MiTAC 15EX-TA Troubleshooting Manual

15EX-TA

TESTING TECHNOLOGY DEPARTMENT / TSSC

BY

：：：：

Richard Wang

JUN. 2001

SERVICE MANUAL & TROUBLESHOOTING GUIDE FOR

LCD MONITOR 15EX

LCD MONITOR 15EX--

TA MAINTENANCE

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1. 1515EXEX--

TA Product Specification

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1.1 Scope---------------------------------------------------------------------------------------------------------------------------------------

1.2 Main Characteristics-------------------------------------------------------------------------------------------------------------------

1.3 Hardware System Block Diagram---------------------------------------------------------------------------------------------------

1.4 Power Supply ( AC - Adapter )------------------------------------------------------------------------------------------------------

2. System Assembly & Disassembly

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2.1 System View------------------------------------------------------------------------------------------------------------------------------

2.2 System Disassembly---------------------------------------------------------------------------------------------------------------------

3. Definition & Location Of Connectors / Jumpers

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3.1 15EX-TA Interface Board-------------------------------------------------------------------------------------------------------------

3.2 Power Jack Board-----------------------------------------------------------------------------------------------------------------------

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3.3 Invertor Board---------------------------------------------------------------------------------------------------------------------------

3.4 Phone Jack Board-----------------------------------------------------------------------------------------------------------------------

3.5 Key Switch Board-----------------------------------------------------------------------------------------------------------------------

3.6 Relation Of All Components----------------------------------------------------------------------------------------------------------

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Definition & Location Of Major Components

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5. Pin Description Of Major Components

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5.1 gmZAN1 Flat Panel Controller IC---------------------------------------------------------------------------------------------------

6. 15EX

6. 15EX--

TA System Block Diagram

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6.1 System Block Diagram-----------------------------------------------------------------------------------------------------------------

6.2 15EX-TA Interface Board Block Diagram-----------------------------------------------------------------------------------------

CONTENTS

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3 4 15 16

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27 28 28 28 29

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31 32

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7.

Trouble Shooting

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7.1 No Power----------------------------------------------------------------------------------------------------------------------------------

7.2 No Display ( System Fail ) Or Display Abnormal---------------------------------------------------------------------------------

7.3 OSD Function Or Display Abnormal------------------------------------------------------------------------------------------------

7.4 No Back light-----------------------------------------------------------------------------------------------------------------------------

7.5 PC Can’t Detect LCD Monitor Type------------------------------------------------------------------------------------------------

7.6 LCD Monitor Audio Function Abnormal------------------------------------------------------------------------------------------

8. Spare Parts List

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9. System Explode View

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10. Circuit Diagram

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11. Reference

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CONTENTS

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42 46 48 50 52 54

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LCD MONITOR 15EX

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1. 15EX-TA PRODUCT SPECIFICATION

1.1. SCOPE

The MiTAC 15EX-TA (TFT with analog signal input) is a high resolution (max. resolution 1024 X 768) color LCD monitor which uses 15” high contrast TFT-LCD panel.

This monitor supplies user with following features:

 On screen display adjustment function

 Multi-sync process

 DPMS power saving function

 VESA standard compatible ME design

 Swivel function of display panel

 Plug & Play (DDC1/2B) function

 Auto Brightness Adjustment.

 Audio amplifier(optional)

 Earphone output(optional)

 Microphone input(optional)

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1.2 MAIN CHARACTERISTICS

1.2.1 LCD PANEL:

LCD panel: 15” color TFT-LCD Model no.: (1) HYUNDAI HT15X11-200; (2) CHI MEI M150X1-01; (3) HANNSTAR HSD150MX42-A

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1.2.2 SIGNAL INPUT CABLE:

High density 15 pins “D” type, male connector cable.

1.2.3 VIDEO SIGNAL:

Max. 80 MHz bandwidth Input video voltage range: 0.6~0.95 Vp-p, typ.: 0.7 Vp-p Impedance: 75Ω±5% / 50 pF(max.)

1.2.4 SCAN FREQUENCY:

Horizontal frequency: 24.8 ~ 60 kHz Vertical frequency: 56 ~ 75 Hz Polarity (positive or negative): 3V ~ 5V

Input impedance: 470 (min.)/ 1000 pF(max.)

1.2.5 MULTI-SYNC PROCESS:

Separate SYNC is acceptable.

1.2.6 VESA STANDARD WALL MOUNTING.

1.2.7 SWIVEL:

Up/Down: 25º/-3º

1.2.8 PLUG & PLAY:

DDC1/DDC2B

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1.2.9 EXTERNAL CONTROLLER & OUTLET:

LCD control key: MENU, SELECT, - , + , BRIGHTNESS, POWER.

1.2.10 AC INPUT POWER:

Max. 264 Vac/50 Hz, Min. 90 Vac/60 Hz

Normal 100 ~ 240 Vac/60 ~ 50 Hz

1.2.11 POWER SAVING FUNCTION & INDICATOR COMPLY WITH VESA DPMS

1.2.12 Auto Brightness Adjustment:

Push Hot Key to select function.

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1.2.13 COMPATIBLE TIMING CHART:

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1.2.14 : MAIN OSD MENU

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 Key definition :

Menu, Select, Left (Decrease, ←), Right (Increase,→ ) and Power 5 keys.

