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PC Circuit Board Solder Appears Dull or Oxidized

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This document explains why the solder or connectors on new PC circuit boards may appear dull or oxidized.

New lead-free PC circuit boards use a different type of solder finish

If you examine the PC boards in your new HP or Compaq PC or receive a new circuit board from HP to install in your PC, you may expect the connectors to be shiny gold-colored and the solder pads and traces to be bright tin-colored. Don't be disappointed if the connectors, pads, or traces appear dull or oxidized, with a discoloration ranging from pale yellow to brilliant blue! The new boards contain a lead-free immersion silver-surface finish that is in compliance with all applicable laws and regulations.

Immersion silver-surface finish boards may cosmetically tarnish

A lead-free printed circuit board with immersion silver-surface finish offers great advantages as a replacement for a board with a tin/lead hot air solder level (HASL) surface finish, with one disadvantage - the silver surface can tarnish after manufacture due to sulfur or chloride exposure from the environment. While such exposure from the environment is small and occurs regularly, the tarnish it produces on electronic products is extremely thin and does not diminish the performance or operation of the product.
So when you inspect your new circuit board with an immersion silver-surface finish, be assured that any discoloration on your board is simply cosmetic, and does not diminish its function or performance.

Material use and restrictions

HP products are designed to minimize energy use, use environmentally responsible materials, and be recycled easily. For more than 10 years, HP has actively investigated alternatives to lead use in its electrical and electronic products while ensuring that product quality is not compromised.
Since lead and lead compounds, such as the tin/lead used in tin/lead HASL surface finish circuit boards, are deemed hazardous substances, they are included in the European Union Restriction of Hazardous Substances (RoHS) Directive.
The RoHS Directive restricts the use of certain substances (lead, mercury, cadmium, hexavalent chromium, and two flame retardants - PBB and PBDE) in electrical and electronic products sold in the European Union after July 1, 2006. HP had already restricted four of the substances prior to 1999 and is actively ensuring that all substances regulated by RoHS are restricted in every HP hardware product.
HP's goal is to exceed compliance obligations by meeting the requirements of the RoHS Directive on a worldwide basis. HP shipped our first fully RoHS-compliant products in early 2005.

HP's commitment to the environment

HP is committed to design innovation and environmental responsibility for the materials we use and products we produce. Visit us on the Web for more information on HP's global citizenship objectives and commitment to the environment (in English).
HP Pavilion 901 CTO Desktop PC

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