Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Today, 03:44 AM
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Replies: 7
Views: 115
Re: Macbook Pro A1708 820-00875 No boot
Every design by apple has an esd diode on the battery for the smbus interface (scl and sda). Used for communication with the BMS board in the battery pack.
Measure the voltage of these sda and scl...
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Forum: Schematic Requests ONLY!
Yesterday, 03:22 PM
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Replies: 1
Views: 43
Re: Hp Stream with charging issue
I do not see the schematic in my database which is fairly exhaustive. The schematic may not be public yet.
Post clear pics of the battery charger IC along with the topside markings of the IC.
...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 11:17 AM
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Replies: 9
Views: 225
Re: a1989 5V 0,25A
Review the diode readings of each LDO rail of the CD3215 as per post #2.
Remove all power. Meter in diode mode to measure.
One of the causes of being stuck @ 5V is that a CD3215 has failed.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 05:18 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
Based on the posted measurements, believe that the charger IC is pulling this line down.
I know that this part has been replaced a few times. Are you confident on the reflowing of the replacement...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 04:53 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
No - wait - no cutting of traces and do not inject voltage, yet. So they must be using a direct PCB trace for the PR30 location on the PCB.
Something is pulling this voltage divider rail to 0v -...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 04:13 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
Ok. Good.
There is a resistor or solder blob between point #2 and point #3.
Remove this part (pr30) or short.
Then check the voltage again without this resistor.
Measure at point #2 with...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 03:56 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
Remove all power.
Meter in resistance mode (higher than 100k scale).
Check the resistance with probes on point #1 and #2.
We want to check the resistance of this resistor.
Next, check the...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-17-2022, 10:21 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
1) ACOK is not OK. Under the posted measurements and as documented in the TI datasheet, pin # 5 should be HIGH. However, this is an open-drain pin so the logic high really means the pin will be...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-17-2022, 04:44 AM
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Replies: 28
Views: 326
Re: Acer A315-55G / DA0ZAWMB8E0 not charging
Measure the voltage on each pin of the charger IC using only the external dc adapter (no battery). Do this carefully to avoid damage from slipping of the meter probes.
Post each measurement.
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