Realtek ALC269 audio codec datasheet in PDF form, 1.25 MB; the extra (1) in the name only marks a duplicate copy. The ALC269 is a High Definition Audio codec found on many laptop motherboards, driving speakers, headphones and microphones. The document covers pinout, power supply pins, HDA link signals and reference circuits. Use it to check the codec supply voltages, trace the HDA bus to the chipset, find headphone jack sense lines and diagnose missing sound or a shorted audio rail.
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