NEC Multi Sync EA221WM User Manual

5-7
Fig. 2. Dark dot defect description
【two adjacent】
Fig. 3. Minimum distance between dot defects
【dark dot - to - dark dot】
【bright dot - to - bright dot】
【bright dot - to - bright dot】
(Good) (N. G)
5 mm
Good
4.9mm
N. G
15 mm
Good
14.9 mm
N. G

NEC Multi Sync EA221WM Specifications

General

Screen Size	22 inches
Resolution	1680 x 1050
Panel Type	TN
Brightness	250 cd/m²
Contrast Ratio	1000:1
Response Time	5 ms
Viewing Angle (Horizontal)	170°
Viewing Angle (Vertical)	160°
Aspect Ratio	16:10
Height Adjustment	Yes
Connectivity	VGA, DVI-D
Built-in Speakers	Yes
Power Consumption	1W (standby)

Summary

1. Safety guideline in servicing

3. Caution for LEAD-FREE soldering work

2. TROUBLE SHOOTING

2.1 No Power

Guides users through diagnosing and resolving issues related to the monitor not powering on.

2.2 No Video (LED indicator orange)

Provides steps to troubleshoot and fix problems where the monitor displays no video with an orange LED indicator.

2.3 No Display (LED indicator green)

Offers solutions for when the monitor has no display despite the green LED indicator being lit.

2.4 Image overlap, focus or flicker

Addresses common display issues like image overlap, focus problems, and flickering, offering diagnostic steps.

2.5 Brightness defect

Details troubleshooting procedures for issues related to incorrect or absent screen brightness.

2.6 Color defect (Missing color(R, G, B)) / White balance defect

Provides guidance on diagnosing and resolving color reproduction problems and white balance issues.

2.7 Line defect / Block defect

Guides users on identifying and fixing display issues characterized by lines or block patterns.

2.8 Partially color / Brightness uneven

Covers troubleshooting for partial color issues and uneven screen brightness distribution.

2.9 Dot defect (Bright dot / Dark dot)

Explains how to identify and resolve display defects related to individual bright or dark pixels.

2.10 Audible defect (No sound or Noise etc.)

2.11 USB doesn't function.

3. DISASSEMBLY

4. ADJUSTMENT

4.4 ADC Bias and Gain Adjust

4.5 Adjustment of White Balance

4.8 Special key operation

5. Inspection

5.1 Electric Performance Inspection

5.2 Check for the received recommended frequency

5.3 Check the performance

5.5 External Inspection on the LCD Module

5.7 Visual Inspection

5.8 Electrical Inspection

6. Writing of EDID/OSD (Monitor Information) data

6.1 Writing of EDID data

Guides on writing Extended Display Identification Data (EDID) for proper monitor communication.

6.2 OSD "MONITOR INFORMATION" for Serial Number

Explains how to write the serial number into the monitor's OSD information.