
Safety Instructions, Warnings, and Notes
EN 5
LC4.1U AA
2.
Note:
Do not apply solder paste, as this has shown to result in
problems during re-soldering.
Device Replacement
The last step in the repair process is to solder the new
component on the board. Ideally, the (LF)BGA should be
aligned under a microscope or magnifying glass. If this is not
possible, try to align the (LF)BGA with any board markers.
To reflow the solder, apply a temperature profile according to
the
IC data sheet
. So as not to damage neighbouring
components, it may be necessary to reduce some
temperatures and times.
More Information
For more information on how to handle BGA devices, visit this
URL:
www.atyourservice.ce.philips.com
(needs subscription,
not available for all regions) ). After login, select “Magazine”,
then go to “Workshop Information”. Here you will find
Information on how to deal with BGA-ICs.
2.3.4
Lead Free Solder
Some PWBs in this chassis are “lead-free
prepared
”. This is
indicated on the PWB by the PHILIPS lead-free logo (either by
a service-printing or by a sticker). It does not mean that lead-
free solder is actually used!
Figure 2-2 Lead-free logo
Due to this fact, some rules have to be respected by the
workshop during a repair:
•
Use only lead-free soldering tin Philips SAC305 with order
code 0622 149 00106. If lead-free solder paste is required,
please contact the manufacturer of your soldering
equipment.
•
Use only adequate solder tools applicable for lead-free
soldering tin.
•
Adjust your solder tool so that a temperature around 217 -
220 deg. C is reached at the solder joint.
•
Do not mix lead-free soldering tin with leaded soldering tin;
this will lead to unreliable solder joints!
•
Use only original spare parts listed in this manual. These
are lead-free parts!
•
On the website
www.atyourservice.ce.philips.com
(needs
subscription, not available for all regions) you can find
more information on:
–
Aspects of lead-free technology.
–
BGA (de-)soldering, heating-profiles of BGAs used in
Philips sets, and others.
2.3.5
Practical Service Precautions
•
It makes sense to avoid exposure to electrical shock.
While some sources are expected to have a possible
dangerous impact, others of quite high potential are of
limited current and are sometimes held in less regard.
•
Always respect voltages
. While some may not be
dangerous in themselves, they can cause unexpected
reactions - reactions that are best avoided. Before reaching
into a powered TV set, it is best to test the high voltage
insulation. It is easy to do, and is a good service precaution.
P
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