Testing/Replacing Ethernet IC

[tpaskell]

I have came across a few Xbox 360 units with Dead Ethernet chips. I have tried to tackle one, without success. It has the U1B2 Ethernet Controller IC. If it helps any I'm on a Falcon Board with NXE Dash. I have already put two different chips (From Dead Boards) on it using different methods. I have tried soldering each pin individually, Drag Soldering the pins, and using a hot air gun. On all three methods, with the two replacement chips, the unit will either boot to the Dash and work for a minute, or just RRoD instantly (Sometimes during boot) with Error Code 0002. The unit was working before i started (Without Ethernet Connectivity).

My main questions are how do I test one of these? And What is the correct procedure for removing and installing this chip? (I have done surface mount soldering on Samsung Drives, without problems. I have also done surface mount soldering on several different boards over the years, although this one is puzzling me.

Thanks for your Help!

Tristan

 

[Scrufdog]

0002 is generally an onboard power problem. Could be a mosfet is flaking out. Try one of your boot cycles that works for a moment and chek to see if you can find one that is overheating. Might not be that the chips are bad, but that they arent getting proper power. If nothing obvious is a problemm might wanna check the standby voltages on the board, and power up voltages.

 

[Scrufdog]

Also checked for 3.3v on either side if FB1B1. It's a built in 0.5A fuse for the ethernet chip. I believe this should be powered up while the xbox is off. It's powered by the standby 5v leg. Also check the voltages on U1F1 mosfet. Pin 4 is the output of 3.3v. Check these voltages both powered on and powered off.

 

[Scrufdog]

looks like pin 4 in actual the large soldered tab...

check this thread on voltage testing... http://team-xecuter.com/forums/showthread.php/84670-Power-Sources-Switched-and-Standby

 

[tpaskell]

Alright Thanks. I will check voltages. It was working before i swapped out the ship, So what would make it do this now?

EDIT: All voltages checked out okay. Some i wasn't able to test, as the points weren't on My MoBo. There isnt any chance it is the Ethernet Chip?

It was working before, so i replaced the chip. I only preheated the corner of the board with the chip, so nothing else would be affected.

 

[ZBeeblebrox]

I had a Falcon board that would boot, but had no internet connectivity. I replaced the IC, but still wouldn't recognize the network. I then reballed the southbridge chip and connection was restored. Just my two cents.

 

[tpaskell]

You you believe it may be south bridge related? If so i will reball that and see what happens!

 

[Antalpromille]

I had a Falcon board that would boot, but had no internet connectivity. I replaced the IC, but still wouldn't recognize the network. I then reballed the southbridge chip and connection was restored. Just my two cents.

I had a xenon that did that after a thunder strike, obviously it didnt help reballing SB at that case.

 

[ZBeeblebrox]

You you believe it may be south bridge related? If so i will reball that and see what happens!

It's very possible. Especially if it boots stock nand, but acts like ethernet cable is unplugged. Does it get the 169.xxx.xxx.xxx IP address when you try to connect? These are the symptoms that mine had, so if you have the ability, I suggest the southbridge reball.

 

[ZBeeblebrox]

I had a xenon that did that after a thunder strike, obviously it didnt help reballing SB at that case.

I agree that the southbridge is not the definitive answer. Just saying that if he's tried replacing the IC and checked the fuses with no luck, then the SB could be the culprit. Also, the port has a few resistors/capacitors inside it that can be damaged, so the OP can try replacing that, too. I replaced the IC and the port on my Falcon before reballing the SB, and neither was the answer.

 

[tpaskell]

Well i just reballed the SB. Waiting for it to cool now. I did find something suspicious though. After i lifted the chip, i noticed on the front side, there were two sets of two balls that were bridged. Both were one above the other. After i cleeaned it with braid, they were still bridged. I hope that didnt hurt anything. BTW this is a Falcon MOBO

 

[Scrufdog]

Southbridge is always possible. It controls the ethernet chip. Just to make sure, FB1B1 was good?

 

[tpaskell]

Ok Tested Reball. Booted to dash, which shortly Red Ringed 0002. So we are back to square one... Where is FB1B1? And how is it tested?

Edit, I found FB1B1, How do i test it?

 

[Antalpromille]

Ok Tested Reball. Booted to dash, which shortly Red Ringed 0002. So we are back to square one... Where is FB1B1? And how is it tested?

Edit, I found FB1B1, How do i test it?

measure it, it should read close to 0 Ohm.

 

[tpaskell]

IT measures 00.2 Ohms

 

[Scrufdog]

When the machine is running it should be 3.3 v on both sides of it.

 

[tpaskell]

Okay, So after more testing, There is 3.3V on both sides. I have also replaced the Port itself, to no avail. It no longer gets the random red ring, but there still is no internet connection.

 

[Scrufdog]

Well, at this point you've fixed just about everything it could be. I can look up specific supply voltages for the ethernet chip if you want.

 

[gizmo613]

upload some pictures. of the area around the ic chip

 

[Scrufdog]

When powered up check for 3.3v on pins 7,14,18,22,24,33,45,48. Check for ground on pins 2,5,11,17,21,25,36.