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4 Replacement Procedures 4.31 LCD unit/Touch panel/Digitizer
4-88 [CONFIDENTIAL] PORTÉGÉ M780 Maintenance Manual (960-809)
The CMOS LSIs used in the digitizer sensor unit are very sensitive to ESD (Electro-Static
Discharge).
Person handling the digitizer sensor unit shall be grounded with wristband. Tools such as
a soldering iron, screwdriver and working benches shall be grounded.
Do not apply excessive mechanical forces to install the digitizer sensor unit; it will
damage the sensor board or electrical parts of digitizer sensor unit.
Refrain from strong mechanical shocks such as dropping to a working bench or hitting
against hard and heavy objects.
Do not pull, extend, warp, bend, twist and press the digitizer sensor unit even momentarily
when the digitizer sensor unit is installed in the enclosure of the system; it may damage
the digitizer sensor unit.
Keep the minimum of the curvature radius 120mm if you need to bend the digitizer sensor
unit. Be sure to install the digitizer sensor unit so that pushing/bending/twisting forces are
not applied to the digitizer sensor unit after the installation into the system.
When holding the digitizer sensor unit, do not even locally deform the sensor board; it
will leave a permanent dent or embossment which degrades the product quality.
When connecting or disconnecting to the digitizer sensor unit, do not slant the connector;
it may damage pins of the connector of the digitizer sensor unit.
Power supplies shall always be turned off during assembly process.
Do not connect or disconnect the connector with force applied to the digitizer sensor unit.
This may damage the digitizer sensor unit circuit.
To protect shielding metal from progressive aerugo and protect assembly worker’s fingers
from minor cuts, gloves must be worn when handling the digitizer sensor unit.
Do not let any bare conductive metal such as LCD metal bezel contact digitizer sensor
unit PCB directly. This may cause the digitizer sensor unit to malfunction.
Use extra caution to the part of connection between the controller and the sensor board so
that the connection pads will not be peeled off or damaged.
Do not pull the baby board or let it be caught by other object.
Do not store the digitizer sensor units in high temperature, especially in high humidity for
a long period of time (approximately more than one month).
It is recommended to store the digitizer sensor units where the temperature is in the range
of 15 to 35 degrees in Celsius and the relative humidity is lower than 70%.
Store the digitizer sensor units without exposing to direct sunlight or fluorescent lamps in
order to protect the digitizer sensor units from strong ultraviolet rays.
Avoid condensation of water on the digitizer sensor units otherwise it may cause mis-
operation or defects.
Keep the digitizer sensor units away from over-saturated humidity.
To transport or store the digitizer sensor units after initially opening the original carton
box, it is recommended to re-pack the digitizer sensor units into the original box by the
same method especially with desiccant in it.
Be careful to use the bezel guide.