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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 09:51 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

Tomorrow, also check the resistance to ground of vreg5 (pin 29) which you have reported is also fluctuating ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 09:30 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

Do wait for other comments but there is someone who is partially shorted on this consumer side of the rail.

Suggestion is to inject 1 volt (not higher) but ok to use higher current. The idea is to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 09:02 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

That is too low of a resistance for this rail. This is likely causing the fault with the current sense loop observing a heavy load and power pulsing this rail.

With flux and patience, lift up one...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 08:42 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

Remove all power. Meter in resistance mode.

What is the resistance to ground of PP3V3_S5_REG_R ? (L7560)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 08:40 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

What is the 820-**** board number for your unit ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 02-07-2023, 05:24 AM
Replies: 16
Views: 389
Posted By mon2
Re: Macbook Air A1466 Fluctuating 3v supply

What is the ppbus_g3h voltage to ground? (Check at the fuse)

Is the 3v42 rail stable?
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