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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sun Jan 27, 2013 9:38 pm Post subject: WTF happened to this circuit board |
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This is the bottom side of a Niles 12 channel amp power supply. Every trace on the bottom looks like this and every trace on the top looks normal. I pulled the supply to check for bad solder joints or something. SOMETHING is what I found.
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Sun Jan 27, 2013 9:47 pm Post subject: |
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Hi,
I've seen PCBs like this before. No need to worry. Sometimes solder gets under the PCB coating during flow soldering and then it will look like this. Sometimes it's intentional. The solder adds to the trace's power rating...
Regards,
barclay66
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Sun Jan 27, 2013 9:49 pm Post subject: |
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Nothing serious. It's just because of bad quality solder-stop paint, or badly adjusted wave-solder equipment, or they did this intentionally to lower tha resistance of the traces. What you see is just the solder gone under the solder-stop paint, you can verify this by heating up one trace.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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