GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 61 (112)
9.5 Green LED at the topindicator doesn’t work.
Open the phone and check for liquid damage.
The front side of the board is shown in fig. 9.1.
Make sure the double LED H650 (class A, fig. 9.1) is correctly soldered.
• If the solderings are correct, give the board power and start it up.
Measure the voltage at H600 pad 1 (~3.3V, fig. 9.2).
• If the voltage is missing at H600 pad 1, measure VRPAD (~3.8V) at V706 pad 2
(class A, fig. 9.2).
* If the voltage at V706 pad 2 is missing, check if VRPAD is at C453 (fig.
9.3).
* 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 the VRPAD voltage 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 still is too high after replacing R652 there’s probably
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 94.
If the problem isn’t solved, send the phone to the next level.
9.6 Red LED at the topindicator doesn’t work.
Open the phone and check for liquid damage.
The front side of the board is shown in fig. 9.1.
Make sure the double LED H650 (class A, fig. 9.1) is correctly soldered.
• If the solderings are correct, give the board power and start it up.
Measure the voltage at H600 pad 1 (~3.3V, fig. 9.2).
• If the voltage is missing at H600 pad 1, measure VRPAD (~3.8V) at V706 pad 2
(class A, fig. 9.2).
* If the voltage at V706 pad 2 is missing, check if VRPAD is at C453 (fig.
9.3).
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