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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:43 PM
Replies: 5
Views: 89
Posted By mon2
Re: Lenovo ThinkPad L13 18834-1M strange fault

Can you confirm the meter scale? The readings are higher than the meter scale as posted.

The ~100k ohms reading is considered low for the mosfet world.

Remove the 2nd mosfet (q4202) and see if...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:18 PM
Replies: 2
Views: 19
Posted By mon2
Re: A1502 Trackpad not working

See attached.

1) Review the interconnect cable for the trackpad.

2) review the pin pitch (spacing between each such pad) on the trackpad cable.

Be 100% sure if you are replacing this cable...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 12:14 PM
Replies: 4
Views: 40
Posted By mon2
Re: Lenovo Ideapad 510s-14isk won't boot

Remove the RAM and try again. Do you hear any POST beep code or see any different results now that the RAM is removed ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 12:02 PM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

BATPRES# will be ok with 0v but see attached.

Locate the small mosfet on BAT_PRS# line.

Do you have this circuit stuffed on your logic board ?

WITHOUT the battery, the mosfet (PQ88) should...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:56 AM
Replies: 5
Views: 69
Posted By mon2
Re: Macbook A2337 820-02016 Backlight Issue

Locate RR203 and review the voltage of this signal, RR203 (pin # 2) IPD_LID_OPEN_1V8.

What is the voltage with the LID OPEN ? with LID CLOSED ?

I believe that the LID sensors are commonly in...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:11 AM
Replies: 13
Views: 209
Posted By mon2
Re: Alienware 15 R3 Motherboard Issues Help Plz!

Locate the charger IC on the logic board.

Post the smd markings. Likely a part from TI (not the rapper) with BQ....

It should be near the dc adapter connector.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:41 AM
Replies: 3
Views: 79
Posted By mon2
Re: Apple iPad 10.2 (2019) - no power

Install iTunes on Windows.

Then connect and see if iTunes can detect this iPad.

Test with other cables. Inspect the lightning connector for damage / debris.

It is common to have this dock...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:11 AM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

PQ26 mosfet resistance looks low.

What is the voltage of BATPRES# pin 15 ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:41 AM
Replies: 96
Views: 1,345
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Will have to start from the beginning.

Check PPBUS_G3H.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:44 AM
Replies: 7
Views: 153
Posted By mon2
Re: Acer ES1-571 Winstron no display

Remove the memory stick and check if the logic board offers a POST beep or LED blink code due to the missing RAM.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:41 AM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

Ok. When you are back at it...

1) check the voltages on ILIM (pin # 21) and ACDET (pin # 6) with the battery and charger attached. Still leave the battery mosfet (PQ23) off the logic board.

2)...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:04 AM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

If you leave this battery mosfet off the board and continue to leave in the 'charge mode' with the power adapter, does the battery pack actually charge ?

Allow it to remain in this state for...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:01 AM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

That is an improvement over the 0v for past P_CLK value.

Remove PQ23 (battery mosfet) and test again.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:47 AM
Replies: 34
Views: 905
Posted By mon2
Re: Asus FX504 not charging battery

What is the voltage of P_CLK with the new battery ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 12:26 AM
Replies: 6
Views: 96
Posted By mon2
Re: Asus X455L Short Mosfet

Remove all power. Meter in resistance mode.

What are the resistance readings of these parts to ground?

Carefully remove each but do not lose the parts. Use low air pressure so other parts are...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2022, 09:21 PM
Replies: 6
Views: 96
Posted By mon2
Re: Asus X455L Short Mosfet

Remove all power -> meter in resistance mode.

Check the resistance to ground of your 2 x DCin mosfets.

These are PQ8801 & PQ8802.

Review the resistance between:

source (1-2-3) & drain...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2022, 06:58 AM
Replies: 7
Views: 130
Posted By mon2
Re: Macbook 820-2849 c7404 - Capacitor Replacement

See attached.

1) In my opinion, if you remove this cap and use as-is without this part, the logic board will function fine. There are many caps on this rail so the lack of 62uf (or similar) will...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2022, 06:13 AM
Replies: 7
Views: 130
Posted By mon2
Re: Macbook 820-2849 c7404 - Capacitor Replacement

Yes. Just be sure the voltage of the capacitor is equal or higher than the original.
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-09-2022, 05:45 AM
Replies: 3
Views: 237
Posted By mon2
Re: Advantech DAC-BC05 Power problem

My suspicion will be with the RAM.
Forum: Schematic Requests ONLY! 08-09-2022, 04:57 AM
Replies: 4
Views: 80
Posted By mon2
Re: FS440FS541 NM-C111 REV 1.0 boardview?

Attached is what I am using.
Forum: Schematic Requests ONLY! 08-09-2022, 04:19 AM
Replies: 4
Views: 80
Posted By mon2
Re: FS440FS541 NM-C111 REV 1.0 boardview?

See attached. Perhaps the same as your request.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-09-2022, 03:59 AM
Replies: 3
Views: 79
Posted By mon2
Re: Apple iPad 10.2 (2019) - no power

Hi.

1) Do you have test tools ?

2) Is this model with the Apple Lightning connector or USB C connector for charging of the model ?

3) You will need to review the current draw and voltage...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-08-2022, 03:57 PM
Replies: 18
Views: 2,483
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Ok - you have at least a broken trace to this load switch.

This part (U8030) is acting like a solid state relay. When the C2 pin (EN) is logic high (~3 volts), this switch will pass the INPUT...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-08-2022, 03:43 PM
Replies: 18
Views: 2,483
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Check the voltage again for U8030. Earlier post has this at ~0 volts.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-08-2022, 03:28 PM
Replies: 18
Views: 2,483
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Confirm the voltage of PP3V3_S5 to be sure that it matches your last posted voltage. Check at multiple locations on the logic board.
Showing results 1 to 25 of 500

 
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