Ericsson GF 768 Troubleshooting Manual page 15

4/00021-2/FEA 209 544/6 C
If the voltages at V608 are correct but the display is totally empty when phone is on, measure the voltages at the
display pads, H622 (fig. 3.4):
Pad # Name
1 2
I C-CLOCK
2 2
I C-DATA
3 VDIG
4 VDIG
5 GND
6 VLCD
Table 3.1
• If there isn't VLCD voltage at pad 6, measure the resistances from the pad to V608 pin 1 (~0 ohms) and from
pad 5 to GND (~0 ohms). If any of the resistances are too high there's a foil damage and the phone is to be dis-
Fig. 3.3
Fig. 3.4
Voltage
~3.2V
~3.2V
~3.2V
~3.2V
0V
~5.2V
Troubleshooting guide
15