Ramon,
Thanks for the reply.
Can I made the suggestion that such boards are only for lab testing but
are not applicable for field use?
Regards,
Wee Mei
Dehoyos, Ramon wrote:
> Wee Mei:
> In my opinion it is the same problem. The board was cleaned but
>there was an area where contamination was left or it was splashed with a
>liquid after it was cleaned. We had a similar problem, a board was left
>immersed in alcohol accidentally for a little too long for that board and
>the solder mask lifted off the board. I have tried to repeat the same
>problem by leaving boards for much longer time in alcohol. So far it has
>not happened. It has to be a bare board problem. In a way it is better that
>it happens in house and scrap the boards than it happens out in the field.
> Regards,
> Ramon
>
>
>
>>-----Original Message-----
>>From: Lum Wee Mei [SMTP:[log in to unmask]]
>>Sent: Tuesday, January 13, 2004 6:26 PM
>>To: [log in to unmask]
>>Subject: [TN] Snake Board Part II?
>>
>>Hello,
>>
>>While Steve had your attention to his "Snake Board", what is the likely
>>casue on my soldermask problems?
>>
>>Thanks and regards,
>>Wee Mei
>>
>>Steve Gregory wrote:
>>
>>
>>
>>>Hi All!
>>>
>>>Back on January 6, Wee Mei had asked me to post some pictures for him,
>>>
>>>
>and
>
>
>>>then he posted the question below.
>>>
>>>Well, I've been gone since the beginning of the week (up in nice, warm,
>>>Burlington, Ontario Canada), and am just now getting around to posting
>>>
>>>
>his pictures
>
>
>>>for him. You can see the pictures at: http://www.stevezeva.homestead.com
>>>and look at "soldermask 1-3"
>>>
>>>-Steve Gregory-
>>>
>>>
>>>
>>>
>>>
>>>>----- Original Message -----
>>>>From: "Lum Wee Mei" <[log in to unmask]>
>>>>To: <[log in to unmask]>
>>>>Sent: Tuesday, January 06, 2004 1:45 AM
>>>>Subject: [TN] Solder Mask Defects - What casue it.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Hello,
>>>>>
>>>>>I have asked Steve to download the picture at his site. Once it ready,
>>>>>can someone take a look and give me your opinion what is the likely
>>>>>
>>>>>
>cause.
>
>
>>>>>Background : The board was partially mounted previously. It come back
>>>>>to mount the remaining 6 chips. The board was washed as per normal with
>>>>>Ensolv and assembled immediately. As the operator solder the chip, she
>>>>>noticed scale-like defects appearing on the soldemask around the whole
>>>>>stretch of the solder pads. The defects are more prominent on the left
>>>>>side compare to right of the chip. This is repeated for the rest of the
>>>>>5 chips.
>>>>>
>>>>>Being naughty, she touched the board surface with the soldering iron
>>>>>
>>>>>
>tip
>
>
>>>>>and found on the same spot the same defect appearing.
>>>>>
>>>>>One more information : defects found on these 2 boards have a much more
>>>>>rough surface compare to other pieces within the same batch.
>>>>>
>>>>>How the information is sufficent for you to provide opinions.
>>>>>
>>>>>Thanks and regards,
>>>>>Wee Mei
>>>>>
>>>>>
>>>>>
>>>>>
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