Author Topic: Offline Solution Via Lay-out Troubleshooting  (Read 1588 times)

upp22edz

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Offline Solution Via Lay-out Troubleshooting
« on: February 12, 2008, 07:12:57 PM »
Share ko ang research at experience ko dito sa offline ng mga BB5 handset.

Meron akong tanggap 6680 offline (insert sim), tumagal ng 3hrs ang paggawa ko at eto ang mga procedures.

History: Malinis ang unit, offline (insert sim) lang ang sira.
Action taken part1:
1- Check simcard --- offline pa rin
2- Reheat sim crystal ic (sim reader) --- offline pa rin
3- Replace sim reader --- offline pa rin
4- Remove sim reader and applied jumper --- offline pa rin
5- Change RETU --- offline pa rin

Action taken part2:
1- Kumuha ako ng 6680 testboard
2- Check ko lay-out
3- CONFIRMED, open ang lay-out ng isang paa ng sim interface ng unit.

ETO ang PICS ng Action Taken part2

PIC1:


PIC2:


As you can see in the pictures that I made, I have traced the circuitry of sim interface to the sim reader and placed a jumper wire. I used speaker wire of 3310 (earpiece), then ibinalik ko ung crystal ic.

PROBLEM SOLVED!


Note: kapag lahat ginawa mo na at offline pa rin, try to check the lay-out. sundan mo na lang ang ginawa ko... :D

Srimeenakshimobiles

Offline Solution Via Lay-out Troubleshooting
« on: February 12, 2008, 07:12:57 PM »

 

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