Ericsson T18s Trouble-Shooting Instruction page 54

• If the voltage at H650 is incorrect, send the phone to Advanced electrical
repairs.
9.7 Red top indicator doesn't work.
Open the phone and check for liquid damages.
Make sure the double LED (H650, fig. 9.3) is correctly soldered.
Give the board power and start it up.
Measure the voltage at pin 4 of H650 (~3.2V).
• If the voltage is correct, replace H650 (class A).
* If that doesn't help, replace R647 (class A, fig. 9.3).
If the fault remains, check the soldering at pin 93 of D600.
• If the soldering is correct, measure the resistance from pin 93 of D600 to pin 3 of
H650 (~330 ohms).
* If it's correct, replace D600 (class B, fig. 9.2).
* If the resistance is incorrect there's a foil damage and the phone is to be dis-
carded.
• If the voltage at H650 is incorrect, send the phone to Advanced electrical
repairs.
9.8 The vibrator doesn't work.
Open the phone and check for liquid damages.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
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