NEC Multi Sync EA221WM User manual

COLOR MONITOR Multi Sync EA221WM
MODELS: EA221WM-BK (A)
EA221WM (B)/EA221WM-BK (B)
EA221WM (J)/EA221WM (BK) (J)
3rd Edition
NEC DISPLAY SOLUTIONS, LTD.
201006
08HR4LAN 08HR3LBN
08HR4LBN 08HR3LJN
08HR4LJN 08HR7LBW
08HR8LBW 08HR2GAN
08HR1GBN 08HR2GBN
08HRTLAN
PART NO. 599910918
SERVICE MANUAL

When EA221WM is repaired, this manual is the description of the necessary matter.
VERY IMPORTANT!
This Equipment is compatible with RoHS Directive and Lead-Free.
Since the equipment is compatible with RoHS Directive, use components in which the use of specific
chemically noxious substances is restricted; use only designated spare parts when it is necessary to
replace such parts with new parts.
Use lead-free solder for the equipment compatible with ones with substrates on which lead-free
components are mounted. For the details, refer to “Caution for Lead-Free Soldering Work” given in the
next page.
This model has four types of LCD panel.
●The panel type manufactured by LG (LM220WE1-TLD1)
●The panel type manufactured by LG (LM220WE1- TLE3)
●The panel type manufactured by SEC (LTM220M1-L01)
●The panel type manufactured by LG (LM220WE1-TLP1)
Prior to servicing the unit, confirm the serial number of the unit.
The classification code of the serial number is [0, 1].
The classification code of the serial number is [2, 3].
The classification code of the serial number is [6, 7].
The classification code of the serial number is [B].

1. Safety guideline in servicing
1) Never touch the portions with the marking ( ).
2) Do not expose the set to rain or water.
A risk of fire or electric shock can result.
3) Use an adequate power cord.
A risk of fire or electric shock can result.
4) Do not attempt to service or modify the set without prior permission of the manufacturer.
A risk of fire or electric shock can result.
5) Leave the maintenance service to a service engineer having qualification, knowledge and experience.
A risk of electric shock, injury or fire can result.
6) Always employ genuine parts indicated in the service manual for replacement.
A risk of fire or electric shock can result.
7) Confirm the connection of the power supply connector earth cable in reassembling. (Soldering or Screw
fixation)
A risk of fire or electric shock can result.
8) Use the specified binding bands, clampers, tubes and barriers--all of which are necessary for
insulation/protection--in their original positions in reassembling.
A risk of fire or electric shock can result.
9) Other complete parts are returned to an appropriate position.
2. Other cautions necessary
1) When removing the cables from their connectors, take care not to damage the wire portions so as to prevent the
occurrence of poor contact.
2) When attaching/detaching screws, use a screwdriver that is well-fit to the screw size.

3. Caution for LEAD-FREE soldering work
For this equipment, parts compatible with lead-free materials are used. Please observe the following precautions,
when performing any soldering work.
1) Use lead-free solder for substrates mounted with lead-free parts. If you use eutectic solder by mistake, solder will
not fuse well because of the difference in fusion point.
2) Fusion Point
Lead-free solder: 220°C
Eutectic solder: 183°C
3) Solder composition of Lead-free solder: Sn-3.0Ag-0.5Cu
[Maker ] [Type]
Nihon Genma DHB-RMA NP303-###
Senju metal ESC F3 M705E-###
(#: This mark shows the diameter of the solder wire.)
4) When working with lead-free solder always use a temperature adjustable soldering iron. Moreover, the power
consumption of the soldering iron must use from 25W to 75W.
[Solder Iron tip temperature and contact time]
Category of Parts Lead-free solder Eutectic solder
*SMD Chip The Parts of Chip type 300-320°C(1-3sec) 260-280°C(1-3sec)
*SMD QFP The Parts (IC) of Quad Flat Pack Package type 320-350°C(1-3sec) 280-300°C(1-3sec)
Heat sink Heat sink 360-380°C(1-3sec) 320-420°C(1-3sec)
The Parts of Axial or Radial type
(The Electric Parts other than the above-mentioned.
Ax, RD
Ex.: IC, Transistor, Resistor, Capacitor)
340-370°C(1-3sec) 350-390°C(1-3sec)

