T3-50T amperage on one of my board block at chip UT1

[dartx]

I tried to repair the first board on my T3 and my signal SDO doesn't go through chip UT1.
I change the chip 3 times but the problem remain.

I notice that the amperage keep rising when the board get hotter and stop
at 10A after that all signal go trough chip UT1 but they are messed up

can anyone help me on this?

[1715554572]

1715554572

[1715554572]

1715554572

[1715554572]

1715554572

[lightfoot]

How are you trying to change the chip? What tools/heat settings/flux/solder masks?

[dartx]

How are you trying to change the chip? What tools/heat settings/flux/solder masks?

Well I take the defective board out of the miner, take all the heat sink off the board, heat both side of the board at 300 degree and then i can change the chip i need to. I dont know if this forum will be helpful with that kind of problems.

[lightfoot]

Ok. If it is a QFN chip I have had problems in the past with them seating properly on the pads. Solution was a fine layer of flux first, then chip. Zephlux seems to work pretty well.

Some of us have experience with surface mounted repair.

[dartx]

Always doing that but one thing I was doing before was adding tin on my chip before soldering it to the board. Now i just dont and it help a lot with that kind of problems.