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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:04 PM
Replies: 11
Views: 188
Posted By mon2
Re: microSD card issue with Tab S

See here:

https://forum.xda-developers.com/t/maximum-sdcard-storage-size-sm-t800-galaxy-tab-s-10-5.2952054/
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:00 PM
Replies: 16
Views: 300
Posted By mon2
Re: Haier 7g-5h Plug in not charging, only charge when laptop power-off

Well done !!


This should be possible but guessing that the scale setting of your multimeter was too low. Since we know in advance that the resistance of PR37 should be about 100k ohms, use a...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:45 PM
Replies: 7
Views: 86
Posted By mon2
Re: no backlight asus x55ld

What is the model of your logic board ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 10:07 AM
Replies: 1
Views: 59
Posted By mon2
Re: sony mbx 266

Post the schematics (if available).

Unable to locate the MBX 266 schematics in my database.

Most likely the LCD panel is a LVDS interface. There should be a backlight pin on the display panel...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 10:00 AM
Replies: 11
Views: 188
Posted By mon2
Re: microSD card issue with Tab S

No clue. You can confirm with Samsung or review their documents.

Are you finding that the fault is with the 128 GB cards ?

See attached. This is from the Samsung website. Do you have one of...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:56 AM
Replies: 7
Views: 86
Posted By mon2
Re: no backlight asus x55ld

What is the model of your logic board ?

See attached.

No schematics available but we may have boardview files.

Do you have a multimeter & hot air soldering tools ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:35 AM
Replies: 7
Views: 86
Posted By mon2
Re: no backlight asus x55ld

More clues will be helpful.

1) Correct model # is Asus X555LD ?

2) When on battery, does the laptop boot ? Can you see the graphics with the HDMI port & external monitor ?

Or is the fault...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:51 AM
Replies: 11
Views: 188
Posted By mon2
Re: microSD card issue with Tab S

In the past, there have been chats about fakes on Amazon, etc. for such SD cards. Be sure to test with a known good source. Great if this solution is working and remains stable.

You may want to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:48 AM
Replies: 7
Views: 86
Posted By mon2
Re: no backlight asus x55ld

No backlight on the LCD or keyboard ?

The laptop works otherwise ? Shine a flashlight (phone) on the front face of the LCD and check to see if you can see any of the usual graphics on the display...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:46 AM
Replies: 5
Views: 322
Posted By mon2
Re: Asus X540up no power and won't on

Suggest the way to attack this case is to start with the charger IC.

The charger IC is @ PU8001. See attached.

PU8001 = ONSEMI NCP81216AMNTXG

Then locate the datasheet for this component or...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:27 AM
Replies: 2
Views: 48
Posted By mon2
Re: Lenovo Yoga 3-1470 80JH Keyboard issue

From internet searches, the Yoga 3 = NM-A381 logic board ?

Found the schematic for NM-A381. The keyboard scanning is performed by the IT8386E-192 CX LQFP-128L device @ UE1.

These parts are...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:19 AM
Replies: 5
Views: 90
Posted By mon2
Re: X1 Carbon Gen3 5 beeps

The resistance values look ok and do not show any shorts to ground of the measured rails.

We do not have a lot to go on but review the charger IC which of course is in the witness protection...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:39 AM
Replies: 1
Views: 45
Posted By mon2
Re: Macbook Air A1466 Dead

So PPBUS_G3H rail is not correct.

1) Voltage of PPBUS_G3H @ R7006, pin # 1 ?

2) Voltage of PPBUS_G3H @ F7140, pin # 1 ? F7140, pin # 2 ?

3) Voltage of PPDCIN_G3H ?

Also check and post:
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 04:40 AM
Replies: 11
Views: 188
Posted By mon2
Re: microSD card issue with Tab S

According to the datasheet for this tablet, any speed of the sd card should work. Maybe the working as card is a faster speed grade and allows the tablet to boot normally.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 04:23 AM
Replies: 16
Views: 300
Posted By mon2
Re: Haier 7g-5h Plug in not charging, only charge when laptop power-off

1) good that you have +3VPCU working on pin #8 of PU9.

2) confirm again that PR37 has one side of the resistor going to pin #10 (ILIM) of the charger IC.

The other side of PR37 should be a...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:53 PM
Replies: 5
Views: 90
Posted By mon2
Re: X1 Carbon Gen3 5 beeps

Please check the resistance to ground of each coil.

Red meter lead to coil. Black meter lead to ground.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:25 PM
Replies: 5
Views: 90
Posted By mon2
Re: X1 Carbon Gen3 5 beeps

Power down. Remove the battery. Check the resistance to ground on each coil on the logic board.

Is the ram removable? If yes, remove it and boot up again.

Does the POST beep code change ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:48 PM
Replies: 4
Views: 102
Posted By mon2
Re: MacBook Air 2020 A2337 Trackpad Chip

Can you post where this component is exactly on the logic board ? Is it on the trackpad? If yes, the trackpad needs to be replaced. Check Aliexpress.

If on the logic board, zoom out a bit so the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 04:41 PM
Replies: 18
Views: 372
Posted By mon2
Re: Y580 works on battery, but not with charger

See attached.

Attach the power adapter (no battery).

Measure and post the requested values.

The Si4459 are p-channel mosfets. Therefore the GATE must be NEGATIVE voltage with respect to the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:43 AM
Replies: 16
Views: 300
Posted By mon2
Re: Haier 7g-5h Plug in not charging, only charge when laptop power-off

1) PR38 may be a no stuff on the PCB since the PR38 has a '*' prefix. Every vendor has their own kooky system on what part should be a stuff or no stuff during the PCB assembly process. For HP,...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:21 AM
Replies: 18
Views: 372
Posted By mon2
Re: Y580 works on battery, but not with charger

1) What is the voltage of PL401, pin # 1 on both logic boards ?

2) Voltage on pin #1 & #6 of PU401 while the battery is charging ? When the charger cuts the power to the battery ?

3) What...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:32 AM
Replies: 12
Views: 176
Posted By mon2
Re: acer predator 791g no power

Ok. Found the version 1.0 schematic in the database and perhaps v2.0 of the boardview file.

Does the attached look the same as yours ?

It is tied to the encrypted viewer that does not allow for...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:44 AM
Replies: 12
Views: 176
Posted By mon2
Re: acer predator 791g no power

Hi.

1) Never just inject voltage onto rails till more is known about the condition of your logic board.

2) Is your model also known as the ACER ASPIRE ?

3) PU4401 is the first mosfet that is...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:28 AM
Replies: 18
Views: 372
Posted By mon2
Re: Y580 works on battery, but not with charger

The BATT+ rail is also connected to the battery mosfet PQ303.

1) What are the voltages on PQ303 while the adapter is powering the logic & the battery is connected ?

Voltage on drain (5-6-7-8)...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:37 AM
Replies: 17
Views: 327
Posted By mon2
Re: Asus X550LD - not turning on

On the use of the repair guide, remove all power (no adapter / no battery).

Review sheets # 6 & 7 of the repair guide. These are DIODE value readings on a known good logic board.

Configure your...
Showing results 1 to 25 of 500

 
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