Procedure of monitor repair
Confirmation of
monitor version
Confirmation of
defective parts
Replacement of
defective parts
What are
replacement
parts ?
Writing of EDID/OSD data
Adjustment of monitor
Inspection of monitor
“SWAP” or “Repair and Return”?
Was MAIN PWB
replacement ?
Was LCD panel
replacement?
Was Other parts
replacement ?
1. SERIAL NUMBER INFORMATION
2. TROUBLE SHOOTING
3. DISASSEMBLY
4. ADJUSTMENT PROCEDURES
5. INSPECTION PROCEDURES
6. Writing of EDID/OSD (Monitor Information) data
Electric parts
Yes
Yes
Yes
1 2
SWAP
Repair and Return
Appearance parts
or No
(
NPF
)

[Repair and Return]
[SWAP]
1
Was MAIN PWB
replacement?
Shipment setting Factory preset Repair completion
Yes
No
7. SHIPMENT SETTING OSD User menu
2
Shipment setting Factory preset Repair completion
7. SHIPMENT SETTING OSD User menu

CONTENTS
1. SERIAL NUMBER INFORMATION .................................................... 1-1
2. TROUBLE SHOOTING ...................................................................... 2-1
3. DISASSEMBLY .................................................................................. 3-1
4. ADJUSTMENT PROCEDURES ......................................................... 4-1
5. INSPECTION PROCEDURES ............................................................ 5-1
6. Writing of EDID/OSD (Monitor Information) data ............................ 6-1
7. SHIPMENT SETTING........................................................................... 7-1
8. PACKING SPECIFICATION ............................................................... 8-1
9. REVISION HISTORY .......................................................................…9-1

1-1
1. Serial Number Information
Refer to the serial number information shown below.
EX.) SERIAL NUMBER LABEL
(1):ManufacturedYear (3):Classificationcode (9):FactoryCode
(2): Manufactured Month (4) ~ (8): Running number (10): Control Code
MODEL:
SERIAL NO.: gggggggggg
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
January to September: 1 to 9
October: X
November: Y
December: Z
This running number does not reset at each month. For A ver. (U.S/Asia/Australia.): A
For B ver. (Europe/Asia/Australia.): B
For J ver. (Japan): J
TPV China factory: N
Czech Tatung :W
Discriminate by cabinet colorLast digit
(□) Panel code

1-2
MODEL Panel Code (3) (9) (10) LCD Panel RoHS Vista
EA221WM-BK (L) 1(Black) N(TPV China Factory) A(USA) LM220WE1-TLD1 Yes Yes
EA221WM (L) 0(White) N(TPV China Factory)
W (Czech Tatung) B(Europe) LM220WE1-TLD1 Yes Yes
EA221WM-BK (L) 1(Black) N(TPV China Factory)
W (Czech Tatung) B(Europe) LM220WE1-TLD1 Yes Yes
EA221WM (L) 0(White) N(TPV China Factory) J(Japan) LM220WE1-TLD1 Yes Yes
EA221WM(BK) (L) 1(Black) N(TPV China Factory) J(Japan) LM220WE1-TLD1 Yes Yes
EA221WM-BK (L) 3(Black) N(TPV China Factory) A(USA) LM220WE1-TLE3 Yes Yes
EA221WM (L) 2(White) N(TPV China Factory)
W (Czech Tatung) B(Europe) LM220WE1-TLE3 Yes Yes
EA221WM-BK (L) 3(Black) N(TPV China Factory)
W (Czech Tatung) B(Europe) LM220WE1-TLE3 Yes Yes
EA221WM (L) 2(White) N(TPV China Factory) J(Japan) LM220WE1-TLE3 Yes Yes
EA221WM(BK) (L) 3(Black) N(TPV China Factory) J(Japan) LM220WE1-TLE3 Yes Yes
EA221WM-BK (S) 7(Black) N(TPV China Factory) A(USA) LTM220M1-L01 Yes Yes
EA221WM (S) 6(White) N(TPV China Factory) B(Europe) LTM220M1-L01 Yes Yes
EA221WM-BK (S) 7(Black) N(TPV China Factory) B(Europe) LTM220M1-L01 Yes Yes
EA221WM-BK (L) B(Black) N(TPV China Factory) A(USA) LM220WE1-TLP1 Yes Yes

2-1
2. TROUBLE SHOOTING
2.1 No Power
NG
OK
NG
Check the AC power.
NG
OK
The power supply equipment is
confirmed.
The power on/off switch
is turned on.
Loosening of the power supply
connector is checked.
Check connections of
POWER PWB or MAIN PWB.
No Power
OK
NG
OK
Replace AC power cable or AC inlet.
Replace the POWER PWB. OK
NG
The cable connector is inserted.
NG
End
Replace the MAIN PWB.

