Ericsson PF 768 Troubleshooting Instructions page 41

PF768, Standard Electrical Repairs
ohms). The foil damage is most usually caused by liquid damages. If
there, for instance, is voltage at the 4 and 5 keypads but not at the 6 and
"volume up" keypads there's a foil damage somewhere between key-
pads 5 and 6 and the phone is to be discarded.
If a column or part of it isn't functional, check the solderings at D600 pins 1 and
120-128.
• If all the solderings are correct, replace D600 (class B).
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