Envision EN-7220 Manual de usuario

EN7220 Service Manual

SERVICE MANUAL

17” LCD Monitor

THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE

EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT

GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION

AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.

Manufacture Date:Apr-09-04

EN7220 Service Manual

Table of Contents

Table of Contents ---------------------------------------------------------------------- 02

Revision List ---------------------------------------------------------------------------- 04

1. Monitor Specification --------------------------------------------------------------05

2. LCD Monitor Description ---------------------------------------------------------05

3. Operation Instructions -------------------------------------------------------------06

3.1 General Instructions -----------------------------------------------------------06

3.2 Adjusting The Picture ---------------------------------------------------------06

4. Input/Output Specification ------------------------------------------------------- 08

4.1 Input Signal Connector -------------------------------------------------------08

4.2 Factory Preset Display Modes ---------------------------------------------09

4.3 Power Supply Requirements -----------------------------------------------10

4.3.1 Input/Output Requirements --------------------------------------------10

4.3.2 Inverter Max Brightness ------------------------------------------------10

4.3.3 Inverter Min Brightness -------------------------------------------------10

4.4 Panel Specification (QDI L07) ----------------------------------------11

4.4.1 Display Characteristics -------------------------------------------------11

4.4.2 Optical Characteristics ------------------------------------------------12

4.4.3 Parameter guide line for CCFL Inverter -------------------------12

5. Block Diagram -----------------------------------------------------------------------13

5.1 Monitor Exploded View -----------------------------------------------------13

5.2 Software Flow Chart -----------------------------------------------------------14

EN7220 Service Manual

5.3 Electrical Block Diagram -----------------------------------------------------16

5.3.1 Scalar Board --------------------------------------------------------------16

5.3.2 Inverter/Power Board ---------------------------------------------------17

6. Schematic ----------------------------------------------------------------------------19

6.1 Scalar Board --------------------------------------------------------------------19

6.2 Inverter/Power Board ------------------------------------------------------22

6.3 Key Pad Board -----------------------------------------------------------------24

7. PCB Layout --------------------------------------------------------------------------25

7.1 Main Board ---------------------------------------------------------------------25

7.2 Inverter/Power Board --------------------------------------------------------26

7.3 Keypad Board -----------------------------------------------------------------26

8. Maintainability -----------------------------------------------------------------------27

8.1 Equipments and Tools Requirements -----------------------------------27

8.2 Trouble Shooting -------------------------------------------------------------28

8.2.1 Main Board -------------------------------------------------------------28

8.2.2 Power/Inverter Board --------------------------------------------------31

8.2.3 Key Pad Board ------------------------------------------------------------33

9. White-Balance, Luminance Adjustment ---------------------------------------34

10. EDID Content ----------------------------------------------------------------------35

11. BOM List ---------------------------------------------------------------------36～50

EN7220 Service Manual

1. MONITOR SPECIFICATIONS

Driving system TFT Color LCD

LCD Panel Size 43.2cm(17.0")

Pixel pitch 0.264mm( H )x 0.264mm( V )

Viewable angle 140˚(H) 130˚(V)

Response time (typ.) 25 ms

Video Analog

Input Sync. Type H/V TTL

H-Frequency 30kHz – 80kHz

V-Frequency 55-75Hz

Display Colors Over 16 million Colors

Dot Clock 135MHz

Max. Resolution 1280 x 1024

Plug & Play VESA DDC2BTM

Power Consumption ON Mode

<45W

OFF Mode

<3W

Maximum Screen Size Horizontal : 13.3”(337.92mm)

Vertical : 10.6”(270.336mm)

Power Source 100~240VAC,47~63Hz

Environmental

Considerations

Operating Temp: 0°C to 40°C

Storage Temp.: -20°C to 60°C

Operating Humidity : 15% to 90%

Weight (N. W.) Packaged 7.4Kgs Unit

Unpackaged 6.6Kgs Unit

EN7220 Service Manual

2. LCD MONITOR DESCRIPTION

The LCD MONITOR will contain an main board, an inverter/power board, keypad board and internal

adapter which house the flat panel control logic, brightness control logic and DDC.

The Inverter board will drive the backlight of panel and the DC-DC conversion.

Power board

(

include:ada

ter,inverter

)

Flat Panel and

CCFL backlight

Main Board

Keyboard

RS232 Connector

For white balance

adjustment in

factory mode

HOST Computer

CCFT Drive.

AC-IN

100V-240V Video signal, DDC

Monitor Block Diagram

EN7220 Service Manual

3. OPERATING INSTRUCTIONS

3.1 GENERAL INSTRUCTIONS

Press the power button to turn the monitor on or off. The other control buttons are located at front

panel of the monitor. By changing these settings, the picture can be adjusted to your personal

preferences.

-The power cord should be connected.

-Connect the video cable from the monitor to the video card.

-Press the power button to turn on the monitor, the power indicator will light up.

