10

Restore Blower Speed 4-11

Chapter 5 Firmware Upgrade

Section 1: System Firmware Upgrade 5-1

GT750 Condential

III

Equipment Needed 5-1

Get into FW mode 5-2

Check FW version 5-2

Section 2: 8051 FW Upgrade (USB) 5-3

Equipment Needed 5-3

8051 Firmware Upgrade Procedure 5-4

Check 8051 FW version 5-5

Section 3: MST8535 Firmware FW Upgrade Procedure 5-6

Equipment Needed 5-6

USB Driver Upgrade Procedure 5-7

MST8535 Firmware Upgrade Procedure 5-9

Chapter 6 EDID Upgrade

EDID Upgrade Procedure 6-1

Appendix A Exploded Image I

Appendix B

Serial Number Denition I

PCBA Code Denition II

GT750  1-1

Chapter 1

Introduction

No  

1      

2

 

  

  

5









 



7 



  

  

10  



11  

12 











 

    

  

15 







  

1-1 Highlight

GT750  1-2

No  

17 







V 

          



  



 









1-2 Compatible Mode

Computer Compatibility (Analog/Digital)

Compatibility Resolution V-Sync [Hz] H-Sync [KHz]



  70

  

  

  70

  



  

 

  

  75



  

  

  75

  

 120

 75

GT750  

Compatibility Resolution V-Sync [Hz] H-Sync [KHz]



  

  

  75

 120

 75

  120

  



  

 

  

 

  75 



  

 50

 

 

 25

 

 50

 

  

 50

 



 50

 50

 

 

Note: If the Computer Compatibility supportive signal is different from User's Manual, please refer

to User's Manual.

GT750 Condential 2-1

Chapter 2

Disassembly Process

2-1 Equipment Needed & Product Overview

1. Screw Bit (+): 105

2. Screw Bit (+): 107

3. Screw Bit (-): 107

4. Hex Sleeves: 5 mm

5. Tweezers

6. Projector

* Before you start: This process is protective level II. Operators should wear electrostatic chains.

* Note: - If you need to replace the main board, you have to record the lamp usage hour.

- Some related contents please refer to common SM chapter 2.

GT750 Condential 2-2

2-2 Repair notice

Item Male Connector

on Main Board The key feature Figure

A & G Speaker Compose of Red/Black Wire and

Black wire tube (2 pin)

B Lamp Driver Black wire tube (5 pin)

CSystem Fan Compose of Red/Yellow/Black

Wire (3 pin)

D Photo Sensor Compose of Red/Black/White

Wire and Black wire tube (3 pin)

EBlower Compose of Black/Yellow/Red

Wire and Blue wire tube (3 pin)

FIR Compose of Black/Yellow/Red

Wire and Gray wire tube (3 pin)

Disassemble Main Board

Please refer to the below table details of

each connector on Main Board.

AG F E D C B

GT750 Condential 2-3

2-3 Rod Adjustment

1. Environment Adjustment

- The distance between the engine and

the screen is 93 CM.

- This process should be done at a dark

environment (under 10 Lux).

2. Procedure Adjustment

- Change the screen to "white screen".

- Adjust the screws on the engine module

to readjust the image.

("screw 1" should be adjusted rst, and

then "screw 2". Adjust until the yellowish

or bluish parts disappeared.)

3. Abnormal image inspection

- It should not have any abnormal color

at the rim of the image by estimating

through the eyes.

Note: - To avoid over adjusting the rod.

- After the operation, please use the glue

to x the screws.

Screw 1

Screw 2

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