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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:29 AM
Replies: 7
Views: 115
Posted By mon2
Re: Macbook Pro A1708 820-00875 No boot

Good voltage.

What is the voltage of PPBUS_G3H ? (U7000)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:39 AM
Replies: 28
Views: 326
Posted By mon2
Re: Acer A315-55G / DA0ZAWMB8E0 not charging

Check the resistance to ground of each large coil. Remove all power.

Something is causing the power rail to shutdown. Start with the 3v3 rail used for the ILIM pin.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:24 AM
Replies: 7
Views: 115
Posted By mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:47 AM
Replies: 28
Views: 326
Posted By mon2
Re: Acer A315-55G / DA0ZAWMB8E0 not charging

This is odd and believe it should not be 0v. Will review a bit later. See the datasheet for details of this pin. If 0v, there is nothing to do.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:44 AM
Replies: 7
Views: 115
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:39 AM
Replies: 7
Views: 115
Posted By mon2
Re: Macbook Pro A1708 820-00875 No boot

Check the voltage on the esd dual diodes found on the battery connector for starters.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:18 AM
Replies: 28
Views: 326
Posted By mon2
Re: Acer A315-55G / DA0ZAWMB8E0 not charging

What is the voltage of pin #21 = ILIM ?

This must be a ref voltage value > 0v to function.
Forum: Schematic Requests ONLY! Yesterday, 03:22 PM
Replies: 1
Views: 43
Posted By mon2
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.
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:17 AM
Replies: 9
Views: 225
Posted By mon2
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.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:39 AM
Replies: 9
Views: 225
Posted By mon2
Re: a1989 5V 0,25A

What is the voltage of PPBUS_G3H ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:20 AM
Replies: 6
Views: 186
Posted By mon2
Re: Odd One: 820-00923, Won't Boot to External on 2 Ports

Review the connector @ J3300. Remove all power.

Meter in diode mode.

Red meter probe to GROUND.

Black meter probe to test pin 1 of this connector. Measure the reading.

Then continue to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:05 AM
Replies: 10
Views: 477
Posted By mon2
Re: Asus G531GW rev. 1.6

Bios requests is a different forum on this website.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:04 AM
Replies: 28
Views: 326
Posted By mon2
Re: Acer A315-55G / DA0ZAWMB8E0 not charging

OMG.

1) Were the chips sourced through Aliexpress ?

here are some shops we trust and have used often:
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:18 AM
Replies: 28
Views: 326
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:57 AM
Replies: 12
Views: 164
Posted By mon2
Re: A1286 820-2915b chime ok, but no image no bklight

Well done! Thanks for the update.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:53 AM
Replies: 28
Views: 326
Posted By mon2
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 -...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:13 AM
Replies: 28
Views: 326
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:01 AM
Replies: 10
Views: 118
Posted By mon2
Re: Dell Alienware 17 R4 BAP10 LA-D751P, cpu b+ shorted?

Multilayer pcbs like this one will have lots of heavy copper. This will make parts removal and soldering difficult. Do consider to buy an underside preheater to help. We recently bought the Hakko...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 03:56 AM
Replies: 28
Views: 326
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 12:24 PM
Replies: 17
Views: 179
Posted By mon2
Re: DELL latitude e7470 does not recognize dell charger

Yes, please see my last post. Link was refreshed for a store that offers the PESD5V0S2UAT.

To date, have not had a sour JAFFA ORRI orange. They are a bit pricey ($6.00 CAD for 10) but well worth...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 12:11 PM
Replies: 17
Views: 179
Posted By mon2
Re: DELL latitude e7470 does not recognize dell charger

Good to hear it is working. Summary - the ESD diode died and caused a heavy load on the communication line. Respectively, the host logic board's EC controller was unable to communicate with the power...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 10:21 AM
Replies: 28
Views: 326
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 09:54 AM
Replies: 17
Views: 179
Posted By mon2
Re: DELL latitude e7470 does not recognize dell charger

I think you should as these parts are sacrificial under harsh events. The component took a hit to (ideally) prevent damage to the components downstream on this circuit.

For now, you can use the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 04:45 AM
Replies: 17
Views: 179
Posted By mon2
Re: DELL latitude e7470 does not recognize dell charger

Good reading. Test again with your adapter.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-17-2022, 04:44 AM
Replies: 28
Views: 326
Posted By mon2
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.
Showing results 1 to 25 of 500

 
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