T28 w/o network - GSM-Forum

Mike727 · 03-08-2002, 13:48

At first time this T28 was w/o sound in speaker. I rehot AD/DA IC. Speaker now work, but phone is loosing network. Who can help me?

Chuk · 03-08-2002, 22:01

Rehot it again (don't touch BGA with glue). Check RM009 soldering (may be damage after warming), try to change it.

Gizmotronics · 03-10-2002, 04:47

You can have to separate different faults.
Do not forget it.
1./Try to rehot antena switch. If it doesn’t affect reception go to 2
2./PA can cause reception problem.
Under the PA there is R + L filter check that L if it's gone you have to replace PA and that L
3./ Check the phone on all frequencies. If you get reception on single frequencies try to rehot Rx Tx filters.

If you need schematics e-mail me!

03-08-2002, 13:48	#1 (permalink)
Mike727 Junior Member Join Date: Jan 2002 Location: Russia Posts: 12 Member: 8909 Status: Offline Thanks Meter: 0	T28 w/o network At first time this T28 was w/o sound in speaker. I rehot AD/DA IC. Speaker now work, but phone is loosing network. Who can help me?

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03-08-2002, 22:01	#2 (permalink)
Chuk No Life Poster Join Date: Dec 2001 Location: Ukraine Age: 46 Posts: 1,146 Member: 7767 Status: Offline Thanks Meter: 3	Rehot it again (don't touch BGA with glue). Check RM009 soldering (may be damage after warming), try to change it.

03-10-2002, 04:47	#3 (permalink)
Gizmotronics Freak Poster Join Date: Feb 2002 Location: www.gsm-support.co.uk Age: 53 Posts: 189 Member: 9302 Status: Offline Thanks Meter: 1	You can have to separate different faults. Do not forget it. 1./Try to rehot antena switch. If it doesn’t affect reception go to 2 2./PA can cause reception problem. Under the PA there is R + L filter check that L if it's gone you have to replace PA and that L 3./ Check the phone on all frequencies. If you get reception on single frequencies try to rehot Rx Tx filters. If you need schematics e-mail me!