Badcaps.net Forum
Go Back   Badcaps Forums > Search Forums
Register FAQ Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 25 of 500
Search took 0.02 seconds.
Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:53 PM
Replies: 4
Views: 98
Posted By mon2
Re: Help! Macbook A1707 turn on without image..

Can you perform the SMC reset upon power up?

Do you have a usb type C meter?

What is the voltage & current draw as shown with the type C meter?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:40 AM
Replies: 2
Views: 72
Posted By mon2
Re: acer d255 la6221p completely dead

Hi.

1) Remove the battery. Remove any other add-ons that are not required like SSD / hard drive. Power up again with only the adapter. Any improvements ?

2) With the adapter connected and in...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 10:11 PM
Replies: 12
Views: 128
Posted By mon2
Re: Macbook 820-00165-A no green, no fan

Your measurement method is correct. The resistance is fine and does not show any shorting caps on the rail.

The P5VS4RS3_EN_R signal is not correct. This logic level may be low due to various...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 09:57 PM
Replies: 12
Views: 128
Posted By mon2
Re: Macbook 820-00165-A no green, no fan

r7096 has 183K resistance. should be 200k.
R7095 has 250k. should be 348k.

Yes. While the resistors may have different readings while on the logic board, remove each resistor and measure again...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 09:54 PM
Replies: 12
Views: 128
Posted By mon2
Re: Macbook 820-00165-A no green, no fan

There are often errors in the schematics. As your PPBUS_G3H is ok, do not be concerned about PPDCIN_G3H @ 14v7. It is ok.



Yes, the voltage drop is normal. The dual diodes are not perfect...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 09:16 PM
Replies: 12
Views: 128
Posted By mon2
Re: Macbook 820-00165-A no green, no fan

Voltage reading of PPVIN_G3H_P3V42G3H ?



This rail is low. It should be 3v42. Power down and post the resistance to ground for L7095, pin #2.

Also confirm the resistance of the voltage...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 07:56 PM
Replies: 4
Views: 98
Posted By mon2
Re: Help! Macbook A1707 turn on without image..

Does the keyboard CAPS green light turn on / off?

Shine a flashlight to the display front and sides.

Can you see any graphics?

The A1707 has flexgate issues. Check the internet for more...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 07:47 PM
Replies: 6
Views: 173
Posted By mon2
Re: A1708 820-00840 Wierd!!!

By removing the fuse, you will isolate the power supply the source (U7000) and the consumer/sink (rest of the logic board).

We need to check the power supply is ok and stable without a load.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 07:38 PM
Replies: 5
Views: 122
Posted By mon2
Re: lenovo y50-70 VIN mosfets gets hot & possible short

Laptop should not be used as a micro furnace.

Remove all power.

Meter in resistance mode.

Check the resistance for each mosfet as follows:

Source and drain
Source and gate
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 07:26 PM
Replies: 12
Views: 128
Posted By mon2
Re: Macbook 820-00165-A no green, no fan

Study the power rail order chart inside the schematic. It will start with the dcin plug as '1' and continue from there.

Follow the ordering to locate a fault.

Is the adapter the original?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 04:23 PM
Replies: 31
Views: 652
Posted By mon2
Re: Asus X550LD - not turning on

Suggest to replace:

a) the charger IC

b) the 2 resistors linked to the ILIM leg

Study each part connected to the charger IC to look for any possible damage. There should not have been any...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 01:59 PM
Replies: 2
Views: 64
Posted By mon2
Re: Lenovo yoga 7i

https://forums.lenovo.com/t5/Lenovo-Yoga-Series-Notebooks/yoga-7i-upgrading-to-2280-Samsung-Pro-SSD-but-windows-not-seeing-new-drive/m-p/5102168
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 01:31 PM
Replies: 31
Views: 652
Posted By mon2
Re: Asus X550LD - not turning on

Yes, if you are comfortable with the reflow and soldering, you can power up again.

Post the voltage again for the ILIM junction (PR8820 & PR8819).

What is the voltage value?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 01:27 PM
Replies: 4
Views: 122
Posted By mon2
Re: Asus GL552VW Rev. 2.0 - USB-C Shorted

These are very common USB 2.0 current limiting load switches used by many motherboard companies. Host adapter companies on the other hand do NOT use such part to save every penny.

See attached for...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 11:39 AM
Replies: 6
Views: 173
Posted By mon2
Re: A1708 820-00840 Wierd!!!

Meant to say:

If the value is not super low then remove the fuse inline this rail.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 11:13 AM
Replies: 28
Views: 657
Posted By mon2
Re: Y580 works on battery, but not with charger

If you apply a charged battery onto the non-working board and boot into Windows, is Windows able to properly gauge the battery level ? (ie. xx %)

Respectively, you should be able to operate...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 09:37 AM
Replies: 28
Views: 657
Posted By mon2
Re: Y580 works on battery, but not with charger

Test with the battery from the other working board. Same results ?

Respectively, if you take the non-working board -> remove the battery from this case, connect this battery to the working board...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 07:59 AM
Replies: 6
Views: 122
Posted By mon2
Re: Short detection - what am I doing wrong?

Where are you measuring the 0.5 ohms to ground ? Is it for the NVIDIA GPU rail ? That may be still ok.

Also, I believe schematics are available from paid sites. The attached screen grab appears to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 06:55 AM
Replies: 6
Views: 173
Posted By mon2
Re: A1708 820-00840 Wierd!!!

Check and post the resistance to ground for PPBUS_G3H. If the value is not super then remove the fuse inline this rail.

Check if ppbus_g3h is stable again on pin #1 of the removed fuse (check the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 06:51 AM
Replies: 6
Views: 122
Posted By mon2
Re: Short detection - what am I doing wrong?

A low resistance of the cpu or gpu rails does not indicate a short circuit. These rails are typically low voltage and respectively of low resistance so they are not a fault.

Post the measured...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 08:59 PM
Replies: 4
Views: 122
Posted By mon2
Re: Asus GL552VW Rev. 2.0 - USB-C Shorted

Attached.

U4706:

https://www.mouser.com/ProductDetail/ROHM-Semiconductor/BD2243G-GTR?qs=5xbMDigme7IJokVuQMu12A==
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 06:48 PM
Replies: 4
Views: 122
Posted By mon2
Re: Asus GL552VW Rev. 2.0 - USB-C Shorted

D4701 is probably a tvs diode to protect the D+ and D- lines of the usb 2.0 signals.

The best way to confirm this is to check the schematics if available.

If not available, highlight the pads...
Forum: Schematic Requests ONLY! 11-30-2021, 05:39 PM
Replies: 2
Views: 75
Posted By mon2
Re: LA-J891P board view

I have the schematic in my paid sub. Which pin has this missing resistor? Will post the relevant part of the schematic.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 03:02 PM
Replies: 4
Views: 94
Posted By mon2
Re: help! for this "ic" JD ED G21

Can you post the details of the logic board ? Brand / model / markings on the PCB ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 01:47 PM
Replies: 0
Views: 46
Posted By mon2
Any replacement for FDMD8800 ?

Hi. Have an A1708 in for repair that is not charging.

1) Found that the battery mosfet will wake up the logic board ok and display the 'plug me in' icon to charge the box.

2) upon plugging in...
Showing results 1 to 25 of 500

 
Forum Jump


Badcaps.net Technical Forums 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 01:17 AM.
Did you find this forum helpful?