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PF768, Standard Electrical Repairs
* If all the voltages are correct, measure the VRTC voltage between the
positive side of C720 (class A, ~3.1V, fig. 3.8) and ground.
* If there's no VRTC voltage, replace V711 (class A, fig. 3.8).
* If there's VRTC voltage, measure the resistance from the positive
side of C720 (fig. 3.8) to the marked side of C692 (fig. 3.3, ~0 ohms).
* If the resistance is too high there's a foil damage and the phone is
to be discarded.
If the fault remains, send the phone to the next level.
3.4.5 Doesn't start in the flash programmer.
Open the phone and check for liquid damages.
Make sure the battery and system connector pads aren't dirty, liquid damaged or
oxidised.
Place the board in the fixture. Keep the board running by keeping DCIO high.
Check the VANA and VDIG voltages (~3.2V, fig. 3.4 and 3.3).
• If any of the voltages are too low, measure the resistance from it to ground
(VDIG>500 ohms, VANA>25 kohms).
* If the resistance is correct, replace the corresponding regulator(VDIG –
N702, VANA – N700, both of class A).
4/00021-2/FEA 209 544/11.C
Fig. 3.8
18
(68)
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