2-2
2.2 No Video (LED indicator orange)
NG
OK
The power on/off switch
is turned on.
OK
NG
Replace the PC.
Check the PC.
Check the signal cable.
No Video (LED indicator orange)
OK
NG
Replace signal cable.
Check connections of POWER PWB
or MAIN PWB.
OK
NG
The cable connector is inserted.
End
OK
NG
Replace the POWER PWB.
Replace the MAIN PWB.
OK

2-3
2.3 No Display (LED indicator green)
NG
OK
The power on/off switch is
turned on.
OK Select the Input Source (Active).
Check the Input Source.
Is "PC" or "Monitor" in the
state of Screen savers or
power save mode?
No Display (LED indicator green)
NO
Check the position of contrast
and brightness volume.
YES
1 3
Screen savers or power save
mode is made clear.
Adjust the contrast and brightness
or Factory Reset.
Does the backlight light? NO
YES
NG
YES
NO
Check connections of
INVERTER Cable.
The cable connector
is inserted.
2
NG
OK

2-4
Check connections of MAIN PWB
or POWER PWB or FFC Cable.
NG
OK
Replace the MAIN PWB. OK
NG
Replace the POWER PWB. OK
NG
Replace the LCD panel.
1 3
Replace the LCD panel.
2
Replace the POWER PWB.
NG
OK
OK
The cable connector is
inserted.
End
Replace the FFC Cable.
OK
NG
OK

2-5
2.4 Image overlap, focus or flicker
Recommended frequency EA221WM: 1680×1050@60Hz
OK
NG
NG
End
Factory Reset is executed.
NG
Is the input signal proper?
Readjust the auto adjusts or clock
phase in the OSD user menu.
Replace MAIN PWB.
Image overlap, focus or flicker, color defect
NG
OK
NG
OK
Replace the LCD panel.
Change the resolution to
recommended frequency.
OK
OK
OK

2-6
2.5 Brightness defect
OK
NG
End
Factory Reset is executed.
Replace the MAIN PWB.
NG
OK
“Brightness” of the OSD
menu is adjusted.
Replace the LCD panel.
Brightness defect
NG
OK
OK

2-7
2.6 Color defect (Missing color(R, G, B)) / White balance defect
OK
NG
End
Factory Reset is executed.
Replace the LCD panel.
NG
OK
“R, G, B” of the OSD menu
is adjusted.
Replace the MAIN PWB.
Color defect (Missing color(R, G, B))/
White balance defect
NG
OK
OK
Replace signal cable
NG
Check the signal cable.
OK

2-8
2.7 Line defect / Block defect
[Line defect] [Block defect]
2.8 Partially color / Brightness uneven
Line defect / Block defect
OK
End
Replace the MAIN PWB.
Replace the LCD panel.
NG
OK
Partially color / Brightness uneven
End
Replace the LCD panel.

2-9
2.9 Dot defect (Bright dot / Dark dot)
*1) The judgment of the dot defect is confirmed from the service manual.
Dot defect (Bright dot / Dark dot)
YES
End
Replace the LCD panel.
Is the dot defect in the
standard?
(
*1
)
NO
OK

2-10
2.10 Audible defect (No sound or Noise etc.)
OK
NG
End
Check the position of sound
volume or mute function.
Replace the SPEAKER.
OK
NG
Audible defect
(No sound or Noise etc.)
NG
OK
OK
Check connections of AUDIO
PWB or MAIN PWB or SPEAKER.
Replace the AUDIO PWB.
The cable connector is inserted.
OK
NG
Replace the MAIN PWB.

2-11
2.11 USB doesn't function.
OK
End
Replace MAIN PWB
USB doesn't function.
NG
OK
Check connections of USB
PWB or MAIN PWB. The cable connector is inserted.
Replace the USB PWB.
NG
OK