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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:57 PM
Replies: 18
Views: 2,441
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 Today, 03:43 PM
Replies: 18
Views: 2,441
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 Today, 03:28 PM
Replies: 18
Views: 2,441
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.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:12 PM
Replies: 18
Views: 2,441
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Good ENABLE voltage for U7501 yet the output is still not valid.

Confirm the voltage @ L7560, pin # 2 (PP3V3_S5_REG_R).

If this voltage is not ~3v3, check for a short on this rail as follows:
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:57 PM
Replies: 18
Views: 2,441
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

See attached.

Confirm the voltage of EN2 (P3V3S5_EN_R) pin # 21 on U7501.

Clean up the area with alcohol to see if this improves the readings.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:29 PM
Replies: 18
Views: 2,441
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Ok. Good. So you do not have a short on this rail.

See attached. Confirm the voltage values of points 1, 2 and 3.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 12:04 PM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

No. The comment is only to offer closure to the missing part that is for the fuse. In this design, the USB connector is protected on the VBUS pin (supplies power to anything connected) through:

a)...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 11:08 AM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

Ok - so it is a no care. The IC right above it is the current limit USB load switch.

That is, EITHER the fuse OR the IC @ U5206 is stuffed but NOT BOTH. We do a similar PCB layout in our product...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 11:06 AM
Replies: 2
Views: 45
Posted By mon2
Re: Hp 840 g1 6050a2560201-mb-a03

Start with sheet 5 of the schematic = charger IC @ U6000.

Review the DCIN mosfets @ Q6010 & Q6011. Often the 2nd mosfet gets damaged.

Confirm the voltages on each of these mosfets (source ;...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 11:00 AM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

The referenced area is linked to the power rails of the CPU. As these are very low voltage rails and sensitive to the logic board, we will avoid this area for now.

For the earlier question - the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:07 AM
Replies: 2
Views: 33
Posted By mon2
Re: Lenovo ThinkPad L13 18834-1M strange fault

See attached.

Remove all power. No adapter and no battery.

Meter in resistance mode.

Check and post the resistance of the following:

Source (1-2-3) and drain (5-6-7-8)
Source and gate (4)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 08:47 AM
Replies: 21
Views: 457
Posted By mon2
Re: LA-C501P No ACDRV??

See attached. It is the same flow. Check the voltages at each of the arrow points.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:36 AM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

Correct.

Most of the power regulators are buck style (they accept a higher input voltage and supply a lower output voltage). So your logic board starts with ~19v and drills down the voltage at...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:31 AM
Replies: 21
Views: 457
Posted By mon2
Re: LA-C501P No ACDRV??

From the voltage on pin # 20 (VCC), the charger IC @ PUB01 is not being powered.

See attached.

Review the parts that have been highlighted.

The dual diode and series resistor must be present...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:27 AM
Replies: 20
Views: 198
Posted By mon2
Re: MacBook Air 2018 A1932 820-01521 Not turning on.

Good voltage.

Attempt the following:

Revive T2 firmware via Apple Configurator 2

Reference:

https://repair.wiki/w/A1932_2018_-_2019_MacBook_Air
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:24 AM
Replies: 22
Views: 755
Posted By mon2
Re: Asus FX504 not charging battery

The battery is defective as this pin should not be 0 ohms when connected to the logic board.

This P_CLK pin is a signal that is used for communication with the logic board to share the battery...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 04:18 AM
Replies: 22
Views: 755
Posted By mon2
Re: Asus FX504 not charging battery

Remove all power. Meter in resistance mode.

Remove the battery.

Measure the resistance to ground of:

P_CLK

On the battery connector.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:04 AM
Replies: 20
Views: 198
Posted By mon2
Re: MacBook Air 2018 A1932 820-01521 Not turning on.

Measure the voltage of:

PP3v3_UPC_XA_LDO
PP3v3_UPC_XB_LDO
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 01:20 AM
Replies: 11
Views: 1,351
Posted By mon2
Re: MacBook Air 2011 13" >820-3023 A< no power (PLT_RESET_L missing)

https://www.badcaps.net/forum/showthread.php?t=80705&highlight=820-3023-A
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 01:11 AM
Replies: 20
Views: 198
Posted By mon2
Re: MacBook Air 2018 A1932 820-01521 Not turning on.

Good. Now this is the expected voltage. One of the removed caps must have been bad.

What is the voltage now of ppbus_g3h ?

Check voltage of PPDCIN_G3H on each of the ports (cd3215).
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:11 PM
Replies: 7
Views: 70
Posted By mon2
Re: Macbook pro 15" 2018. keyboard backlight not working

Can you see the graphics if you use a flashlight / torch along the front face of the display?

Keyboard caps key light toggles on / off after boot?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:07 PM
Replies: 20
Views: 198
Posted By mon2
Re: MacBook Air 2018 A1932 820-01521 Not turning on.

The last measurement is considered to be too low.

Is the meter being used accurate?

From repair wiki...

The most common reason for PP3v3_G3H_RTC to be missing or low, is a short to ground,...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:44 PM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

My bad...missed the post with the resistance readings. The coil resistance readings are low but they look to be ok for the low voltage rails which are likely for the CPU (~1 volt rails).
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:17 PM
Replies: 21
Views: 277
Posted By mon2
Re: Asus UX330UA won't power on

No, very likely not shorts but rather low resistance values for each. This is common to cpu core voltage rails. Low voltage rails will have low resistance values. Your referenced coils are close to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:14 PM
Replies: 20
Views: 198
Posted By mon2
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