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
1
EN7220 Service Manual
Table of Contents |
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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 ------------------------------------------------- |
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4.4.2 Optical Characteristics ------------------------------------------------ |
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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 |
2
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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 |
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EN7220 Service Manual |
1. MONITOR SPECIFICATIONS |
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Driving system |
TFT Color LCD |
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LCD Panel |
Size |
43.2cm(17.0") |
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Pixel pitch |
0.264mm( H )x 0.264mm( V ) |
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Viewable angle |
140˚ (H) 130˚ (V) |
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Response time (typ.) |
25 ms |
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Video |
Analog |
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Input |
Sync. Type |
H/V TTL |
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H-Frequency |
30kHz – 80kHz |
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V-Frequency |
55-75Hz |
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Display Colors |
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Over 16 million Colors |
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Dot Clock |
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135MHz |
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Max. Resolution |
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1280 x 1024 |
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Plug & Play |
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VESA DDC2BTM |
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Power Consumption |
ON Mode |
<45W |
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OFF Mode |
<3W |
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Maximum Screen Size |
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Horizontal : 13.3”(337.92mm) |
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Vertical : 10.6”(270.336mm) |
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Power Source |
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100~240VAC,47~63Hz |
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Environmental |
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Operating Temp: 0°C to 40°C |
Considerations |
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Storage Temp.: -20°C to 60°C |
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Operating Humidity : 15% to 90% |
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Weight (N. W.) |
Packaged |
7.4Kgs Unit |
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Unpackaged |
6.6Kgs Unit |
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4
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.
Monitor Block Diagram
CCFT Drive. |
Flat Panel and |
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CCFL backlight |
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Power board |
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RS232 Connector |
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(include:adapter,inverter)) |
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Main Board |
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For white balance |
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adjustment in |
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factory mode |
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Keyboard |
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AC-IN |
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HOST Computer |
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Video signal, DDC |
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100V-240V |
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5
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.
3.2Adjusting the Picture
The descriptions for function control LEDS
Main Menu |
Main |
Sub Menu |
Sub Menu |
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Adjust |
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Menu |
Description |
Reset Value |
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Item |
Icon |
Item |
Icon |
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Range |
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Contrast |
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Contrast from Digital-register. |
0-100 |
Recall Cool |
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Contrast Value |
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Luminance |
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Brightness |
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Backlight Adjustment |
0-100 |
Recall Cool |
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Brightness Value |
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Focus |
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Adjust Picture Phase to reduce |
0-100 |
Do Auto Config |
Image Setup |
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Horizontal-Line noise |
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Clock |
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Adjust picture Clock to reduce |
0-100 |
Do Auto Config |
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Vertical-Line noise. |
