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The reason for Nokia models 210 & 212 have difficulties with
older Senda cards and not authorized cards have it source in
a IC called TDA4008T. This circuit is the feeder of the 5 Volt's
which goes to the smartcardslot and the smartcard.
This circuit can only supply the card with maximum 0.065 Amp's
and can also be programmed from the SW to a specific sourcelimit.
To overcome this, it's possible do a smal modification to outmanover
the circuits significance.
Solution:
Lift pin 17 on the TDA4008T and then connect a 1kohm resistor from
the lifted leg to pin 19 on same IC. On the spot which pin 17 was
soldered, connect 5 Volts via a 100 ohm resistor, choose any place
on the PCB where you find 5 Volts or from the main powersupply.
Testade hemma, och de funkar!
Det hela innebär lite lödning och ett par komponenter.
Varning! Är du inte van vid att löda så be gärna någon som är att göra de
Hälsn Stimo
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