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4. Service points
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Lead-free solder
This product uses lead-free solder (unleaded) to help protect the environment. Please read these instructions
before attempting any soldering work.
Caution: Always wear safety glasses to prevent fumes or molten solder from getting into
the eyes. Lead-free solder can splatter at high temperatures (600℃).
„ Lead-free solder indicator
Printed circuit boards using lead-free solder are engraved with an "F."
„ Properties of lead-free solder
The melting point of lead-free solder is 40-50℃ higher than leaded solder.
„ Servicing solder
Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended. Although servicing with
leaded solder is possible, there are a few precautions that have to be taken. (Not taking these precautions
may cause the solder to not harden properly, and lead to consequent malfunctions.)
Precautions when using leaded solder
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Remove all lead-free solder from soldered joints when replacing components.
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If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the
lead-free solder has been completely melted (do not apply the soldering iron without solder).
„ Servicing soldering iron
A soldering iron with a temperature setting capability (temperature control function) is recommended.
The melting point of lead-free solder is higher than leaded solder. Use a soldering iron that maintains a high
stable temperature (large heat capacity), and that allows temperature adjustment according to the part being
serviced, to avoid poor servicing performance.
Recommended soldering iron:
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Soldering iron with temperature control function (temperature range: 320-450℃)
Recommended temperature range per part:
Part
Soldering iron temperature
Mounting (chips) on mounted PCB
320℃±30℃
Mounting (chips) on empty PCB
380℃±30℃
Chassis, metallic shield, etc.
420℃±30℃
The PWB assembly which has used lead free solder
(1) POWER/EMI PWB, AUDIO POWER PWB, RS-232 PWB, AUDIO PWB, KEY PAD PWB, IR PWB, I/O PWB,
CONNECTOR PWB, SPEAKER CONNECTOR PWB, HDMI PWB
(2) MAIN PWB
(3) ATSC BOX(Digital Tuner Module) / TUNER
(4) POWER MODULE
(5) PDP MODULE (is all lead free solder. X-SUS PWB, Y-SUS PWB, LOGIC PWB, ADDRESS PWB, SDM PWB)
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