Ericsson T18s Trouble-Shooting Instruction page 53

* If the soldering is correct, replace D600 (class B, fig. 9.2).
• If the voltage is incorrect there's a foil damage and the phone is to be discarded.
NOTE! Since the LEDs only are lit for ~10s you need to press a key before
measuring.
9.6 Green 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 R646 (class A, fig. 9.3).
If the fault remains, check the soldering at pin 94 of D600.
• If the soldering is correct, measure the resistance from pin 94 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.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
Fig. 9.3
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