Nokia 6250 Service Bulletin 018
CONFIDENTIAL
1 (3)
Nokia Mobile Phones Service Bulletin No. SB-018/28.03.01
Technical Support, Europe & Africa
NHM-3
FLEX FOIL SOLDERING INSTRUCTIONS
LCD module (4850151) is connected to PWB with flexible printed cable (flex
foil). LCD module needs to be changed, if it is broken or i f uBGA components
need to be changed. The use of new LCD is recommended, if the old LCD
module had to be removed. Following tools and instructions are
recommended to be used and followed when changing flex foil by manual
soldering. Note that METCAL-station provides special technology and
constant temperature of the tip, which allows this soldering to the performed
accordingly.
Tested and recommended tools: Metcal Soldering Station
MX 500 (SmartHeat Technology)
http://www.metcal.com/products/1.2.1.htm
NHM-3 SB-018
Metcal Tip cartridge:
SMTC 162 (22.1 mm; max 412 °C)
Manufacturer:
http://www.metcal.com/
(belongs to OK International)
Working procedure
1. Desoldering a flex foil
Release of flex foil can be done by desoldering with the Metcal solder iron
with the same tip as it is used for soldering of the flex foil. The solder tip can
glide forwards between the flex and pads after approximately 3-5 seconds
without pressure. The use of solder iron is recommended instead of hot air.
CONFIDENTIAL
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2. Prepare the PWB and a new flex foil
- Clean the contacts on the PWB with the Metcal-Tip and put some flux on
the contacts
- Bend the flex foil a little bit at the perforation. Don't touch the contacts
with your fingers! Now it's easier to hold the flex foil in the right position
NHM-3 SB-018
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