Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Today, 06:19 AM
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Replies: 1
Views: 17
Re: HP Pavilion TouchSmart 14 SleekBook
See attached. Is this the ON / OFF pushbutton ?
Which pins are shorted to each other ?
Such pushbuttons are common with 4 pins.
One side will have 2 pins shorted to each other. Then the...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 01:03 PM
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Replies: 16
Views: 250
Re: Macbook Pro 2010 Not Charging
Hi. Ok, after a stare of the PCB, can see the pattern (I think).
See attached. Does this look correct on the wiring ?
TOP ARROW = SDA pin.
BOTTOM ARROW = SCL pin.
My suggestion:
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Forum: Schematic Requests ONLY!
Yesterday, 08:52 AM
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Replies: 0
Views: 29
Schematic request for Asus TP550LD
Hello. If available, please post the schematic for the Asus TP550LD R2.0 but any version will be a great start. Have the BV and a blurry repair guide already for the same. Thanks.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 08:49 AM
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Replies: 44
Views: 430
Re: Asus tp550ld randomly shutdown
Need a few measurements:
1) PR8812, pin # 1 - what is the voltage ? Should be ~3 volts.
2) PR8812, pin # 2 - what is the voltage ?
3) PR8816, pin # 2 - what is the voltage ?
4) Remove all...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
Yesterday, 06:57 AM
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Replies: 1
Views: 55
Re: hp DA0U83MB6E0 REV C
You may have a problem with the external power adapter.
Often, HP / Dell adapters have an ID (identification) so that the logic board can determine if the power adapter is able to supply the...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
07-03-2022, 10:47 AM
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Replies: 2
Views: 102
Re: Lenovo Thinkpad W540 no power
Hi.
1) Remove all power -> meter in resistance mode (lowest scale) -> check the resistance to ground of VINT20. What is the reading ? Also post the meter scale.
If the meter reports '1' or 'OL'...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
07-03-2022, 10:12 AM
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Replies: 44
Views: 430
Re: Asus tp550ld randomly shutdown
These are good voltages for the battery mosfet.
The charger IC is turning ON the battery mosfet when the external power adapter is removed.
The charger IC is turning OFF the battery mosfet when...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
07-03-2022, 09:20 AM
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Replies: 44
Views: 430
Re: Asus tp550ld randomly shutdown
1) mosfet datasheets are attached.
So PQ8803 = battery FET.
When the power adapter is attached, the charger IC should turn OFF the n-channel mosfet (PQ8803) by lowering the gate voltage on...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
07-03-2022, 08:37 AM
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Replies: 44
Views: 430
Re: Asus tp550ld randomly shutdown
Need more details:
1) PQ8803 = ACFET - what are the markings on this MOSFET ?
2) which is the RBFET on your logic board ? (PQ8804 ?) - markings on mosfet?
3) which is the battery FET on your...
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