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PF768, Standard Electrical Repairs
Assemble the phone with a new SIM card holder and try again.
If the fault remains, disassemble the phone again.
Measure the resistance of R704 (class A, ~100 kohms, fig. 6.4).
Make sure pins 64 and 72-75 (fig. 6.3) are correctly soldered.
Measure the resistances of R600 (~33 ohms), R627 (~0 ohms) and R628 (~100
ohms, allof class A and in fig. 6.4).
Check the resistances from the marked side of R600 to X600 pad 2, from the
marked side of R627 to X600 pad 3 and from the marked side of R628 to X600 pad
7 (all ~0 ohms and in fig. 6.3/6.4).
• If any of these resistances are too high there's a foil damage and the phone is to
be discarded.
• If the resistances are correct, replace D600 (class B, fig. 6.3).
If the fault remains, send the phone to the next level.
36
(68)
4/00021-2/FEA 209 544/11.C
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