Electronics Forum: black spots (Page 1 of 4)

Re: Black spots on gold finish pads.

Electronics Forum | Mon Nov 30 23:45:20 EST 1998 | Kallol Chakraborty

Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection /te

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 07:24:44 EST 1998 | Earl Moon

| Hi folks , | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 07:54:49 EST 1998 | kallol chakraborty

| | Hi folks , | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspec

Re: Black spots on gold finish pads.

Electronics Forum | Tue Dec 01 09:02:18 EST 1998 | Earl Moon

| | | Hi folks , | | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our in

Re: Black spots on gold finish pads.

Electronics Forum | Fri Dec 04 20:26:34 EST 1998 | kallol Chakraborty

| | | | Hi folks , | | | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Ou

Re: Black spots on gold finish pads.

Electronics Forum | Fri Dec 04 20:37:45 EST 1998 | kallol chakraborty

| | | | | Hi folks , | | | | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most

White spots on PCBA after Selective Solder

Electronics Forum | Fri Sep 11 15:27:50 EDT 2015 | u4bga

Hi! We're noticing white spots on 2 PCBAs after the selective soldering & DI Wash processes. ----Facts---- 1) The marking is on all boards, irrespective of date code 2) It only happens on leads that have been selective soldered 3) The pattern of w

Re: Black spot on Gold Pads

Electronics Forum | Mon Nov 27 17:31:34 EST 2000 | Dave F

Send the boards back the fabricator and have another set made by someone else.

Black spot on Gold Pads

Electronics Forum | Sat Nov 25 18:45:19 EST 2000 | Ashok Dhawan

I am getting black spots / stuff while I run gold finish PCB through reflow soldering process using NC solder paste.The affected spots have intermetalic as black in color. Does not solder very well. I did look at the archieve but could not find info

Re: Black spot on Gold Pads

Electronics Forum | Tue Nov 28 21:07:44 EST 2000 | Alvin K

Gold is porous and spots on gold plated PCBs is one of the drawbacks of using gold as a solderability protector. Base Nickel exposure seems to be the cause of this and is aggravated when the gold thickness is less than what it should be. I agree with

  1 2 3 4 Next

black spots searches for Companies, Equipment, Machines, Suppliers & Information