C902 poor network issue - GSM-Forum

gerdzio · 04-18-2010, 18:12

Hello
I have SE c902 with very poor network. Phone loses network and goes to emergency calls only.
I've just reflashed the phone but nothing has changed.
Any suggestions welcome.

THX

Hells_Angel443 · 04-18-2010, 19:04

Dear Sir.
I don't have C902 schematics in hand, so I can't show visually where the desired components are but...
If you have schematics ,try to change x1200 (RF connector) and the two (check that there are two of them cause they have a tendency to fall off) RF pins (antenna connectors) that placed on the other side of the board behind the micro-phone. It's usually works. (If you have schematics of C902 place them on-line and I'll point the desired components).

If you don't have new components to replace the old ones, then reheat the X1200 (RF connector) and with thin tweezers bend the antenna connectors with the point's up (to ensure that there will be a touch between them and the antenna).

If that didn't helped and you are in desperate condition, reheat the RF modules (Do not use over 260C!!!)

And don't use Tucky Flux on RF!

Good Luck and Godspeed!
Pavel A.

gerdzio · 04-18-2010, 19:19

Problem solved.
One pad on the motherboard was missing and I had to solder it.

04-18-2010, 18:12	#1 (permalink)
gerdzio No Life Poster Join Date: Mar 2008 Location: Irvinestown Posts: 839 Member: 719399 Status: Offline Thanks Meter: 228	C902 poor network issue Hello I have SE c902 with very poor network. Phone loses network and goes to emergency calls only. I've just reflashed the phone but nothing has changed. Any suggestions welcome. THX

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04-18-2010, 19:04	#2 (permalink)
Hells_Angel443 Major Poster Join Date: Nov 2008 Posts: 46 Member: 905846 Status: Offline Thanks Meter: 26	Dear Sir. I don't have C902 schematics in hand, so I can't show visually where the desired components are but... If you have schematics ,try to change x1200 (RF connector) and the two (check that there are two of them cause they have a tendency to fall off) RF pins (antenna connectors) that placed on the other side of the board behind the micro-phone. It's usually works. (If you have schematics of C902 place them on-line and I'll point the desired components). If you don't have new components to replace the old ones, then reheat the X1200 (RF connector) and with thin tweezers bend the antenna connectors with the point's up (to ensure that there will be a touch between them and the antenna). If that didn't helped and you are in desperate condition, reheat the RF modules (Do not use over 260C!!!) And don't use Tucky Flux on RF! Good Luck and Godspeed! Pavel A.

04-18-2010, 19:19	#3 (permalink)
gerdzio No Life Poster Join Date: Mar 2008 Location: Irvinestown Posts: 839 Member: 719399 Status: Offline Thanks Meter: 228	Problem solved. One pad on the motherboard was missing and I had to solder it.