How to Upgrade, Repair, Disassemble a PDA or Handheld PC: HOWTOs & FAQs

• free PDA repair videos and HOWTOs
• THE FRUGAL HANDHELD - Do-it-yourself handheld repairs.

Chipset, Pinout, Connector and Electric Circuit Specifications, Manuals

• Zytrax: specifications for almost all electronic devices and accessories.
• Lessons In Electric Circuits A free series of textbooks on the subjects of electricity and electronics.
• LED-Museum
• The Hardware Book - Internet's largest free collection of connector pinouts and cable descriptions.
• Handbook of hardware pinouts, cables schemes, connectors layouts for computers, cell phones and other devices.
• AllManuals: Free manuals for computer and peripheral devices in PDF format

Surface Mounted Devices - SMD Soldering

• Surface Mount Technology SMD - A Beginner's Guide (includes soldering instructions).
• Surface mounting with hand-soldering tools