Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-04-2022, 05:31 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Please see page #14 of the data sheet. Where you see the chipped area is pin #1.
That is, the ic is soldered upside down so from the shared pic, pin #1 is the very bottom right of the part.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-03-2022, 07:01 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Crap. See attached for UQ2 datasheet. This is a load switch (solid state relay).
Remove the defective part and check the resistance to ground for the output rails @ pins 8 & 9 of this component.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-02-2022, 08:25 AM
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Replies: 46
Views: 1,764
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-02-2022, 06:57 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Correcting my pin #s from an earlier post:
PDB1 is a sot-23 packaged dual diode device with a common cathode. The cathodes are tied together and this is pin #1. Hence the name, common cathode.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-02-2022, 06:34 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Yes, place back the coil that was removed from PL301.
Then with the power off, check the resistance to ground again to confirm there is no short circuit.
Leave off the shorted cap.
Test the...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-02-2022, 04:46 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Very good. There are 5 capacitors on the rail going to PU301 IC, pins 2-3-4-5.
One of these capacitors is shorting the line to ground.
Visually inspect for any off color capacitor in this...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-01-2022, 08:23 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
PDB1 is a sot-23 packaged dual diode device with a common cathode. The cathodes are tied together and this is pin #1. Hence the name, common cathode.
The diode passes the voltage only in one...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
02-01-2022, 04:15 PM
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Replies: 46
Views: 1,764
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-28-2022, 10:09 AM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
No. See attached. The PULL-UP voltage is missing and this rail is linked to PU301 IC.
Specifically, it is the LDO output @ pin # 16 & 17. For this rail to ENABLE, the pin # 11 of the same IC needs...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-27-2022, 12:59 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
ACDET now is a good voltage to announce that the adapter is connected.
However, SDA and SCL should not be at 0 volts on this charger IC.
The SMBUS lines will be used by the EC to configure...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-25-2022, 04:22 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
See attached.
Can you confirm again that ACDET = 0 volts ?
This is a simple resistor based voltage divider.
Pin # 1 of PRB11 should be the same as the DC adapter voltage.
What is the...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-25-2022, 02:46 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
Posting the partial parts of the schematic.
It will be a good idea to know the voltages on each pin on the charger IC @ PUB1.
Remove the battery but attach the official charger. Then carefully...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-25-2022, 01:44 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
The resistance checks look ok and the mosfet does not appear to be shorted.
Place the meter in DC volts mode (use 30V or higher).
Carefully, check the voltage on Pin #1 of this mosfet = should...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
01-25-2022, 01:22 PM
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Replies: 46
Views: 1,764
Re: Acer - N19C2 - MB EH7LW - Sudden death
PQB3 could be defective or PQB3 may not be enabled with the proper voltage on the gate.
Every mosfet has 3 pins - SOURCE; DRAIN and GATE. Often, to allow for heavy currents through the mosfet...
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