Ericsson GH 688 Trouble-Shooting Instruction page 32

GH688,GA628, Standard Electrical Repairs
Applies for KRC 114 279 (Seiko display):
All of the values approximately 0.2V .
If one or more of the voltages are incorrect, measure the resistance if C633 (class A,
>100 kohms, fig. 5.5) and C824 (class A, >25 kohms, fig. 5.2 and 5.3).
• If any of the resistances are too low, replace the corresponding capacitor.
• If both the resistances are correct, replace both diodes.
* If any of the voltages at the diodes still are wrong after replacing them,
check the solderings at D600 pads 95 and 96.
* If they are correct, replace C634 and C632 (class A, fig. 5.2 and 5.3)
Applies for KRC 114 245 and KRC 114 277 (Philips display):
• Make sure that there VLCD (~-3.7V) voltage at H622 pad 5 (fig. 5.5).
* If there is no, check the resistances from H622 pad 5 to V611 pin 2 (~0
ohms) and from H622 pad 3 to ground (~0 ohms).
* If any of the resistances are too high there is a foil damage and the phone
is to be discarded.
4/00021-2/FEA 209 544/1.G
Fig. 5.3
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