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Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 10-01-2002, 11:32   #1 (permalink)
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Thumbs up PPROBLEM ON ERICSSON T2xx NETWORK PRESENT BUT IMPOSSIBLE TO CALL.


This problem is occurred when we try to make a call, the phone appears bars of signal, but as soon as it tries to hook the bridge the bars they disappear. In 99% of the cases, this fault is caused by the N234 look number 9 in figure:
http://www.inside-gsm.com/Ericsson/T...ption_t28.html

in some cases the problem is also occurred with an overheating of the zone, as it often happens also for when the PA (in first serie RM009-15P in new serie RM009-19P) is broken, this points out that the component is in short. Before replacing the component it is advisable to check if the connector of the antenna is well soldered and good (if there are connections inside to the connector, you can use the oscilloscope or a normal tester whit function of continuity) and also if all components on RF zone (around PA, and around N234 are OK). When you replace this component set attention that all the footsies are well soldered on the logic, and if the problem is the same now you can change only Pa and Antenna switch number 15 and 12 on figure.
Remember also to avoid the damage of the Dome switch and Dome led it is necessary to remove it from the logic with a simple hair dryer.

hoping for to be you of help,
BSTRGS




Last edited by Pandemonio100; 10-01-2002 at 11:38.
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