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Image |
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H. Position |
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Adjust the horizontal position of |
0-100 |
Do Auto Config |
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the picture. |
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Position |
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V. Position |
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Adjust the vertical position of the |
0-100 |
Do Auto Config |
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picture. |
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Color Temp. |
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Warm |
N/A |
Recall Warm Color Temperature |
N/A |
The Color |
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from EEPROM. |
Temperature will |
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Cool |
N/A |
Recall Cool Color Temperature |
N/A |
be set to Cool. |
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from EEPROM. |
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6
EN7220 Service Manual
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User / Red |
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Red Gain from Digital-register. |
0-100 |
The User R/G/B |
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value(default is |
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100) will not be |
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User / |
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Green Gain Digital-register. |
0-100 |
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Green |
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Modified by Reset |
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User / Blue |
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Blue Gain from Digital-register. |
0-100 |
function. |
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Auto Config |
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Yes |
N/A |
Auto Adjust the H/V Position, |
N/A |
N/A |
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Focus and Clock of picture. |
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(Analog-Onl |
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Do not execute Auto Config, |
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y Model) |
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No |
N/A |
N/A |
N/A |
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return to main menu. |
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H. Position |
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Adjust the horizontal position of |
0-100 |
50 |
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the OSD. |
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OSD Setup |
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V. Position |
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Adjust the vertical position of the |
0-100 |
50 |
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OSD. |
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OSD |
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Adjust the OSD timeout. |
10-120 |
10 |
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Timeout |
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English |
N/A |
Set OSD display language to |
N/A |
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English. |
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Deutsch |
N/A |
Set OSD display language to |
N/A |
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German. |
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Français |
N/A |
Set OSD display language to |
N/A |
The Language |
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French. |
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Language |
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will be set to |
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Set OSD display language to |
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Español |
N/A |
N/A |
English. |
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Spain. |
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Italiano |
N/A |
Set OSD display language to |
N/A |
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Italian. |
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N/A |
Set OSD display language to |
N/A |
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Simplified Chinese. |
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Show the resolution, H/V |
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Information |
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Information |
N/A |
frequency and input port of |
N/A |
N/A |
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current input timing. |
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Clear each old status of |
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Yes |
N/A |
Auto-configuration and set the |
N/A |
N/A |
Reset |
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color temperature to Cool. |
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No |
N/A |
Do not execute reset, return to |
N/A |
N/A |
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main menu. |
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Exit |
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N/A |
N/A |
Exit OSD |
N/A |
N/A |
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7
EN7220 Service Manual
4. Input/Output Specification
4.1 Input Signal Connector
PIN NO. |
DESCRIPTION |
PI N NO. |
DESCRIPTION |
