T28 charging problem - GSM-Forum

tgsm · 09-05-2002, 12:44

I have T28 don`t power on. Change PA . Phone doest short anymore,but still dead. Resolder chips-still dead.
Change power IC -phone is alive found network,make calls but
dont charge: Charge only few seconds.
Change power IC again --- still the same.
Any solution please ?

Mikimiao · 09-05-2002, 15:48

Ok! normally no charging... one is the power ic other is the charging ic..... make sure every cap and resist is solder well and no lost around power ic and down around charging ic thatis v710 and v620.... take out power ic check the bga ball doing well and replace make sure the ic going well resolder back,,,, check v620 ok ,,v710 ok replace otherwise.. if still not ok take out service manual and check all the charging line if ok...normally is this three thing... good luck!

tgsm · 09-05-2002, 15:51

thank solved by myself.change 6 legs chip near flash

09-05-2002, 12:44	#1 (permalink)
tgsm Freak Poster Join Date: Jul 2002 Location: Europe Age: 47 Posts: 351 Member: 13827 Status: Offline Thanks Meter: 16	T28 charging problem I have T28 don`t power on. Change PA . Phone doest short anymore,but still dead. Resolder chips-still dead. Change power IC -phone is alive found network,make calls but dont charge: Charge only few seconds. Change power IC again --- still the same. Any solution please ?

09-05-2002, 15:51	#3 (permalink)
tgsm Freak Poster Join Date: Jul 2002 Location: Europe Age: 47 Posts: 351 Member: 13827 Status: Offline Thanks Meter: 16	thanks thank solved by myself.change 6 legs chip near flash

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09-05-2002, 15:48	#2 (permalink)
Mikimiao Major Poster Join Date: Aug 2002 Location: sg Age: 49 Posts: 42 Member: 14307 Status: Offline Thanks Meter: 3	Ok! normally no charging... one is the power ic other is the charging ic..... make sure every cap and resist is solder well and no lost around power ic and down around charging ic thatis v710 and v620.... take out power ic check the bga ball doing well and replace make sure the ic going well resolder back,,,, check v620 ok ,,v710 ok replace otherwise.. if still not ok take out service manual and check all the charging line if ok...normally is this three thing... good luck!