GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 58 (112)
* 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).
Measure the resistance from H600 pad 2 to V606 pad 3 (10 ohms, fig. 9.2).
• If the resistance is too high replace R653 (class A, fig. 9.2).
• If the resistance is correct, check the soldering at D600 pad 91 (fig. 9.3).
* If the soldering is correct, replace R651 (class A, fig. 9.3) and V606 (class
A, fig. 9.2).
* If that doesn’t help, replace D600 (class B, fig. 9.3).
If the problem isn’t solved, send the phone to the next level.
9.3 The illumination of the display is missing or
faintly glowing.
Open the phone and check for liquid damage, especially at the marked area in fig.
9.4.
Make sure all the LEDs (H651, H652, H653 and H654, all class A, fig. 9.1) are
properly mounted and soldered.
Fig. 9.4
Give the board power and start it up. If a few, but not all of the LEDs aren’t lit,
replace them.
• If none of the LEDs are lit, measure the resistance of one of them.
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