G3 motherboard problems - GSM-Forum

Igoritza · 02-21-2017, 14:30

Hello all

I recently got a shipment of 15 units of G3 from a german company which released them for recycling

In the meantime I realized that this phone has serious motherboard issuses, due to bad factory solder from LG. Almost 90% problems are due to chips loosing BGA contact. This can be further proven by reflow-ing certain chip that actually gives back certain function to the phone. Here is the list

Blue screen: Sandisk memory chip
Screen flicker: analogix chip
wifi not turning on/wifi grayed out/wifi and BT not working: WCN chip
restart: RAM memory chip

So, I will buy necessary equipment for reballing but I would like to ask anyone who maybe knows, what causes these issues:

Invalid sim card/sim removed

is this RF chip, or SIM slot, and how could I know what makes this problem ? I know how to replace sim slot, I have that much level of experience, but I still dont know how to reball chips. And it seems to me that RFMD chip is not connected via BGA but rather side-pins ?

Can anyone with expertise help me on what is what ?

tnx to all in advance

Smoky_Eye · 03-17-2017, 15:13

Hello friend did you find any solution with blue screen problem ? If we reball the memory chip you think it will be ok ? Or needs replacement ?

Sent from my iPhone using Tapatalk

msajjas · 03-19-2017, 06:35

Blue screen is 90 percent fixed by reflowing display side wise copmonents .
Secondly light heat up cpu section

02-21-2017, 14:30	#1 (permalink)
Igoritza Junior Member Join Date: Feb 2009 Posts: 5 Member: 974800 Status: Offline Thanks Meter: 2	G3 motherboard problems Hello all I recently got a shipment of 15 units of G3 from a german company which released them for recycling In the meantime I realized that this phone has serious motherboard issuses, due to bad factory solder from LG. Almost 90% problems are due to chips loosing BGA contact. This can be further proven by reflow-ing certain chip that actually gives back certain function to the phone. Here is the list Blue screen: Sandisk memory chip Screen flicker: analogix chip wifi not turning on/wifi grayed out/wifi and BT not working: WCN chip restart: RAM memory chip So, I will buy necessary equipment for reballing but I would like to ask anyone who maybe knows, what causes these issues: Invalid sim card/sim removed is this RF chip, or SIM slot, and how could I know what makes this problem ? I know how to replace sim slot, I have that much level of experience, but I still dont know how to reball chips. And it seems to me that RFMD chip is not connected via BGA but rather side-pins ? Can anyone with expertise help me on what is what ? tnx to all in advance

03-17-2017, 15:13	#2 (permalink)
Smoky_Eye Freak Poster Join Date: Apr 2013 Posts: 212 Member: 1921245 Status: Offline Thanks Meter: 43	Hello friend did you find any solution with blue screen problem ? If we reball the memory chip you think it will be ok ? Or needs replacement ? Sent from my iPhone using Tapatalk

03-19-2017, 06:35	#3 (permalink)
msajjas Crazy Poster Join Date: Jan 2012 Location: MS Repairing zone Karachi Age: 42 Posts: 57 Member: 1712378 Status: Offline Thanks Meter: 1	Blue screen is 90 percent fixed by reflowing display side wise copmonents . Secondly light heat up cpu section