XO 1.75 A3 ECOs: Difference between revisions
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This corrects a wiring mistake ([http://dev.laptop.org/ticket/10974 Trac ticket 10974]). |
This corrects a wiring mistake ([http://dev.laptop.org/ticket/10974 Trac ticket 10974]). |
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* Wire +3.3VA_AUDIO (U24.5) to +3.3V_AVDD (C218). |
* Wire +3.3VA_AUDIO (U24.5) to +3.3V_AVDD (the side of C218 closest to the codec). |
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It has not been done to many boards. |
It has not been done to many boards. Marked AUDIO on the tag. |
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[[Category:Hardware]] |
[[Category:Hardware]] |
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Revision as of 22:28, 8 June 2011
These are recommended engineering change orders (ECOs) to the A3 prototype of the XO-1.75 laptop. This is NOT a list of changes from A3 to B1, that is located elsewhere.
SMBus Pullups
These correct a mistake omitting the pullup resistors for the SMBus between the EC and the battery charger. It has been done to all boards.
- Add a 1.3K resistor between PR200 and +3.3VSUS (available at PD31, pin 2).
- Add a 1.3K resistor between PR201 and +3.3VSUS.
External SD Power
This corrects a wiring error. It has been done to all boards.
- Tie PQ64.2 to Q22.2
Audio Power
This corrects a wiring mistake (Trac ticket 10974).
- Wire +3.3VA_AUDIO (U24.5) to +3.3V_AVDD (the side of C218 closest to the codec).
It has not been done to many boards. Marked AUDIO on the tag.