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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
1 |
5 |
6 |
10 |
11 |
15 |
8
EN7220 Service Manual
4.2 Factory Preset Display Modes
VESA MODES
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Horizontal |
Vertical |
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Nominal |
Sync |
Nominal |
Sync |
Nominal |
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Frequenc |
Polarity |
Freq. |
Polarity |
Pixel |
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Mode |
Resolution |
Total |
y |
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+/- 1 Hz |
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Clock |
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+/- |
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(MHz) |
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0.5kHz |
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640x480@60Hz |
800 x 525 |
31.469 |
N |
59.940 |
N |
25.175 |
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VGA |
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640x480@72Hz |
832 x 520 |
37.861 |
N |
72.809 |
N |
31.500 |
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640x480@75Hz |
840 x 500 |
37.500 |
N |
75.00 |
N |
31.500 |
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800x600@56Hz |
1024 x 625 |
35.156 |
N/P |
56.250 |
N/P |
36.000 |
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SVGA |
800x600@60Hz |
1056 x 628 |
37.879 |
P |
60.317 |
P |
40.000 |
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800x600@72Hz |
1040 x 666 |
48.077 |
P |
72.188 |
P |
50.000 |
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800x600@75Hz |
1056x625 |
46.875 |
P |
75.000 |
P |
49.500 |
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1024x768@60Hz |
1344x806 |
48.363 |
N |
60.004 |
N |
65.000 |
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1024x768@60Hz |
1312x813 |
48.78 |
N |
60.00 |
N |
64.000 |
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XGA |
1024x768@70Hz |
1328x806 |
56.476 |
N |
70.069 |
N |
75.000 |
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1024x768@72Hz |
1304x798 |
57.515 |
P |
72.074 |
P |
75.000 |
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1024x768@75Hz |
1328x804 |
60.200 |
N |
74.90 |
N |
80.000 |
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1024x768@75Hz |
1312x800 |
60.023 |
P |
75.029 |
P |
78.750 |
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XGA |
1152x864@75Hz |
1600x900 |
67.50 |
P |
75.000 |
P |
108.000 |
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SXGA |
1280x1024@60Hz |
1688x1066 |
63.981 |
P |
60.020 |
P |
108.000 |
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1280x1024@75Hz |
1688x1066 |
79.976 |
P |
75.025 |
P |
135.000 |
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IBM MODES |
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Horizontal |
Vertical |
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Nominal |
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Nominal |
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Frequenc |
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Nominal |
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Sync |
Sync |
Pixel |
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Mode |
Resolution |
Total |
y |
Freq. |
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Polarity |
Polarity |
Clock |
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+/- |
+/- 1 Hz |
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(MHz) |
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0.5kHz |
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DOS* |
720x400@70Hz |
900 x 449 |
31.469 |
N |
70.087 |
P |
28.322 |
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DOS** |
640x400@70Hz |
800 x 449 |
31.469 |
N |
70.087 |
P |
25.175 |
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MAC MODES |
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VGA |
640x480@67Hz |
864x525 |
35.000 |
N |
66.667 |
N |
30.240 |
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SVGA |
832x624@75Hz |
1152x667 |
49.725 |
N |
74.551 |
N |
57.2832 |
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9
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 |
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Input voltage |
Vin |
10.8 |
12 |
13.2 |
V |
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Input current |
Iin |
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2250 |
2500 |
mA |
FOR 4 LOAD |
Output Current |
Iout |
6.0 |
6.5 |
7.0 |
mA |
FOR 1 LOAD |
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Frequency |
F |
50.0 |
55.0 |
60.0 |
KHZ |
FOR 1 LOAD |
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H.V open |
Vopen |
1450 |
1600 |
1750 |
Vrms |
NO LOAD |
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H.V Load |
Vload |
710 |
810 |
910 |
Vrms |
RL=120KΩ |
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Start voltage |
Vst |
1650 |
1750 |
1850 |
Vrms |
RL=CCFL |
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Protect delay time |
PDT |
0.4 |
1 |
4 |
Sec |
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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 |
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Input current |
Iin |
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660 |
750 |
mA |
FOR 4 LOAD |
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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 |
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H.V open |
Vopen |
1450 |
1600 |
1750 |
Vrms |
NO LOAD |
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Start voltage |
Vst |
