Training course material on basic electronics repair, 7.26 MB PDF, catalogued with schematics although it is an educational guide rather than a board diagram.

Basic electronics course in PDF form attributed to Humphrey Kimathi, 4.45 MB, filed under schematics but in practice a learning text.

Large Spanish course PDF, 15.6 MB, on basic electronics applied to mobile device repair.

Topic 2 of a Spanish smartphone repair course, covering basic electronics, as an 817 KB PDF that appears to duplicate the unnumbered copy. No device or board is named.

Spanish-language PDF course on basic electronics for mobile phones, filed under schematics but in practice a training document rather than a diagram for one model.

Opening topic 1 of a Spanish course on mobile telephony fundamentals, a 343 KB PDF. No phone model or brand appears in the name.

Spanish-language course chapter on basic electronics, provided as an 817 KB PDF and apparently the same content as the numbered topic 2 of the series.

Short electronics course in Spanish, a 1.26 MB PDF catalogued with schematics but evidently a teaching document rather than a circuit for a particular device.

Portuguese introductory study material on digital electronics, the first part of a course series judging by the numbering in the name.