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After so many attempts I would let this chip rest in peace.
Do you put new solder balls after each attempt?
If you want to be successful don't waste your time on this chip any longer:
- order a chip with new balls
- de-solder the faulty chip and remove all the excess solder off the board with your wick
- make sure the pads are as clean and even as possible
- put flux on the pads (not too much)
- align the new chip on the pads and when you're sure it is aligned push a little bit harder on it so it doesn't float on the flux
- now apply heat on the chip. make sure your air is not to high and not blows your chip away
- if the chip is only 90% aligned it doesn't mater you will see how it moves in place when the solder melts
- don't be inpatient and touch the chip while it is floating on the solder!
- let it cool down and make an inspection
- reflow if necessary
- I use a preheater to heat up the whole board for better results and less stress
hey I change SMC once more , and now machine turn on again , and I have green light and orange , I run as and now I only have 1 bad sensor TA0P all the others show ok , how I can diference witch one is it?
Can you remind me the full name of it? It usually says fin stack sensor, proximity sensor, pbus voltage sense, etc. TA0P what? I don't know it off the top of my head. I am guessing it is one of the sensors near U5511
-124 means nothing is connected to the sensor. You can bridge the 2 sense wires together and I think it will read 8C or something, try if it reacts to that.
There is no way to find the exact sensor. Some diagrams have them listed and you need to figure out what they are on another diagram. I still think bad solder on U5511 or dead Q5520. Or we are looking at the wrong sensor, you can remove Q5520 and see if an extra error pops up.