samsung i9505 (s4) no sim already change sim reader - Page 5 - GSM-Forum

serviceassist90 · 04-17-2015, 00:26

Quote:

Originally Posted by loomingx

It is the U204 that needs to be reflowed/replaced. This "fix" only works because it is in close proximity to the incorrect component that you're reflowing.

According to the schematics I have, the U204 is on the opposite side of the board, and nowhere near the components being reflowed here... And a search of the U204 part number tells me it's a pressure sensor IC... So now I'm even more confused.

I don't currently have an S4 board suffering from the "no sim" issue, so I can't try the fix, but it doesn't sound right to me.

loomingx · 05-08-2015, 22:12

The U204 is the Broadcom 20794S1A standalone NFC chip underneath the sim tray flex and emi heat shield.

Look at the picture of Step 15:

https://www.ifixit.com/Teardown/Sams...Teardown/13947

adaseb · 05-15-2015, 03:57

Quote:

Originally Posted by loomingx

The U204 is the Broadcom 20794S1A standalone NFC chip underneath the sim tray flex and emi heat shield.

Look at the picture of Step 15:

https://www.ifixit.com/Teardown/Sams...Teardown/13947

What does the NFC chip have to do with the Sim card? Doesn't seem like the right chip to reflow

adaseb · 05-15-2015, 04:08

In the Schematic U204 is on the otherside as the Broadcom Chip, that NFC Broadcom chip is U203 not U204

vishal kapoor · 05-15-2015, 14:14

Quote:

Originally Posted by raizen23

work for me thanks. just reheat

100% work for me also thanks

adaseb · 05-17-2015, 22:05

Are you sure its that IC or that Broadcom Chip and not the sim card connector instead?

Basically what is in the white box? I reflowed both those ICs and Broadcom chip and had the same error. Then on some forum a few people put tape on the Sim card connector so there was more pressure on the connector and the error went away, so I reflowed the Sim card connector and the problem seems to have gone away.

When you reflow that IC chip its very close to the sim card connector and thats why it works.

I looked under a magnifining glass and didn't see any of the pins broken but maybe they were nano cracks and a small reflow fixed the issue.

Because those ICs and Broadcom chip have nothing to do with the sim card.

loomingx · 05-25-2015, 15:42

My schematics are for an i337 where the Broadcom chip is labelled as U204. Sim cards can be NFC enabled. This is 100% the ic that needs to be reflowed/replaced.

debeliamark · 05-25-2015, 16:19

Quote:

Originally Posted by loomingx

My schematics are for an i337 where the Broadcom chip is labelled as U204. Sim cards can be NFC enabled. This is 100% the ic that needs to be reflowed/replaced.

You are wrong ... this ( reflow near to flash diode ) work just because is on baseband ic MDM9215 ... the SIM is handled by modem part

loomingx · 05-26-2015, 17:25

I've replaced this NFC chip several times to fix the no sim card error. Believe what you like.

adaseb · 05-31-2015, 03:44

LOL!

I think you are all wrong and its the sim card+sd card connector that needs to be reflowed.

Basically what is in the WHITE RECTANGLE in the above photo.

In other threads people solved their issue by adding tape to apply pressure on that connector. I reflowed that connector and it solved the problem. Before I reflowed both the IC and the Broadcom NFC chip and didn't fix the error.

Why it works when you reflow the IC or the NFC Chip is because its very close to the Sim card connector pins which reflow at lower heat because they aren't surface mount but exposed.

kuli · 06-15-2015, 11:07

hi all
i read 7 pages of how heat the near sim chip from sim reader connector.........totally wrong
the sim chip or driver or call how you like is QUALCOMM MDM9215m acordig to schematics.... other forum user says with a litle presure disipear insert sim problem....
now i use a microscope and big surprise .....on the other size of the litel black chip what all heating is the QUALCOMM MDM9215M chip, more exactly 2 Capacitor (near QUALCOMM MDM9215M)...see in the picture... what was unsoldered.... I us weller rework station and i fix this desoldered capacitors...now no more insert sim problem ...

enjoy

bartonek · 06-16-2015, 12:55

Quote:

Originally Posted by kuli

hi all
i read 7 pages of how heat the near sim chip from sim reader connector.........totally wrong
the sim chip or driver or call how you like is QUALCOMM MDM9215m acordig to schematics.... other forum user says with a litle presure disipear insert sim problem....
now i use a microscope and big surprise .....on the other size of the litel black chip what all heating is the QUALCOMM MDM9215M chip, more exactly 2 Capacitor (near QUALCOMM MDM9215M)...see in the picture... what was unsoldered.... I us weller rework station and i fix this desoldered capacitors...now no more insert sim problem ...

