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Search took 0.02 seconds. Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:02 AM
Replies: 3
Views: 26
Posted By mon2
Re: asus x550l wont react to power button

..but resistance checks are to be performed always with the power OFF and with NO battery.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:57 AM
Replies: 3
Views: 26
Posted By mon2
Re: asus x550l wont react to power button

Which board is yours ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:19 AM
Replies: 1
Views: 17
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:25 AM
Replies: 3
Views: 90
Posted By mon2
Re: Macbook air A1466 Shutting Down while installing Macos

Post a pic or full details of the exact error you see during the failed installation.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 01:03 PM
Replies: 16
Views: 250
Posted By mon2
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:
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 12:50 PM
Replies: 46
Views: 648
Posted By mon2
Re: MacBook Pro Mid 2012 turns on, fans spin for five seconds and turns off, repeats

Hi. See attached.

Remove all power. Meter in resistance mode.

Use the lowest scale on your meter.

Confirm the resistance from the topside of R7020 current sense resistor to the current sense...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:12 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

Voltage for the following:

PQ8810, pin # 2

PQ8810, pin # 6

PSL8801, pin # 1

PSL8801, pin # 2
Forum: Schematic Requests ONLY! Yesterday, 08:52 AM
Replies: 0
Views: 29
Posted By mon2
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.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:49 AM
Replies: 44
Views: 430
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:33 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

What is the part # on the boardview for your charging light ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:57 AM
Replies: 1
Views: 55
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:50 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

This laptop turns on upon plugging in the AC Adapter? Without using the on/off button?

This is not normal.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 09:31 PM
Replies: 5
Views: 49
Posted By mon2
Re: Dell Precision M6600 Not Charging Battery and Reduced CPU Speed

Hi.

1) Review the schematic - page # 63/82 - charger circuit.

2) Meter in DC volts mode (20 volt scale is ok or higher) - what are the voltage readings for the following ?

< attach the power...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 11:05 AM
Replies: 5
Views: 119
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Post the voltage readings of each battery pin (with the battery connected).
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 10:49 AM
Replies: 5
Views: 119
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Post the 820-xxxx logic board #.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 10:47 AM
Replies: 2
Views: 102
Posted By mon2
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'...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 10:12 AM
Replies: 44
Views: 430
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 09:20 AM
Replies: 44
Views: 430
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 08:40 AM
Replies: 3
Views: 58
Posted By mon2
Re: HP spectre x360 possible missing components near bios chip

Ok. Are the pads with the missing parts - shorted to each other ? Sometimes, PCB designers will apply pads but not use them and they just short them across the pads.

Confirm this. If not, these...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 08:37 AM
Replies: 44
Views: 430
Posted By mon2
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...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 08:08 AM
Replies: 3
Views: 58
Posted By mon2
Re: HP spectre x360 possible missing components near bios chip

While waiting, consider to remove all power -> meter in resistance mode.

Check the resistance from each pad of concern and trace it to the BIOS chip pins.

Create a small schematic / block...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 07:41 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

If you remove the AC power adapter -> attach the battery -> does the unit power up ok with only the battery ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 07:31 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

What does Windows report if the battery is not connected ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 07:17 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

There are many suppliers of this part on Aliexpress:
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 07-03-2022, 06:52 AM
Replies: 44
Views: 430
Posted By mon2
Re: Asus tp550ld randomly shutdown

Replace the charger IC and test again.

You will have to protect the nearby smd parts so that they do not fly away.
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