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Nokia Hardware & Hardware Repair all what you need for Hardware Repairing for Nokia Phones. Before writing any thread here try to check the Frequently Asked Questions Section. |
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09-18-2008, 10:29 | #32 (permalink) |
Freak Poster Join Date: Dec 2007 Location: india
Posts: 150
Member: 662585 Status: Offline Thanks Meter: 52 | 2600c keypad problem select exit up down bottens i have change key pad ic but same problem ? |
The Following User Says Thank You to rashad-a For This Useful Post: |
09-19-2008, 10:45 | #36 (permalink) |
No Life Poster Join Date: Sep 2002 Location: KERALA, india Age: 56
Posts: 1,237
Member: 15903 Status: Offline Sonork: 100.1583162 Thanks Meter: 1,046 | Is the set says no network found within a short time ? or only after a long duration search ? these two symptoms have to be treated in different ways with in short time it says no network found , we have to trace the beginning stages of receiving side kike antinna , contacts, antina switch and associated parts in RF block if the case is said as in the later one we had to suspect the demodulation section or decoding procedure, or any corruption in operating system may also result in network related errors so just do self test in either jaf or ufs u can understand situation better anyway try and stay tuned with this thread regards, NEIL |
The Following User Says Thank You to neilthirumuttam For This Useful Post: |
09-19-2008, 12:28 | #37 (permalink) |
Freak Poster Join Date: Feb 2008 Location: In heart Of ``HINDUSTAN`` Age: 37
Posts: 220
Member: 698819 Status: Offline Thanks Meter: 122 | Sir, ihv a N70 Rcvd White light ..( incoming Outgoing working ),,, then i applied low heat on Display crystal ic..& after that Set Is dead..So Sir plzz help me |
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09-19-2008, 13:15 | #38 (permalink) | |
Product Supporter Join Date: Sep 2006 Location: Kerala-India Age: 46
Posts: 6,600
Member: 351924 Status: Offline Thanks Meter: 12,469 | Quote:
right emi inside on/off ways pls insert charger this time phone light trun on sure that ic damaged u must change display EMI(2Nos) post result | |
The Following User Says Thank You to SHIJILFONOTLY For This Useful Post: |
09-24-2008, 07:54 | #43 (permalink) |
No Life Poster Join Date: Sep 2002 Location: KERALA, india Age: 56
Posts: 1,237
Member: 15903 Status: Offline Sonork: 100.1583162 Thanks Meter: 1,046 | Local mode problem & test mode problem, some general facts What is local mode? Local mode is triggered either by a service battery / jig from Nokia being used to power the phone, A faulty battery, a faulty phone or the phone has got "liquid ingress” also indicate local mode in display See this picture s in the above picture when BSI is grounded with a resistor of 5.1k to 7k1 and insert battery, nokia sets displays local/test mode on screen By this way we can trigger the set in to local mode and software operation through USB Local mode is triggered for reading & writing phone pm area (EEPROM), File system formatting etc. What is test mode? Test mode is for doing file system removing like full factory defaults Also can do pm area re-writing and for unlocking the phone Some phones displays either of these modes directly when battery is inserted to the phone and we gets in this condition for repairing This may be either by a faulty battery or damaged hardware in the handset. We can assume this is a BSI related fault TEST THE PHONE WITH A WORKING BATTERY Now what is BSI? BSI, the thermistor used to sense the battery temperature and shut down the charger Their is an internal circuit from power IC to BSI lead of battery this circuit manages charging mechanism and battery sensing. Faulty parts in this BSI circuit may lead to the local/test mode Or finally we have to suspect power ic Here NOKIA 1200 schematic is used to illustrate BSI way and possible reasons for this fault. he blue colored parts are related to the BSI function .we have to trace from battery connector, capacitors, and then other parts. These parts can be identified by reading the higher level schematic of the phone. By following this logic you may be able to trace local mode in any nokia phone with regards, NEIL nokia repair master team |
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