freezing 8250 - GSM-Forum

eureka8888 · 08-05-2002, 21:12

8250 hanging after contact service usually hangs and it is caused by unsoldered cpu. u can verify this by putting a data cable with screws that will press the cpu down, the phone won't freeze then. my problem is how to resolder this cpu, is it really underfilled? can i heat it on the other side for it to resolder?
thanks

willy · 08-05-2002, 21:21

Eurek8888,

Good ,,

it is real problem reason 8250 hung , because pad for CPU become rusty !

if you remove CPU, and clean epoxy , then you can see it rusty at
L1, M1, N1 pin, or N7 N8 N9,,,,,,

no others way. only remove CPU, and clean rusty , then put new CPU , that's it

Quote:

Originally posted by eureka8888
8250 hanging after contact service usually hangs and it is caused by unsoldered cpu. u can verify this by putting a data cable with screws that will press the cpu down, the phone won't freeze then. my problem is how to resolder this cpu, is it really underfilled? can i heat it on the other side for it to resolder?
thanks

j2000 · 08-06-2002, 16:23

Willy is right usually CPU or Flash is not good connected to pcb.
Sometime we can solve this Hang 82 series with ADD some Hard Foam between CPU or Flash IC and Housing...
Let the Housing or CPU push the FOAM...if not hang again....hurry up sell it to someone hehehehe...
Coz usually its only can use 1 or few week...after that it will Hang Again....
This Solution is just for CPU or Flash with GLUE...if without glue...just Change it...

highhighs · 07-31-2003, 21:26

isnt there a way to fix the cpu with gleu , its just doomed to hang ?

08-05-2002, 21:12	#1 (permalink)
eureka8888 No Life Poster Join Date: May 2001 Posts: 569 Member: 4675 Status: Offline Thanks Meter: 7	freezing 8250 8250 hanging after contact service usually hangs and it is caused by unsoldered cpu. u can verify this by putting a data cable with screws that will press the cpu down, the phone won't freeze then. my problem is how to resolder this cpu, is it really underfilled? can i heat it on the other side for it to resolder? thanks

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08-06-2002, 16:23	#3 (permalink)
j2000 No Life Poster Join Date: Sep 2001 Location: Country of "TIHS" Posts: 888 Member: 6349 Status: Offline Thanks Meter: 6	Willy is right usually CPU or Flash is not good connected to pcb. Sometime we can solve this Hang 82 series with ADD some Hard Foam between CPU or Flash IC and Housing... Let the Housing or CPU push the FOAM...if not hang again....hurry up sell it to someone hehehehe... Coz usually its only can use 1 or few week...after that it will Hang Again.... This Solution is just for CPU or Flash with GLUE...if without glue...just Change it...

07-31-2003, 21:26	#4 (permalink)
highhighs Junior Member Join Date: Jul 2003 Posts: 2 Member: 36122 Status: Offline Thanks Meter: 0	isnt there a way to fix the cpu with gleu , its just doomed to hang ?