Re: I said i'll never try reballing...

Cool guys!

I use 2 probes one on the left and right side of the chip (if You are looking from above at the chip), sometimes up and down sides of the chip (if You are looking from above at the chip).

Like this ( * - marks the spot where the probes are):

-------*
///////////////////--------////////////////////
//..................//--------//...................//
//..................//--------//...................//
//......CHIP......//-OR---*//......CHIP.......// *
...

Re: I said i'll never try reballing...

I use 2 probes on opposite sides of the chip. I've never used probes ON chip.

Also, I used to cover chip with capton tape, but all it did is that the SMT components were lifted during heating... (I'm talking about SMT ON the chip)

I will try to use aluminum foil tape to cover whole chip in order not to cause crack of the chip (mirrored square). Sometimes I get little balls of solder over chip, which I guess is from second leyer of the chip (beneath the chip itself). I'm talking about solder balls which are inside...

Re: I said i'll never try reballing...

Thanks guys!
Very helpful!
Regarding my hommade machine... I use 2 temperature probes, and get even heat during preheat. When I apply above heating with my hot air station with a nozzle on it, I get slightly different temperatures on those two probes (~5*C). A few days ago I thought I should buy 2 more instruments, so I can cover all four spots around the chip.
A few months ago I bought a Kingbo flux, and couldn't beleive how easy it is to work with it. Before Kingbo, I used Chinese Amtec (fake), and all it did is damage......

Re: I said i'll never try reballing...

I am a newbee reballer too, I need an advice about cleaning pads on the board, and about aligning the chip in place after reballing. I get all of the 2 steps right, but in the end I get non functional Mobo or graphic card.
Firstly I built my own reballing machine which is consisted of hot air station above, and a grill below. I managed to do the clean lift, but I don't know if the chip is "healty" after all of those heating.
I usualy do like this:
1. Preheating below to a 150*C, then I apply above heat to 230*C I...

Helo all!
This is my first post, and I'd like to greet You all!
So, my problem is as follows... I am trying to fix a Chieftec PSU for a friend. This PSU has a bad 5V output. So, I checked all of the rectifyers, and all of them seem to be ok.
My problem goes deeper as I managed to burn zener diode ZD1 and transistor Q17 which is connected to a ZD1. I done this trying to measure voltage on zener ZD1, but accidentally touched adjacent pin and a big boom happened. I desperatly need markings on those two components (ZD1 and Q17)so I can buy the replacement and try to fix it further......