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Nokia DCT4 Hardware Repair Technics


1110,1112,1600,2310,2610,6030 SOME TIMES POWER ON,SOME TIMES BLUE DISPLAY,SOME TIMES HANG NOKIA LOGO
THIS HANDSETS SOFTWARE CONNECTING TIME MANY DIFFERENT ERROR SHOW.

ERROR1)
MCU ID: 0x2201
FLASH ID0: 226800EC <=> SAMSUNG (SEC) -> K8S3215ETE Addr0: 0x01000000 - 0x01FFFFFF, SectorSize0: 10
FLASH ID1: 00010000 <=> Flash -> not used Addr1: 0x02000000 - 0x02FFFFFF, SectorSize1: 0
First 16 bytes: 25:06:2008 14:14 -> AD 7E B6 1A 1B BE 0B E2 7D 58 6B E4 DB EE 65 14 
Checking RAM for ALGO...
Algo is ready...
BOOTING NOT COMPLETED
ERROR2)
MCU ID: 0x2201
chk Failed! Aborting!
ERROR3)
Cable is not good -> check for 68k resistor b/w bsi-gnd in connector and 3.3k resistor in serial with bsi line
ERROR4)
SOME TIMES SHOW
UPP DAMAGED OR UEM DAMAGE ERROR SHOW!!!!!!!!!!!
AM EXPLAIN HOW TO SOLVED THIS PROBLEM 

1)FIRST CHECK EASY CABLE PORT
A)CLEAN OR CHANGE THIS CONNECTOR 
B)CHECK PCB CONTECT PICTUER NUMBER-1
2)CHECK BATTERY CONNECTOR
A)RESOLDRING BATTERY CONNECTOR OR CHNAGE IT PICTURE NUMBER-2
3)CHECK BSI LINE
A)CHECK PICTURE NUMBER-3
4)CHECK BSI RESISTER
A)FIRST REMOVE THIS RESISTER THEN CONNECT SOFTWARE 
B)SAME ERROR SHOW? CHANGE THIS RESISTER
5)CHECK SECOND LOCAL OSILLATOR 26Mhz CRYSTAL
A)CHNAGE THIS CRYSTAL

30%UEM PROBLEM
20%UPP PROBLEM 

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