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semiconductors in the unit, irrespective of the type
indication on these semiconductors.
2.4.2
Schematic Notes
•
All resistor values are in ohms and the value multiplier is
often used to indicate the decimal point location (e.g. 2K2
indicates 2.2 kohm).
•
Resistor values with no multiplier may be indicated with
either an "E" or an "R" (e.g. 220E or 220R indicates 220
ohm).
•
All capacitor values are given in micro-farads (µ= x10
nano-farads (n= x10
•
Capacitor values may also use the value multiplier as the
decimal point indication (e.g. 2p2 indicates 2.2 pF).
•
An "asterisk" (*) indicates component usage varies. Refer
to the diversity tables for the correct values.
•
The correct component values are listed in the Spare Parts
List. Therefore, always check this list when there is any
doubt.
2.4.3
Lead Free Solder
Philips CE is going to produce lead-free sets (PBF) from
1.1.2005 onwards.
P
Figure 2-2 Lead-free logo
This sign normally has a diameter of 6 mm, but if there is less
space on a board also 3 mm is possible.
Regardless of this logo (is not always present), one must treat
all sets from this date onwards according to the following rules.
Due to lead-free technology 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. In general, use of solder paste within
workshops should be avoided because paste is not easy to
store and to handle.
•
Use only adequate solder tools applicable for lead-free
soldering tin. The solder tool must be able
–
To reach at least a solder-tip temperature of 400°C.
–
To stabilise the adjusted temperature at the solder-tip.
–
To exchange solder-tips for different applications.
3. Directions for Use
You can also download this information from the following
websites:
http://www.philips.com/support
http://www.p4c.philips.com
-9
-12
), or pico-farads (p= x10
).
b
Directions for Use
•
Adjust your solder tool so that a temperature around 360°C
- 380°C is reached and stabilised at the solder joint.
Heating time of the solder-joint should not exceed ~ 4 sec.
Avoid temperatures above 400°C, otherwise wear-out of
tips will rise drastically and flux-fluid will be destroyed. To
avoid wear-out of tips, switch "off" unused equipment or
reduce heat.
•
Mix of lead-free soldering tin/parts with leaded soldering
tin/parts is possible but PHILIPS recommends strongly to
avoid mixed regimes. If not to avoid, clean carefully the
solder-joint from old tin and re-solder with new tin.
•
Use only original spare-parts listed in the Service-Manuals.
-6
),
Not listed standard material (commodities) has to be
purchased at external companies.
•
Special information for lead-free BGA ICs: these ICs will be
delivered in so-called "dry-packaging" to protect the IC
against moisture. This packaging may only be opened
short before it is used (soldered). Otherwise the body of the
IC gets "wet" inside and during the heating time the
structure of the IC will be destroyed due to high (steam-
)pressure inside the body. If the packaging was opened
before usage, the IC has to be heated up for some hours
(around 90°C) for drying (think of ESD-protection!).
Do not re-use BGAs at all!
•
For sets produced before 1.1.2005, containing leaded
soldering tin and components, all needed spare parts will
be available till the end of the service period. For the repair
of such sets nothing changes.
In case of doubt whether the board is lead-free or not (or with
mixed technologies), you can use the following method:
•
Always use the highest temperature to solder, when using
SAC305 (see also instructions below).
•
De-solder thoroughly (clean solder joints to avoid mix of
two alloys).
Caution: For BGA-ICs, you must use the correct temperature-
profile, which is coupled to the 12NC. For an overview of these
profiles, visit the website www.atyourservice.ce.philips.com
(needs subscription, but is not available for all regions)
You will find this and more technical information within the
"Magazine", chapter "Workshop information".
For additional questions please contact your local repair help
desk.
2.4.4
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 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.
L01.2E AB
3.
EN 5
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