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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:35 AM
Replies: 5
Views: 92
Posted By mon2
Re: Acer Aspire ES1-431 no Power LED

Yes, appears that U8 is not enabling the respective LEDs.

As a work around, you can hard wire the BLUE led circuit by:

a) carefully removing the resistor and rotating so that one leg is towards...
Forum: Schematic Requests ONLY! Today, 07:34 AM
Replies: 1
Views: 29
Posted By mon2
Re: Schematic request for Lenovo A485 NM-B711

Sharing the boardview file.
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Today, 07:18 AM
Replies: 1
Views: 18
Posted By mon2
Re: usb flash drive "0 Bytes" - data recovery

Try this tool to see if it can see anything different:

https://www.easeus.com/storage-media-recovery/fix-usb-shows-no-media-in-disk-management-error.html
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Today, 05:53 AM
Replies: 95
Views: 10,465
Posted By mon2
Re: Apple Mac Mini A1347 Late 2014 completely dead no power

@booyabeetz, what is the history of this machine? Worked one day, dead the next?

What is the status of the diagnostic LEDs? Do you see even a single LED ON when powered?

Do you have test...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Today, 05:43 AM
Replies: 1
Views: 34
Posted By mon2
Re: Abit IC7 no POST 2nd battle

The resistance to ground of the voltage rails in your post looks to be low.

What are the topside markings of the mosfets that are heating up ?

You can check if the mosfets are defective or not...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:13 AM
Replies: 5
Views: 92
Posted By mon2
Re: Acer Aspire ES1-431 no Power LED

Remove all power. Place your meter into DIODE mode.

Place one meter probe directly onto pin #1 of the dual color led.

Place other meter probe directly onto pin #3 of the dual color led.

Can...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:59 AM
Replies: 9
Views: 100
Posted By mon2
Re: MacBook pro, 820-2610-A, X5R capacitors

Just source X5R or x7r capacitors from a real distributor and you will be fine. Some shops on AliExpress may bait and switch the caps.

The designs state the type of cap that should be used for the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:42 AM
Replies: 5
Views: 92
Posted By mon2
Re: Acer Aspire ES1-431 no Power LED

hi. You are saying that the PWR dual color LED is not defective but the BLUE / AMBER does not light up ?

The signals are linked to the IT8987 (U8) and driven by its GPIO pins.

The # suffix on...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 03:54 PM
Replies: 5
Views: 77
Posted By mon2
Re: HP Envy 17, LA-C991P, Burned components

Hi. See attached for the name of the board & schematic that has the same part onboard. We can continue to debug your board using this example since it is similar for this DCin side of the design.
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 03:00 PM
Replies: 28
Views: 343
Posted By mon2
Re: Hp 15-cs2023ca USB 2.0 not working

Yes. It only a suggestion since you have lost a block of usb ports.

From a distance, the crystal package appears to be 3225 but check with a micrometer. 3.2*2.5 mm ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 01:44 PM
Replies: 5
Views: 77
Posted By mon2
Re: HP Envy 17, LA-C991P, Burned components

See attached - found another schematic with this part.

Now - review if you see a connection from the charger IC to the mosfet like this schematic.

Then review the mosfet they have used in this...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 01:39 PM
Replies: 9
Views: 100
Posted By mon2
Re: MacBook pro, 820-2610-A, X5R capacitors

These are not critical parts with respect to the capacitance.

So you can use 1uf or higher - they are using 10v but according to the leg of the design, they are expecting to support 5v1 (see the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 01:06 PM
Replies: 5
Views: 77
Posted By mon2
Re: HP Envy 17, LA-C991P, Burned components

Locate the DC in connector -> are these mosfets near that connector ? Then locate the charger IC that should be also close to these mosfets.

What are the SMD topside markings ? Probably a 'BQ' =...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 11:44 AM
Replies: 20
Views: 366
Posted By mon2
Re: HP Compaq 6510B inventec Rev 1.0 - U28 IC GETTING HOT

If you are reading source & drain as '1' then this may be the meter stating that the meter scale is too low for a measurement.

If the meter is not auto-ranging for the resistance, switch to the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 11:30 AM
Replies: 9
Views: 2,133
Posted By mon2
Re: Lenovo Ideapad 330S-15IKB dead

Thanks @menshawy. Appreciated.

See attached. Review the highlighted mosfets and measure the voltage on each of the pins:

source (1-2-3)
gate (4)
drain (5-6-7-8)

for the 2 x DCin mosfets....
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 11:03 AM
Replies: 9
Views: 100
Posted By mon2
Re: MacBook pro, 820-2610-A, X5R capacitors

X5R defines the characteristics of the part vs. temperature. It is a stable spec to use X5R.

Better to use x7r which are rated for yet higher temperature.

What are the cap values? Where are you...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 11:00 AM
Replies: 20
Views: 366
Posted By mon2
Re: HP Compaq 6510B inventec Rev 1.0 - U28 IC GETTING HOT

Can you clarify?

The actual mosfet was removed off the board and now the new measurements are of the PCB pads or of the part that is on your table?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 10:22 AM
Replies: 13
Views: 1,166
Posted By mon2
Re: HP 9470m Change MAC ADRESS

Why can you not change the MAC ADDRESS with the utility linked earlier ?

We have done this with success for mac address locked CAD tools so that we can develop at the office or home office.
Forum: Schematic Requests ONLY! 09-23-2022, 10:13 AM
Replies: 15
Views: 2,988
Posted By mon2
Re: Please Share schematics for el5c3/el 531/el 431 la-h101p

What is on the OTHER side of this component on the logic board ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 10:08 AM
Replies: 4
Views: 557
Posted By mon2
Re: MacBook Pro 16 A2141 Battery issue

OMG.

1) Contact Apple and raise your voice on this issue. Mention that you have boatloads of their product and that you are a decision maker - they do support volume clients such as yourself -...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 09:34 AM
Replies: 28
Views: 343
Posted By mon2
Re: Hp 15-cs2023ca USB 2.0 not working

It is from the posting made here:

https://www.badcaps.net/forum/showthread.php?t=102818

which I am assuming is close to your logic board - perhaps not 100%.

Either way, it is a crystal so...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 09:10 AM
Replies: 26
Views: 340
Posted By mon2
Re: Hp 15 la-d707p not power on .

Can you confirm the following ?

1) If you remove pq203 and apply a DC power supply onto the main power rail - the logic board works fine ? You also see the ~24v on the ACDRV pin of the charger IC...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 07:45 AM
Replies: 9
Views: 2,133
Posted By mon2
Re: Lenovo Ideapad 330S-15IKB dead

As per above comments, review where the dcin connector starts. There should be mosfets near by. Then a charger IC. Often, the charger IC is from TI (not the rapper).

Take and post clear pictures...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2022, 07:42 AM
Replies: 26
Views: 340
Posted By mon2
Re: Hp 15 la-d707p not power on .

That is a very high resistance.

Can you post a picture of your meter with the scale being used for the resistance measurements?

When you short the meter probes, do you see ~0 ohms on the meter?
Forum: Schematic Requests ONLY! 09-23-2022, 06:56 AM
Replies: 2
Views: 67
Posted By mon2
Re: Asus x514j need shematİc

Could not locate a schematic for this logic board.

What is the fault? Perhaps the schematic is not required to fix your unit.
Showing results 1 to 25 of 500

 
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