I9300 Stuck in UART Mode After eMMC Repair - GSM-Forum

connexion2005 · 01-22-2014, 21:48

Hi there,

Does anyone have a solution for I9300 which is stuck in UART mode after eMMC repair? I have around 3 pieces like this after eMMC is replaced. Device freezes and locks up while in PDA setting and reboots. After it is in UART mode only (*#7284#).

Thanks!

connexion2005 · 01-27-2014, 06:16

Any ideas on this guys?

debeliamark · 01-27-2014, 06:34

Quote:

Originally Posted by connexion2005

Any ideas on this guys?

Probably U506 is afected ... i have nearby same issue after eMMC replacement on 2 pcs - there heating when desolder old eMMC chip can partialy damage soldering under U506

connexion2005 · 02-02-2014, 06:31

Thanks for the reply. U506 does indeed become unsoldered and need replacement but in this case, it is not my problem. It must be some other voltage overload component that is damaged from heating causing this issue as the phone tries to boot with standard PDA mode enabled in *#7284# settings, then freezes and crashes and reboots with UART mode enabled instead which is also very unstable.

debeliamark · 02-02-2014, 08:02

Quote:

Originally Posted by connexion2005

Thanks for the reply. U506 does indeed become unsoldered and need replacement but in this case, it is not my problem. It must be some other voltage overload component that is damaged from heating causing this issue as the phone tries to boot with standard PDA mode enabled in *#7284# settings, then freezes and crashes and reboots with UART mode enabled instead which is also very unstable.

Yes - probably you can check nearby PMIC generated voltages - sometime happening - i'm in fighting now to find what is missing on one SGS3 that cannot catch network due to not see CP part after EMMC replacement ...

connexion2005 · 02-02-2014, 08:16

It seems the issue I'm having is related to CP not getting sufficient power from some source. It is causing it to lag the system and crash it and switches from PDA to UART. Also locks up when the screen is off for an extended period of time.

connexion2005 · 02-08-2014, 08:41

End result I believe is poor grounding of CP NAND chip within eMMC chip.

Sent from my LG-D800 using Tapatalk

laptopmd · 02-12-2014, 14:05

Quote:

Originally Posted by debeliamark

i'm in fighting now to find what is missing on one SGS3 that cannot catch network due to not see CP part after EMMC replacement ...

I have same problem as you, after replacing an EmmC, no more CP.

I have tried to replace the chip without result..

connexion2005 · 06-01-2014, 21:49

Bump. I still have problems with this on the I9300 only. Anyone else seen this?

01-22-2014, 21:48	#1 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	I9300 Stuck in UART Mode After eMMC Repair Hi there, Does anyone have a solution for I9300 which is stuck in UART mode after eMMC repair? I have around 3 pieces like this after eMMC is replaced. Device freezes and locks up while in PDA setting and reboots. After it is in UART mode only (*#7284#). Thanks!

01-27-2014, 06:16	#2 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	Any ideas on this guys?

02-02-2014, 06:31	#4 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	Thanks for the reply. U506 does indeed become unsoldered and need replacement but in this case, it is not my problem. It must be some other voltage overload component that is damaged from heating causing this issue as the phone tries to boot with standard PDA mode enabled in *#7284# settings, then freezes and crashes and reboots with UART mode enabled instead which is also very unstable.

02-02-2014, 08:16	#6 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	It seems the issue I'm having is related to CP not getting sufficient power from some source. It is causing it to lag the system and crash it and switches from PDA to UART. Also locks up when the screen is off for an extended period of time.

02-08-2014, 08:41	#7 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	End result I believe is poor grounding of CP NAND chip within eMMC chip. Sent from my LG-D800 using Tapatalk

06-01-2014, 21:49	#9 (permalink)
connexion2005 Freak Poster Join Date: Jan 2011 Posts: 355 Member: 1501506 Status: Offline Thanks Meter: 47	Bump. I still have problems with this on the I9300 only. Anyone else seen this?