Select Key : Only one shot of Select Key is available. (Continuous pressing is not available.)

←, → Key : Continuous pressing is available.

 Key Operation :

Pushing "Menu" key, the OSD window will pop out. The default value will focus on the first icon.

Keep pushing "Menu" key, the highlight will go to next item. The sequence is "DISP ADJUSTMENT"menu

→ "WHITE BALANCE" menu → "COLOR ADJUSTMENT" menu → "MISC" menu.

The different icon will come out different OSD items. Using "Select" key can choose different item. The

"Decrease" and "Increase" keys will change the value for that item which is selected by "Select“ key.

 Display Message :

Message :

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ADJUSTING

NO SIGNAL

(SCREEN)

Message Displayed Position :

 Secret Key Operation :

AGING : "Menu" + "Select" + "Right(->)" and "Power" ON

VERSION : "Menu" + "Left(<-)" + "Right(->)" and "Power" ON

Version Displayed Position :

MODEL NAME : T15EX

VERSION : R00

CKS : DC12

 OSD OFF time :

 OSD Value: Each OSD value is memorized on EEPROM.

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1.2.15 : AUTO BRIGHTNESS OSDAuto: Backlight (Sensor Board) Calibrate

Menu

Press “Menu Key + Hot Key + Power Key” will enter the “FACTORY USED ONLY” menu.

Press “Select Key” to select the item.

Press “Menu Key” to execute the function.

Press “Power Key” to exit.

 This menu will set the auto backlight rank to 0 and turn on the auto mode.

 800LUX light will be mapped to LIGHT LEVEL value 31 automatically and 400LUX light will be mapped to

LIGHT LEVEL value 0 automatically.

 When exit this menu “All Reset” will be done.

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LIGHT LEVEL item: The number is response the LIGHT LEVEL value anytime. (Number range: 0~31)

Press “select key” will go to next item.

MAX: 800LUX item: This will set the maximum value for program. (HEX Number)

Put the 800Lux light to sensor board, and press “menu key” to start set value procedure. (When it’s running, the number is flashing until the procedure end.) Press “menu key” will run this procedure again. Press “select key” will go to next item.

MID: 400LUX item: This will set the middle value for program. (HEX Number)

Put the 400Lux light to sensor board, and press “menu key” to start set value procedure. (When it’s running the number is flashing until the procedure end.) Press “menu key” will run this procedure again. Press “select key” will go to next item.

MIN: 0 LUX item: This will set the minimum value for program. (HEX Number)

Put the 0Lux light to sensor board, and press “menu key” to start set value procedure. (When it’s running the number is flashing until the procedure end.) Press “menu key” will run this procedure again. Press “select key” will go to next item.

LOAD DEFAULT item: This will load default value for program.

Press “menu key” to execute this procedure.

msg* item: This will show the Warning or Error.

When (MAX-MID)<2048 it will show “Warning: small range”. If it’s happen please check the sensor board output frequency range at 0Lux, 400Lux and 800Lux, and restart set MAX, MID, MIN value again.

When (MAX-MID)<1750 it will show “ERROR”. If it’s happen please analysis the sensor board.

EXIT: Press “Power Key”, then it will exit the “FACTORY USED ONLY” and “All Reset” will be done.

Note: Normal case the value relation is MAX>MID>MIN, and (MAX-MID) should over 2048.

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Relation with LUX from Rank 0 to Rank 4.

Note : 0~31 is LIGHT LEVEL.

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1.3. HARDWARE SYSTEM BLOCK DIAGRAM

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1.4 POWER SUPPLY (AC-ADAPTER)

Model name: CAPI-208-98010M

Note 1: 68%(min.) at full load, 115Vac/60Hz Note 2: No max. limits but in hot start shall no damage & Fuse could not open.

Note 1: The ripple and regulation shall be maintained in the SPEC for all combinations of below condition:

 min. & max. output current.  min. & max. AC input voltage.  min. & max. AC input frequency.

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2.

System Assembly & Disassembly

2.1 System View

2.1.1 Front View

 Menu Button  Select Button  / Buttons  Auto Adjustment Button  Power Indicator  Power Button

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2.

System Assembly & Disassembly

2.1.2 Side View

 Microphone Input Connector  Headphone Output Connector

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2.

System Assembly & Disassembly

2.1.3 Rear View

 VESA Mounting Holes  Power Connector  Signal Cable  Latch

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2.

System Assembly & Disassembly

2.2 System Disassembly

The section discusses at length each major component for disassembly/reassembly and show corresponding illustrations.

CAUTION: Before you start to install/replace these modules, 1) Turn off the power button on the rear panel of the monitor; 2) Disconnect the power cord from the electrical outlet and then from the monitor.

NOTE: During disassembly, 1) Label each cable as you disconnect it, noting its position and routing; 2) Keep all the screws.

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2.

System Assembly & Disassembly

2.2.1 LCD Panel Disassembly

1. Remove the screw cover on the rear side of the monitor. (Figure 2-1)

2. Remove three screws. (Figure 2-2)

Figure 2-1 Figure 2-2

MiTAC 15EX-TA Troubleshooting Manual

Specifications and Main Features

Frequently Asked Questions

User Manual