3.2 Adjusting the Picture

The descriptions for function control LEDS

Main Menu

Item

Main

Icon

Sub Menu

Item

Sub Menu

Icon Description Adjust

Range Reset Value

Contrast Contrast from Digital-register. 0-100 Recall Cool

Contrast Value

Luminance Brightness Backlight Adjustment 0-100 Recall Cool

Brightness Value

Focus

Adjust Picture Phase to reduce

Horizontal-Line noise 0-100 Do Auto Config

Image Setup Clock

Adjust picture Clock to reduce

Vertical-Line noise. 0-100 Do Auto Config

H. Position

Adjust the horizontal position of

the picture. 0-100 Do Auto Config

Image

Position V. Position

Adjust the vertical position of the

picture. 0-100 Do Auto Config

Warm N/A

Recall Warm Color Temperature

from EEPROM. N/A

Color Temp.

Cool N/A

Recall Cool Color Temperature

from EEPROM. N/A

The Color

Temperature will

be set to Cool.

EN7220 Service Manual

User / Red Red Gain from Digital-register. 0-100

User /

Green Green Gain Digital-register. 0-100

User / Blue Blue Gain from Digital-register. 0-100

The User R/G/B

value(default is

100) will not be

Modified by Reset

function.

Yes

N/A Auto Adjust the H/V Position,

Focus and Clock of picture. N/A N/AAuto Config

(Analog-Onl

y Model) No N/A

Do not execute Auto Config,

return to main menu. N/A N/A

H. Position

Adjust the horizontal position of

the OSD. 0-100 50

V. Position

Adjust the vertical position of the

OSD. 0-100 50

OSD Setup

OSD

Timeout Adjust the OSD timeout. 10-120 10

English N/A

Set OSD display language to

English. N/A

Deutsch N/A Set OSD display language to

German. N/A

Français N/A Set OSD display language to

French. N/A

Español N/A Set OSD display language to

Spain. N/A

Italiano N/A

Set OSD display language to

Italian. N/A

Language

简体中文 N/A Set OSD display language to

Simplified Chinese. N/A

The Language

will be set to

English.

Information Information N/A

Show the resolution, H/V

frequency and input port of

current input timing.

N/A N/A

Yes N/A

Clear each old status of

Auto-configuration and set the

color temperature to Cool.

N/A N/A

Reset

No N/A

Do not execute reset, return to

main menu. N/A N/A

Exit N/A N/A Exit OSD N/A N/A

EN7220 Service Manual

4. Input/Output Specification

4.1 Input Signal Connector

PIN NO.

DESCRIPTION

PI N NO.

DESCRIPTION

1. Red 9. +5V

2. Green 10. Detect Cable

3. Blue 11. NC

4. Ground 12. DDC-Serial Data

5. Ground 13. H-Sync

6. R-Ground 14. V-Sync

7. G-Ground 15. DDC-Serial Clock

8. B-Ground

VGA connector layout

610

11 15

EN7220 Service Manual

4.2 Factory Preset Display Modes VESA MODES

Horizontal Vertical

Mode Resolution Total

Nominal

Frequenc

+/-

0.5kHz

Sync

Polarity

Nominal

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175

640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500

VGA

640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500

800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000

800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000

800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000

SVGA

800x600@75Hz 1056x625 46.875 P 75.000 P 49.500

1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000

1024x768@60Hz 1312x813 48.78 N 60.00 N 64.000

1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000

1024x768@72Hz 1304x798 57.515 P 72.074 P 75.000

1024x768@75Hz 1328x804 60.200 N 74.90 N 80.000

XGA

1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750

XGA 1152x864@75Hz 1600x900 67.50 P 75.000 P 108.000

1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000

SXGA 1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000

IBM MODES

Horizontal Vertical

Mode Resolution Total

Nominal

Frequenc

+/-

0.5kHz

Sync

Polarity

Nominal

Freq.

+/- 1 Hz

Sync

Polarity

Nominal

Pixel

Clock

(MHz)

DOS* 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322

DOS** 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175

MAC MODES

VGA

640x480@67Hz 864x525 35.000 N 66.667 N 30.240

SVGA

832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832

EN7220 Service Manual

4.3 Power Supply Requirements

4.3.1 Input Requirements

INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120KΩX4(ROOM TEMPERATURE 25℃±4℃)

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

Input voltage Vin 10.8 12 13.2 V

Input current Iin 2250 2500 mA FOR 4 LOAD

Output Current Iout 6.0 6.5 7.0 mA FOR 1 LOAD

Frequency F 50.0 55.0 60.0 KHZ

FOR 1 LOAD

H.V open Vopen 1450 1600 1750 Vrms NO LOAD

H.V Load Vload 710 810 910 Vrms RL=120KΩ

Start voltage Vst 1650 1750 1850 Vrms RL=CCFL

Protect delay time PDT 0.4 1 4 Sec

4.3.2 Output Requirements

INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=120KΩX4(ROOM TEMPERATURE 25℃±4℃)

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

Input voltage Vin 10.8 12 13.2 V

Input current Iin 660 750 mA FOR 4 LOAD

Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD

Frequency F 50.0 55.0 60.0 KHZ

FOR 1 LOAD

H.V open Vopen 1450 1600 1750 Vrms NO LOAD

Start voltage Vst 1650 1750 1850 Vrms RL=CCFL

H.V Load Vload 350 450 550 Vrms RL=120KΩ

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