1650 |
1750 |
1850 |
Vrms |
RL=CCFL |
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H.V Load |
Vload |
350 |
450 |
550 |
Vrms |
RL=120KΩ |
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10
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EN7220 Service Manual |
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4.4 Panel Specification (QDI L07) |
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4.4.1 Display Characteristics |
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PARAMETER |
SPECIFICATION |
UNIT |
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Display Size |
43(17") Diagonal |
cm |
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Active area |
337.9(H) x 270.3(V) |
mm |
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Pixel format |
1280(H) x 1024(V) |
pixel |
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(1 Pixel=R+G+B dots) |
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Pixel pitch |
0.264(H) x 0.264(V) |
mm |
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Pixel configuration |
R, G, B vertical stripe |
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Display mode |
Normally White |
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Unit outline dimensions (typ.)*1 |
358.5 x 296.5x 16.5 |
mm |
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weight |
1970(Max.) |
g |
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Surface treatment |
Anti-glare and hard-coating 3H |
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Low reflection (~ 5%) |
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Lamp Quantity |
4 |
pcs |
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4.4.2 Optical Characteristics
The optical characteristics are measured under stable conditions at 25 (Room Temperature)
Parameter |
Symbol |
Condition |
Min |
Typ. |
Max. |
Unit |
Remark |
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Horizontal |
θ21, θ22 |
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65 |
75 |
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Deg |
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Vertical |
θ11 |
CR>10 |
55 |
65 |
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Deg |
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Viewing angle |
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θ12 |
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50 |
60 |
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Deg |
Note1,4 |
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range |
Horizontal |
θ21, θ22 |
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85 |
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Deg |
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Vertical |
θ11 |
CR>5 |
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75 |
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Deg |
|
|
|
|
|
|
|
|
|
|
|
θ12 |
|
|
70 |
|
Deg |
|
|
|
|
|
|
|
|
|||
Contrast ratio |
CR |
θ=0° |
300 |
450 |
— |
|
Note2, 4 |
|
Response time |
t |
θ=0° |
— |
20 |
|
ms |
|
|
Rise time |
tr |
|
|
|
4 |
|
ms |
Note3, 4 |
Fall time |
td |
|
|
|
16 |
|
ms |
|
Chromaticity of White(CIE 1931) |
Wx |
|
0.283 |
0.313 |
0.343 |
|
Note4 |
|
Wy |
|
0.299 |
0.329 |
0.359 |
|
|
||
|
|
|
|
|
||||
Chromaticity of Red(CIE 1931) |
Rx |
|
0.603 |
0.633 |
0.663 |
|
|
|
Ry |
|
0.306 |
0.336 |
0.366 |
|
|
||
|
|
|
|
|
||||
Chromaticity of Green(CIE 1931) |
Gx |
|
0.270 |
0.300 |
0.330 |
|
|
11
|
|
|
|
|
EN7220 Service Manual |
||
|
Gy |
|
0.556 |
0.586 |
0.616 |
|
|
|
|
|
|
|
|
|
|
Chromaticity of Blue(CIE 1931) |
Bx |
|
0.116 |
0.146 |
0.176 |
|
|
By |
|
0.073 |
0.103 |
0.133 |
|
|
|
|
|
|
|
||||
Luminance of white |
YL |
|
240 |
300 |
|
cd/ |
IL=7.0 |
Note 4[Note 4] |
|
|
mArms |
||||
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
White Uniformity |
δw |
|
— |
1.25 |
1.33 |
|
Note5 |
Cross talk |
|
|
|
|
1.50% |
|
Note6 |
4.4.3 Parameter Guide for CFL Inverter
The backlight system is an edge-lighting type with 2- CCFL(Cold Cathode Fluorescent Lamp).
The characteristics of four lamps are shown in the following tables.
PARAMETER |
SYMBOL |
MIN |
TYP |
MAX |
UNIT |
REMARK |
|
Lamp current range |
IL |
3.0 |
7.0 |
8.0 |
mArms |
Note1 |
|
|
|
|
|
|
|
|
|
Lamp voltage |
VL |
|
725 |
|
Vrms |
|
|
Lamp power consumption |
PL |
|
5.1 |
|
W |
Note2 IL=7.0mA |
|
Lamp frequency |
FL |
|
52 |
|
kHz |
Note3 |
|
|
|
|
|
|
|
|
|
Established starting voltage |
Vs |
|
|
1100 |
Vrms |
Ta=25 |
Note4 |
|
|
1420 |
Vrms |
Ta=0 |
|||
Lamp life time |
LL |
40000 |
50000 |
|
hour |
Note5 |
|
|
|
|
|
|
|
|
|
12
EN7220 Service Manual
5.2 Software Flow Chart
1
2 Y 3
N
4
5 N
Y
6
7 N 8
Y
9
10 |
N |
11 |
|
Y |
|
|
|
N 12 |
|
13 |
N |
Y |
Y |
|
|
14 |
|
15 |
N 16 |
|
|
Y |
|
|
|
17 |
|
18 |
N 19 |
|
Y |
14
EN7220 Service Manual
1)MCU initialize.
2)Is the eeprom blank ?
3)Program the eeprom by default values.
4)Get the PWM value of brightness from eeprom.
5)Is the power key pressed ?
6)Clear all global flags.
7)Are the AUTO and SELECT keys pressed ?
8)Enter factory mode.
9)Save the power key status into eeprom. Turn on the LED and set it to green color. Scaler initialize.
10)In standby mode ?
11)Update the life time of back light.
12)Check the analog port, are there any signals coming ?
13)Does the scalar send out a interrupt request ?
14)Wake up the scalar.
15)Are there any signals coming from analog port ?
16)Display "No connection Check Signal Cable" message. And go into standby mode after the message disappear.
17)Program the scalar to be able to show the coming mode.
18)Process the OSD display.
19)Read the keyboard. Is the power key pressed ?
15
EN7220 Service Manual
5.3 Electrical Block Diagram
5.3.1 Main Board
16