Ericsson T18s Trouble-Shooting Instruction page 38

• If it is too high, it is either R453 or R648 (both class A and in fig. 6.1) that is
faulty. Measure their resistance and replace the resistor that is faulty.
Measure the resistance between J602 pin 1 (DCIO) and X800 pin 3 (VBATT).
• If it is lower then 10 kOhm is V450 (class A) faulty and has to be replaced.
If the fault still remains, send the phone to Advanced electrical repairs.
6.4 Starts, but doesn´t begin to charge, even
though it shows charging.
Open the phone and check for liquid damages, especially at the system connector. If
the gold plating are damaged, the board has to be discarded.
Measure the resistance of R453 (~0.1 Ohm, fig. 6.1).
* If it is incorrect, replace R453 (class A).
Measure the resistance of R648 (~0 Ohm, fig. 6.1).
* If it is incorrect, replace R648 (class A).
Measure the resistance between DCIO and V450:6 (~0 Ohm, Fig. 6.1).
* If it is incorrect, is there a foil damage and the board has to be discarded.
Measure the resistance between GND (pin 10) and AGND (pin 4, Fig. 6.1) at the
system connector (~0 Ohm).
* If it is incorrect, is there a foil damage and the board has to be discarded.
If the fault still remains, send the phone to Advanced electrical repairs.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
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