A1018s/A1018sc Standard Electrical Repair
4/00021-2/FEA 209 544/16.B 27 (42)
Give the board power and start it.
Measure VVIC at D901:1 (3.2 V, Fig. 7.1).
• If the voltage is missing:
* Replace C910 and R920 (class A).
• If the voltage exists:
* Measure the voltage at D901:2 (3.2 V).
* If the voltage exists:
1. Measure the resistance between D901:8 and J603:2 (~33 Ohm).
Incorrect: 1. Replace R600 (class A).
2. Foil damage, the board has to be discarded.
2. Measure the resistance between D901:11 and J603:7 (~33 Ohm).
Incorrect: 1. Replace R628 (class A).
2. Foil damage, the board has to be discarded.
3. Measure the resistance between D901:9 and J603:3 (~ 33 Ohm).
Incorrect: 1. Replace R627 (class A).
2. Foil damage, the board has to be discarded.
4. Measure the resistance between D901:11 and D901:14 (~ 15 kOhm).
Incorrect: 1. Replace R626 (class A).
2. Foil damage, the board has to be discarded.
5. Measure the resistance of C909 (> 1 MOhm).
Incorrect: 1. Replace C909 (class A).
6. Measure the resistance between D901:14 and ground (> 1 MOhm).
Incorrect: 1. Replace C908 (class A).
7. Measure the resistance between D901:14 and J603:1 (~ 0 Ohm).
Incorrect: Foil damage, the board has to be discarded.
8. Replace D901 (class A).
9. Replace R634 (class A).
10. Replace D600 (class B).
* If the voltage is missing at D901:2 (3.2 V):
* Measure the resistance between D901:2 and D600:77 (~0 Ohm)
Correct: Replace D600 (class B).
Incorrect: Foil damage, the board has to be discarded.
If the fault still remains, send the phone to the next repair level.
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