GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 62 (112)
* If VRPAD is incorrect or missing, proceed to chapter 3 (“Doesn´t start”-
fault).
* If the voltage at C453 is correct, check the resistance from C453 and
V706 pad 2 (~0 ohms).
* If the resistance is too high there is a foil damage and the phone
should be discarded.
* If VRPAD at V706 pad 2 is correct, measure the resistance from VBATT to
V706 pad 3 (~4.7 ohms, fig. 9.2).
* If the resistance is too high, replace R652 (class A, fig. 9.2).
* If the resistance is still too high after replacing R652 there is proba-
bly a foil damage somewhere between VBATT and marked side of
R652 and the phone should be discarded.
* If the resistance from VBATT to V706 pad 3 is correct, replace V706
(class A).
Check the soldering at D600 pad 93.
If the problem isn’t solved, send the phone to the next level.
9.7 Both LEDs at the top indicator glows faintly
and the buzzer sounds faintly.
Open the phone and check for liquid damage.
Give the board power and start it up.
Measure VRPAD (~3.8V) at v706 pin 2 (class A, fig. 9.2).
• If VRPAD is correct, replace V706 (class A).
* If that doesn’t help replace R652 (class A).
• If the voltage at V706 pin 2 is missing, check if there is voltage at C453 (~3.8V,
fig. 9.3).
* If it’s incorrect or missing, proceed to chapter 3 (“Doesn´t start”-fault).
* If the voltage at C453 is correct, check the resistance from C453 to V706
pad 2 (~0 ohms).
*If the resistance is too high there is a foil damage and the phone should
be discarded.
If the problem isn’t solved, send the phone to the next level.
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