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HP LT3200 Service Manual: Repair Tips; About Lead-free Solder

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Do not stack the circuit boards. Failure to observe this
precaution may result in problems resulting from
scratches on the parts, the deformation of parts, and
short-circuits due to residual electric charge.
Routing the wires and fixing them in position must be
done in accordance with the original routing and fixing
configuration when servicing is completed. All the wires
are routed far away from the areas that become hot (such
as the heat sink). These wires are fixed in position with
the wire clamps so that the wires do not move, thereby
ensuring that they are not damaged and their materials
do not deteriorate over long periods of time. Therefore,
route the cables and fix the cables to the original
position and states using the wire clamps.
Perform a safety check when servicing is completed.
Verify that the peripherals of the serviced points have
not undergone any deterioration during servicing. Also
verify that the screws, parts, and cables removed for
servicing purposes have all been returned to their proper
locations in accordance with the original setup.
A glass plate protects the LCD display. This glass plate
can be cleaned with a slightly moist cloth. If dirt appears
between the glass plate and the LCD display panel have
only a qualified service employee clean it.

Repair Tips

WARNING: All ICs and many other
semiconductors are susceptible to electrostatic
discharges (ESDs). Careless handling during repair
can be life-threatening. When repairing, make sure
that you are connected with the same potential as
the mass of the unit via a wrist wrap with
resistance. Keep components and tools also at the
same potential.

About Lead-Free Solder

LEAD IS LISTED AS (PB) IN THE PERIODIC
NOTE:
TABLE OF THE ELEMENTS. IN THE INFORMATION
THAT FOLLOWS, PB WILL REFER TO LEAD
SOLDER, AND PBF WILL REFER TO LEAD-FREE
SOLDER. THE LEAD-FREE SOLDER USED IN OUR
MANUFACTURING PROCESS AND DISCUSSED
HERE IS (SN+AG+CU). THAT IS TIN (SN), SILVER
(AG), AND COPPER (CU), ALTHOUGH OTHER
TYPES ARE AVAILABLE.
This model is manufactured using Pb-free solder for the
sake of environmental conservation. For service and repair
work, we suggest using Pb-free solder as well, although Pb
solder may be used.
PCBs manufactured using Pb-free solder have the sign
stamped on the PCB.
CAUTIONS:
Pb-free solder has a higher melting point than Pb solder.
Typically the melting point is 50–70ºF
(30–40°C) higher. Use a high temperature soldering
iron. Adjust your solder tool so that a temperature
around 360–380ºC is reached and stabilized at the solder
joint. Heating time of the solder joint should not exceed
4 seconds. Avoid temperatures above 400ºC; wear-out of
tips will rise drastically and flux-fluid will be destroyed.
Pb-free solder will tend to splash when heated too high
(about 1,100ºF or 600ºC).
Mix of Pb-free solder Tin (SN)/parts with leaded
soldering Tin (SN) in/parts is possible but not
recommended. If you have to use Pb solder, completely
remove all of the Pb-free solder on the pins or solder
area before applying Pb solder. If this is not practical, be
sure to heat the Pb-free solder until it melts, before
applying Pb solder.
After applying Pb-free solder to double-layered boards,
check the component side for excess solder that may
flow onto the opposite side (see the following
illustration).
HP High-Definition LCD TV Service Manual
3

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