enjoy

Thanks a lot. 100% work

us love · 06-19-2015, 11:14

Galaxy s3 mini camra and min not working plz help me

Sent from my GT-I9300 using Tapatalk

okrongly · 06-26-2015, 15:44

Quote:

Originally Posted by kuli

hi all
i read 7 pages of how heat the near sim chip from sim reader connector.........totally wrong
the sim chip or driver or call how you like is QUALCOMM MDM9215m acordig to schematics.... other forum user says with a litle presure disipear insert sim problem....
now i use a microscope and big surprise .....on the other size of the litel black chip what all heating is the QUALCOMM MDM9215M chip, more exactly 2 Capacitor (near QUALCOMM MDM9215M)...see in the picture... what was unsoldered.... I us weller rework station and i fix this desoldered capacitors...now no more insert sim problem ...

enjoy

This is PROPER solution guys!

digikey · 06-30-2015, 17:10

Hi Guys the best is to stop argument and keep repairing that's all. It’s not who is best and right.

Br

05-08-2015, 22:12	#62 (permalink)
loomingx Freak Poster Join Date: Dec 2013 Posts: 100 Member: 2077936 Status: Offline Thanks Meter: 21	The U204 is the Broadcom 20794S1A standalone NFC chip underneath the sim tray flex and emi heat shield. Look at the picture of Step 15: https://www.ifixit.com/Teardown/Sams...Teardown/13947

05-15-2015, 04:08	#64 (permalink)
adaseb Freak Poster Join Date: Oct 2011 Posts: 343 Member: 1678566 Status: Offline Thanks Meter: 16	In the Schematic U204 is on the otherside as the Broadcom Chip, that NFC Broadcom chip is U203 not U204

05-17-2015, 22:05	#66 (permalink)
adaseb Freak Poster Join Date: Oct 2011 Posts: 343 Member: 1678566 Status: Offline Thanks Meter: 16	Are you sure its that IC or that Broadcom Chip and not the sim card connector instead? Basically what is in the white box? I reflowed both those ICs and Broadcom chip and had the same error. Then on some forum a few people put tape on the Sim card connector so there was more pressure on the connector and the error went away, so I reflowed the Sim card connector and the problem seems to have gone away. When you reflow that IC chip its very close to the sim card connector and thats why it works. I looked under a magnifining glass and didn't see any of the pins broken but maybe they were nano cracks and a small reflow fixed the issue. Because those ICs and Broadcom chip have nothing to do with the sim card.

05-25-2015, 15:42	#67 (permalink)
loomingx Freak Poster Join Date: Dec 2013 Posts: 100 Member: 2077936 Status: Offline Thanks Meter: 21	My schematics are for an i337 where the Broadcom chip is labelled as U204. Sim cards can be NFC enabled. This is 100% the ic that needs to be reflowed/replaced.

05-26-2015, 17:25	#69 (permalink)
loomingx Freak Poster Join Date: Dec 2013 Posts: 100 Member: 2077936 Status: Offline Thanks Meter: 21	I've replaced this NFC chip several times to fix the no sim card error. Believe what you like.

05-31-2015, 03:44	#70 (permalink)
adaseb Freak Poster Join Date: Oct 2011 Posts: 343 Member: 1678566 Status: Offline Thanks Meter: 16	LOL! I think you are all wrong and its the sim card+sd card connector that needs to be reflowed. Basically what is in the WHITE RECTANGLE in the above photo. In other threads people solved their issue by adding tape to apply pressure on that connector. I reflowed that connector and it solved the problem. Before I reflowed both the IC and the Broadcom NFC chip and didn't fix the error. Why it works when you reflow the IC or the NFC Chip is because its very close to the Sim card connector pins which reflow at lower heat because they aren't surface mount but exposed.

06-19-2015, 11:14	#73 (permalink)
us love Junior Member Join Date: Aug 2009 Posts: 1 Member: 1105652 Status: Offline Thanks Meter: 0	Galaxy s3 mini camra and min not working plz help me Sent from my GT-I9300 using Tapatalk

06-30-2015, 17:10	#75 (permalink)
digikey Freak Poster Join Date: Nov 2010 Location: uk Posts: 105 Member: 1434392 Status: Offline Thanks Meter: 10	Hi Guys the best is to stop argument and keep repairing that's all. It’s not who is best and right. Br