Phone Does Not Switch On - Nokia 2100 Repair Hint

Customer Care Europe, Middle East & Africa
Technical Services / SCCE Training Group
© 2004 Nokia Corporation
Chapter 2: Phone does not switch on
Pre-check
Check mechanical appearance of battery connector (X101); especially check spring-contacts if bent,
soiled or corroded; change connector if necessary.
Check contact-pads of battery connector on PWB for dirt. If necessary clean the PWB with an
appropriate amount of alcohol. Do not use any scratching or rubbing tools!!!
First you should try is to perform a software update.
Repair instructions
Check voltage at S330, 4VDC when power switch is not pressed.
If voltage is not ok, check resistance and soldering of R118; otherwise CCONT (N100) is defective.
Swap the phone, because CCONT is underfilled and therefore not changeable.
If voltage at S330 is ok, it must decrease to 0V while pressing the power switch;
otherwise change S330.
Check sleepclock 32.768kHz square wave at J228.
If signal is not measurable, check if voltage at pads of B100 is 1.4VDC. If voltage is not ok, check
resistance of R100/102/154; otherwise CCONT N100 is probably faulty.
Swap the phone because CCONT is underfilled and therefore not changeable.
32.768kHz sleepclock at J228
Check VXO 2.7 VDC at C831 and VCON (varies between 0.3 VDC and 2.3VDC, normally 1.2VDC) at C832.
If these two voltages are ok, you must be able to measure 26MHz Clk-frequency at C830. Even
without control-voltage the oscillator must work on a frequency around 26MHz – if not, you have
to change G830.
© NMP 2004
CONFIDENTIAL
NAM-2
03/03/2004
Checked by:
SCCE
8 (15)
Repair Hints
Version 2.0 Approved
Approved by:
SCCE Training Group