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Forum: Schematic Requests ONLY! Today, 10:41 AM
Replies: 5
Views: 355
Posted By mon2
Re: PC specialist NL5E-N18EG motherboard

This question is best posted in the laptop repair side of the forum.

Remove all power -> meter in resistance mode (start with the lowest scale).

Then measure across the mosfet pins as follows:...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 10:29 AM
Replies: 5
Views: 75
Posted By mon2
Re: please help toshiba c850 no display just work on external

The dude in the video is using hot air to temp fix the the video controller. If your unit has one then he is claiming that 99% of the time it is the fault.

Perhaps consider to test in the same way...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 10:27 AM
Replies: 5
Views: 43
Posted By mon2
Re: Macbook air a1932 not working with audio board connected

Very good. It should be fairly quick to locate the shorted cap - maybe there are only a few on this audio board and you can remove one at a time to locate the bad one.

Use flux to clean up the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 10:02 AM
Replies: 4
Views: 433
Posted By mon2
Re: CAP10 LA-E321P Precision 7720

It is from a paid sub that links LA-E311P as the same or similar - you can download the same schematic here:

https://www.badcaps.net/forum/showthread.php?t=100215&highlight=E311p
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:27 AM
Replies: 3
Views: 46
Posted By mon2
Re: Acer SF314-52 charging

This is ok since you do not have a battery connected so no job to do..

1) Attach the battery and the adapter. What is the voltage @ L8800, pin # 2?

2) Your battery is showing a voltage ~15.08V...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:04 AM
Replies: 2
Views: 36
Posted By mon2
Re: need bios toshiba tecra r940

Wrong thread in the forum. There is a dedicated BIOS thread up above.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:01 AM
Replies: 7
Views: 43
Posted By mon2
Re: Acer 5741 LA-5892p not power on.

Remove PD15 and then check the voltage of ACON.

What is the voltage of RTCBATT ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:46 AM
Replies: 38
Views: 945
Posted By mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:43 AM
Replies: 7
Views: 43
Posted By mon2
Re: Acer 5741 LA-5892p not power on.

Can you confirm in diode mode that the component is not defective?

Do check also 2 & 1 then reverse the meter leads, etc.

Concern is if ACON is being pulled down due to this diode.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:40 AM
Replies: 5
Views: 43
Posted By mon2
Re: Macbook air a1932 not working with audio board connected

1) 820-01521 ?

2) See attached. Remove all power. Remove the audio board and check the resistance to ground of each of the I2C lines linked to the audio circuits.

Use the lowest resistance...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:33 AM
Replies: 3
Views: 46
Posted By mon2
Re: Acer SF314-52 charging

1) is the battery pack detected ?

2) what is the voltage of +BAT_CON with the battery & adapter connected ?

3) Remove all power. Meter in DC volts scale. Measure the voltage of +BAT_CON...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:29 AM
Replies: 5
Views: 43
Posted By mon2
Re: Macbook air a1932 not working with audio board connected

What is the 820-xxxx logic board number ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:47 AM
Replies: 7
Views: 43
Posted By mon2
Re: Acer 5741 LA-5892p not power on.

What is the voltage of Pin # 1 of PD15 dual diode ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:05 AM
Replies: 7
Views: 43
Posted By mon2
Re: Acer 5741 LA-5892p not power on.

Good review so far !

There is another similar case on the thread and following the same logic flow.

What is the voltage of ACOFF ?

ACOFF is driving the base of PQ65 to turn it ON and this is...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:29 AM
Replies: 38
Views: 945
Posted By mon2
Re: B+ Voltage rail; Lenovo Y510p VIQY1 NM-A032

Post the measurements for points # 1 & # 2 of the attached.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:42 PM
Replies: 5
Views: 75
Posted By mon2
Re: please help toshiba c850 no display just work on external

Watch this:

https://youtu.be/5Tv2HnU6Ouo
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 03:14 AM
Replies: 20
Views: 275
Posted By mon2
Re: DELL latitude e7470 does not recognize dell charger

No. '702' smd markings = 2N7002 mosfet.

Need dual esd diodes in the same package.

https://trichylaptop.com/product/2n7002-mos-transistor-marking-702-smd-n-channel-fet-sot-23/
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 04:06 PM
Replies: 19
Views: 258
Posted By mon2
Re: testing an LCD macbook A1286

Something like this should work - agree that if you can salvage the unit - you should:
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 03:45 PM
Replies: 17
Views: 156
Posted By mon2
Re: Acer e1 usb not worknig

When you boot into Windows -> do you see the presence of the USB interface in the device manager tree ? This should be the very bottom of the Device Manager tree -> click the '+' to expand the view....
Forum: Schematic Requests ONLY! 05-23-2022, 03:32 PM
Replies: 1
Views: 43
Posted By mon2
Re: Need BoardViewer HP 11-2010nr (da0c1mbaaf0)

You gave us Shakira so certainly we can (try to) help.

Post the request as a new thread in the laptop repair forum.

Unable to locate a boardview file for this logic board but it may not matter....
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 03:17 PM
Replies: 15
Views: 179
Posted By mon2
Re: Asus pro p3540fa

Likely this is not a concern to test as the CPU will be a low resistance - for now you can skip this one. CPU rails are often with a low resistance.

Proceed to check the next coil. Often CPU...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 03:01 PM
Replies: 15
Views: 179
Posted By mon2
Re: Asus pro p3540fa

Ok. That is an ok reading.


At your discretion, consider to start with the top reading coil -> use your local power supply set to 0v8 (that is what we prefer to use) @ current limit 1A (for...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 02:24 PM
Replies: 15
Views: 179
Posted By mon2
Re: Asus pro p3540fa

These are suspects.



What scale and resistance is this reading ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 02:18 PM
Replies: 17
Views: 156
Posted By mon2
Re: Acer e1 usb not worknig

Still check the readings of each to ground for the USB pins.

Very lame of them to not stuff this low cost ESD protection device which most likely has caused many failures out in the field.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-23-2022, 01:58 PM
Replies: 15
Views: 179
Posted By mon2
Re: Asus pro p3540fa

Ok. Remove all power. Meter in resistance mode.

Check the resistance to ground of each coil. Some of the coils are expected to be low as they are low voltage rails for the CPU / GPU, etc.
...
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