NEC NL3224BC35-20 Operating and safety instructions

Document Number: DOD-PD-1261 (2nd edition)
Published data: December 2005 CP (N)
1
©NEC LCD Technologies, Ltd.
2005 All rights reserved.
TFT COLOR LCD MODULE
NL3224BC35-20/22
LAMP HOLDER SET REPLACEMENT MANUAL
(2nd edition)
This manual applies replacement of lamp holder set.
Contents
1. PRECAUTIONS.....................................................2
1.1 MEANING OF CAUTION SIGNS .................2
1.2 CAUTIONS......................................................2
1.3 ATTENTIONS.................................................3
2. REPLACEMENT PROCEDURE ..........................4
2.1 PREPARATION ..............................................4
2.2 REGARDING THE LAMP HOLDER SET ....4
2.3 REPLACEMENT.............................................5
3. DISPOSAL OF THE LAMP HOLDER.................5
Precautions to be observed by the customers
NEC LCD Technologies, Ltd.(hereinafter called “NEC”) recommends that the customer returns the LCD
module through the original purchase path to NEC, when replacement of the lamp holder is required.
Customer should consider the followings before replacing the lamp holder.
(1) This work can cause a lowering of the quality (performance). Even if the replacement work is performed
in accordance with this manual, NEC is unable to guarantee the lowering of the quality, which is caused
by customer's replacement work.
(2) Replacement of the lamp holder involves the handling of high voltage circuits. If replacement was done
incorrectly, the LCD module could present a shock, fire or other hazard, both during and after the
replacement work.
Customer's replacing the lamp holder do so at their own risk. NEC will not assume any liability for the LCD
module, and will not warrant any LCD module, which have been modified by the customer, including
replacement of the lamp holder, even when the attached procedure is used. If it is necessary to return the
LCD module to NEC after an attempted repair, NEC will charge the cost of the repairs to the customer.

DOD-PD-1261 (2nd edition) 2
1. PRECAUTIONS
1.1 MEANING OF CAUTION SIGNS
The following caution signs have very important meaning. Be sure to read ‘1.2 CAUTIONS’ and
‘1.3 ATTENTIONS’, after understanding these contents!
!CAUTION
This sign has the meaning that customer will be injured by
himself, or the product will sustain damage, if customer has
wrong operations.
This sign has the meaning that customer will get an electrical shock, if customer has
wrong operations.
This sign has the meaning that customer will be injured by himself, if customer has
wrong operations.
1.2 CAUTIONS
(1) Do not touch HIGH VOLTAGE PART of the backlight inverter while turn on. There is a danger of
an electric shock. So that, be sure to check again before starting replacement work that the power is
turned OFF.
(2) Be sure to wait some time after turning power OFF before starting replacement work. There is a
danger of an electric shock because the inverter is charged at a high voltage after working.
(3) Be sure to wait some time after turning power OFF before starting replacement work. There is a
danger of burn injury, because the lamp holder and high voltage section of the inverter are hot after
working.
(4) Take care not to injure yourself while treating the metal frame of the lamp holder.
(5) Do not shock and press the LCD panel and the lamp holder. There is a danger of breaking, because
they are made of glass.
(6) The fluorescent lamp in the LCD module may be damaged in some cases. Take care not to injure
yourself while treating the lamp. If the lamp is damaged inside, quality problems may occur, such
as un-even brightness by pieces of broken glass left inside. In this case return it to NEC for repair.
!

DOD-PD-1261 (2nd edition) 3
1.3 ATTENTIONS
(1) Do not press or rub on the sensitive display surface. If customers clean on the panel surface, NEC
recommends using the cloth with ethanolic liquid such as screen cleaner for LCD.
(2) When handling the LCD module, take the measures of electrostatic discharge with such as earth
band, ionic shower and so on, because the LCD module may be damaged by electrostatic.
(3) Do not touch with bare hand or dirt the cold cathode fluorescent lamp in the lamp holder. If do so,
display mura might occur.
(4) Do not bend or unbend the lamp cable at the near part of the lamp holding rubber, to avoid the
damage for high voltage side of the lamp.
(5) Properly connect the adaptable plug (backlight side) to socket (inverter side) without incomplete
connection. After connecting, be careful not to hook the lamp cables because incomplete connection
may occur by hooking the lamp cables. This incomplete connection may cause abnormal operation
of high voltage circuit.
(6) Do not hook nor pull cables such as lamp cable, and so on, in order to avoid any damage.
(7) Do not shock and press the LCD panel and the backlight. There is a danger of breaking, because
they are made of glass.
(8) If dirt or dust gets on the cold cathode fluorescent lamp, display mura might occur. Therefore, NEC
recommends using a clean room or clean bench (the class "D" level).
!
Lamp cable High voltage side of the lamp
Holding rubber

DOD-PD-1261 (2nd edition) 4
2. REPLACEMENT PROCEDURE
2.1 PREPARATION
The following facilities and tools are required.
(1) Finger stalls (glove)
(2) Grounding band (earth band)
(3) Workbench which is covered with conductive mat (workbench equipped to be prevent static
charges can be used)
(4) Radio pliers, tweezers
(5) Replacing parts
LCD Module Lamp holder set
NL3224BC35-20/22 55LHS11
2.2 REGARDING THE LAMP HOLDER SET
(1) One set consists of two holders.

DOD-PD-1261 (2nd edition) 5
2.3 REPLACEMENT
Refer to the Fig.1 and Fig.2.
(1) Put on the fingerstalls and attach the grounding band.
(2) Turn the ionizer switch on.
(3) The LCD module should be kept turned off, and wait for a while until the backlight get cool down
enough.
(4) Put the LCD module display side up on the flat workbench, which is equipped for static charge
prevention.
(5) Pull out the lamp cable plug from lamp connector in Figure. Do not fold the high voltage cable as
sharp folds can cause permanent damage.
(6) Release the lamp holder from clamped portion Ain figure 2 pushing up portion A.
(7) Slowly, gently and in a straight line pull out the lamp holder in the direction of the arrow Bin
figure 2. If the lamp was broken inside of backlight lamp, carefully pull out the lamp holder. If
pieces of glass remain inside the enclosure, carefully remove them.
(8) Slowly, gently and in a straight line push in the lamp holder in the direction of the arrow Cand
lock portion Ain figure 2.
(9) Replace the lamp holder. The up side lamp holder is the same as down side.
(10) Fix the lamp holder through the clamp position A in figure 2.
(11) Replace the lamp holder is possible to set in the upper side lamp and the lower side.
3. DISPOSAL OF THE LAMP HOLDER
The lamp holder includes cold cathode fluorescent lamps. Follow local ordinances or regulations for its
disposal. Do not reuse the replaced lamp holder set.

DOD-PD-1261 (2nd edition) 6
B
C
Lamp Holder
A
Fig.2 Around the Lamp Holder
Lamp Connector
Fig.1 LCD module
Lamp Connector
Lamp Cable
Lamp Cable
Holder insert area Holder insert area
LCD module