GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 47 (112)
Make sure that the SIM-card holder is properly soldered.
Make sure the SIM-card holder pads aren’t loose (if they are, then the phone should
be discarded due to foil damage) and that the board leads are intact.
Measure the resistance of R704 (class A, ~100 kohms, fig. 7.5).
Check the solderings at D600 pins 64, 72, 73, 74 and 75 (fig. 7.6).
Measure the resistance of R600 (class A, ~33 ohms), R627 (class A, ~0 ohms) and
R628 (class A, ~33 ohms, fig. 7.4). The resistor R627 is placed according to fig. 7.7
at revision R3A and above.
Check the resistances from R600 to J603 pin 2 (~0 ohms) and from R628 to J603
pin 7 (~0 ohms).
• If any of them are too high there is a foil damage and the phone should be dis-
carded.
Replace V700 (class A) and V609 (class A, fig. 7.5).
If the problem isn’t solved, send the phone to the next level.
To Next Page
Loading...
