Electronics Forum | Thu Jul 12 20:20:31 EDT 2007 | seankim10
I�m having problem with PCB with 16mil thickness due to warpage. the board convex up in the middle after 1st reflow. It seams the warpage is caused by CTE mismatch between PCB and multiple TSOP's, which are covering ~80% of the bottom side board area
Electronics Forum | Sat Aug 18 11:23:10 EDT 2007 | Learn From U
Hi All, Via X-rays, we found solder voids appear on PTH location, especially on Dimm connectors area. We think this should be related to PCB issue as we found solder unable to fill up the PTH hole during bare board testing at wave soldering machi
Electronics Forum | Thu Feb 21 04:41:37 EST 2008 | mun4o
hi,Toni, we use only FR4.Some of PCB we order in China and Taiwan.With these PCBs we can't any problem.Other PCB we order here in Bulgaria.The problems with voids start last year - we have voids only in PCBs from Bulgarian factory.The process is sam
Electronics Forum | Wed Nov 14 14:44:10 EST 2007 | grantp
Hi, Those via's sure do sound large, and I think the designer must have made a mistake in the PCB design do you think? From looking at our PCB designs, if we moved to via in pad, it would really reduce the size of the PCB, so this is an important i
Electronics Forum | Wed Nov 21 15:02:46 EST 2007 | jlawson
From info I have been told from design standpoint, via in pads helps with managing EMC issues with working design, in particular for high speed digital/dense populated type PCB's. We had a manufacturing customer that had very low yield because of th
Electronics Forum | Thu Feb 14 04:38:43 EST 2008 | marjorie
Anyone knows why BGA fell off sometimes from the board? I was running in a single sided only. I encountered a BGA falling off from the pcb pad. The pcb is ENIG and lead free process. The pads had no solder and didn't looks like having a black pad thr
Electronics Forum | Tue May 20 06:14:32 EDT 2008 | roc2x
Hi, Im qulifiying 2 PCB supplier and supplier A has no defect found but supplier B got 4 defective cards and 4 are same failure. 4 cards having lifted pad after reflow in same BGa location. I run the 2 PCb supplier in one reflow,using same profile,sa
Electronics Forum | Thu Aug 21 05:08:09 EDT 2008 | ihamon
Hi, We had a electric failure on a printed wired board after a few hours of functionning. We determined that the failure was caused by a open circuit in the PCB internal layer near to a via. We performed a microsection but unfortunately, it seemes t
Electronics Forum | Thu Aug 28 11:02:28 EDT 2008 | omid_juve
we have two similar pcb from two different pcb manufacturer one of them passed the wave soldering without any short circuit and residue and another one passed it with many residue . don`t you think that the type of solder mask from these two pcb manu
Electronics Forum | Wed Sep 24 04:18:12 EDT 2008 | gang
we have some problems in soldering joints such as insufficient solder and misalignment on some RC0402 and CC0402,i don't have a pic here. our SMT enginner doubts the PCB land pattern is at the fault.here is what we measured results.pad length:0.9mm,
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