!!! NO ACCESS / NO NETWORK: 4 PA's CHANGED, 4 FAILURES !!! - GSM-Forum

dannyogolo · 05-09-2003, 16:25

Hello Ericsson Hardware Experts,

After many searches here, I realised that to repair NO ACCESS / NO NETWORK on Ericsson
(I have heard even also SonyEricsson) phones, the RF PA has to be changed. OK
I have done so on 4 Ericsson phones: T20, T28e, T29s, R320, but to my surprise, they
all still show the same "NO ACCESS or NO NETWORK" !!!

The PA I used was brought in from Dubai and they were Tagged T28 PA
Numbers on PA:
RM009-10P
E38666_1
0024
MEXICO
I am sure of my job, I solder them very neatly with Rework Station, this is since the
phones come on.
So now what seems to be the problem?

This is a challenge to us all !!!
Am I using a fake PA, or is it that PA is not the fault?

Every Ericsson Expert, lets face it.

Starting with you.

iki · 07-17-2004, 16:57

Did you changed the both or only the one of them.Sometimes both of them should be changed and the litle crystals by the RF,like on the T20 or T28

DMD · 07-17-2004, 18:56

@ dannyogolo

Its not always PA, PA, PA There is plenty of posts regarding the RF ic's being faulty as well

Regards D.

DeltaGSM · 07-17-2004, 19:32

In this case are 100% RF ic faulty.

Tested on T20, T28, T29, R310, R320, 2628, 1018.

WBR

Unggul · 07-20-2004, 23:12

yes i agree RF faults!!

ced1298 · 07-25-2004, 17:10

Quote:

Originally Posted by dannyogolo

Hello Ericsson Hardware Experts,

After many searches here, I realised that to repair NO ACCESS / NO NETWORK on Ericsson
(I have heard even also SonyEricsson) phones, the RF PA has to be changed. OK
I have done so on 4 Ericsson phones: T20, T28e, T29s, R320, but to my surprise, they
all still show the same "NO ACCESS or NO NETWORK" !!!

The PA I used was brought in from Dubai and they were Tagged T28 PA
Numbers on PA:
RM009-10P
E38666_1
0024
MEXICO
I am sure of my job, I solder them very neatly with Rework Station, this is since the
phones come on.
So now what seems to be the problem?

This is a challenge to us all !!!
Am I using a fake PA, or is it that PA is not the fault?

Every Ericsson Expert, lets face it.

Starting with you.

Sir, u just missed sumthing u must change also ur RF pre amps becoz when u change P.A. it will result into low sensitivity in ur RX dats why the phone can't see networks...Hope this helps u

spectrum · 07-26-2004, 11:16

There is a simple GO-N0 GO test for PAs
Either use a handheld Field meter or a small transceiver to check if your set is really transmitting.
But in your case, like has been pointed-out, it could be your rf ic, which is a stage before your PA

05-09-2003, 16:25	#1 (permalink)
dannyogolo No Life Poster Join Date: Nov 2002 Posts: 2,980 Member: 18200 Status: Offline Sonork: 100.1608286 Thanks Meter: 82	!!! NO ACCESS / NO NETWORK: 4 PA's CHANGED, 4 FAILURES !!! Hello Ericsson Hardware Experts, After many searches here, I realised that to repair NO ACCESS / NO NETWORK on Ericsson (I have heard even also SonyEricsson) phones, the RF PA has to be changed. OK I have done so on 4 Ericsson phones: T20, T28e, T29s, R320, but to my surprise, they all still show the same "NO ACCESS or NO NETWORK" !!! The PA I used was brought in from Dubai and they were Tagged T28 PA Numbers on PA: RM009-10P E38666_1 0024 MEXICO I am sure of my job, I solder them very neatly with Rework Station, this is since the phones come on. So now what seems to be the problem? This is a challenge to us all !!! Am I using a fake PA, or is it that PA is not the fault? Every Ericsson Expert, lets face it. Starting with you.

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07-17-2004, 16:57	#2 (permalink)
iki No Life Poster Join Date: Apr 2004 Location: Skopje , Macedonia Age: 40 Posts: 916 Member: 61851 Status: Offline Sonork: 100.1604862 Thanks Meter: 117	Did you changed the both or only the one of them.Sometimes both of them should be changed and the litle crystals by the RF,like on the T20 or T28

07-17-2004, 18:56	#3 (permalink)
DMD No Life Poster Join Date: Jun 2002 Location: CTSA Age: 46 Posts: 2,194 Member: 12660 Status: Offline Thanks Meter: 7	@ dannyogolo Its not always PA, PA, PA There is plenty of posts regarding the RF ic's being faulty as well Regards D.

07-17-2004, 19:32	#4 (permalink)
DeltaGSM No Life Poster Join Date: May 2004 Location: Bandung-Flasher.com Posts: 1,118 Member: 65947 Status: Offline Thanks Meter: 135	In this case are 100% RF ic faulty. Tested on T20, T28, T29, R310, R320, 2628, 1018. WBR

07-20-2004, 23:12	#5 (permalink)
Unggul No Life Poster Join Date: Jul 2004 Location: Bandung - West Java, Indonesia Age: 43 Posts: 501 Member: 71273 Status: Offline Thanks Meter: 14	yes i agree RF faults!!

07-26-2004, 11:16	#7 (permalink)
spectrum No Life Poster Join Date: Oct 2002 Posts: 1,126 Member: 17330 Status: Offline Thanks Meter: 15	There is a simple GO-N0 GO test for PAs Either use a handheld Field meter or a small transceiver to check if your set is really transmitting. But in your case, like has been pointed-out, it could be your rf ic, which is a stage before your PA