No Serv Or Can´t Place A Call - Ericsson GH 688 Trouble-Shooting Instruction

GH688,GA628, Standard Electrical Repairs
2 No serv or can´t place a call.
2.1 Find out if the problem is Tx- or Rx-related.
Connect the phone (with signaling program) to a GSM instrument and try to get
serv at –68.5dBm signal strength.
• If the phone gets serv proceed to section 2.2.
• If it doesn't get serv it's probably a problem located in the LO-part or the losses
in the signal path are too great.
Open the phone and check for liquid damage.
The component side of the board is shown in fig. 2.1.
Fig. 2.1
Check the antenna connector, X401 (class A, fig. 2.2), and make sure that it isn't
damaged or dirty (glue, varnish, oxide...) and that the solderings aren't faulty.
Fig. 2.2
Look for faulty solderings at G350 and C359 (fig. 2.3).
8
(112)
4/00021-2/FEA 209 544/1.G