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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:04 AM
Replies: 18
Views: 162
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: 1,340
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: 18
Views: 162
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: 6
Views: 39
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: 18
Views: 162
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: 11
Views: 164
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: 11
Views: 164
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: 18
Views: 162
Posted By mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:38 PM
Replies: 4
Views: 2,345
Posted By mon2
Re: Apple MacBook Air 820-00165 no PPVCC S0 CPU

Remove all power. Meter in resistance mode.

Measure the resistance to ground of PP3V3_S0.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 12:56 PM
Replies: 4
Views: 85
Posted By mon2
Re: Acer acepire 5733 not power

With this voltage on the gate, what is the drain pin voltage of pq52? (Pins 5-6-7-8)

Remove the npn transistor on the left and see if the voltage is still 18v on gate.

If yes, only the 200k...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 12:49 PM
Replies: 3
Views: 59
Posted By mon2
Re: GTX 1070 Last Set of PCIe Caps Open Line

It is possible that the x16 lane slot is designed to support only x16 lane adapters. We have seen this where our x1 lane PCIe adapters would not get detected in the x16 lane slot. The vendor, Lenovo...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:54 AM
Replies: 18
Views: 162
Posted By mon2
Re: MacBook Air 2018 A1932 820-01521 Not turning on.

Your ppbus_g3h rail is low. SMC has not yet boosted it.

Can you attach the battery to see if it helps?

Check the I2C lines on the isl device for the ppbus_g3h rail. Check the voltage of SCL and...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:49 AM
Replies: 11
Views: 164
Posted By mon2
Re: Asus UX330UA won't power on

No. Likely the missing part is a capacitor.

You are observing 0v on one leg because it is a ground pin. It is not a fuse.

Confirm it by removing all power. Resistance mode on your meter.
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:51 AM
Replies: 92
Views: 1,258
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Search for each of the signal (net) names in the attached chart.

Measure their values and post them here. If the voltage is ~3v = '1'; then this is a good reading.

If the voltage is low = '0'...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:54 AM
Replies: 92
Views: 1,258
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Good.

See attached. Check each of the signals from this chart to confirm which one is still at '0' logic level.

When each is '1' -> the board should boot = S0 power state.
Forum: General Electronics Technical Discussion Yesterday, 08:48 AM
Replies: 1
Views: 68
Posted By mon2
Re: Converting +/- 5v to a Usable Hz Signal

Review perhaps this:

https://www.amazon.ca/Voltage-Converter-Analog-0-100-2KHZ-20KHZ/dp/B07V3VHGXC
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:41 AM
Replies: 92
Views: 1,258
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Correction: R1240 - good voltage.

Confirm the voltage again of PM_SLP_S4_L
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:31 AM
Replies: 4
Views: 85
Posted By mon2
Re: Acer acepire 5733 not power

1) What is the voltage @ pin # 4 = GATE of each of these front side mosfets ?

2) Confirm that the PR354 is present on the logic board = ~200k.

3) If PR354 is present, then try to jumper a wire...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:18 AM
Replies: 92
Views: 1,258
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Measure the voltage of PM_BATLOW_L .

Check it @ Q3000 - pin # 3.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:51 AM
Replies: 92
Views: 1,258
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Attach a usb mouse. Allow the board to power up and wait a minute or so. Does the usb mouse light up?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:35 AM
Replies: 5
Views: 88
Posted By mon2
Re: Thinkpad x230 dead. Thinkengine IC issue?

If available, replace the high side 432k resistor with a lower value that is close to this value. The idea is to present a higher than 2v44 at this ACDET voltage pin. But the voltage cannot be too...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:29 AM
Replies: 25
Views: 502
Posted By mon2
Re: Acer Spin 5 - Turns on and off after a few seconds

What area were you feeling around on the board? Perhaps a dry solder joint? Try that again to see if some area needs to be reflowed.
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 07:26 AM
Replies: 3
Views: 59
Posted By mon2
Re: GTX 1070 Last Set of PCIe Caps Open Line

PCIe caps are often 0.1uf 0402 in size. Voltage of 16v or higher is fine. Just replace them if they are defective.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 06:13 AM
Replies: 4
Views: 69
Posted By mon2
Re: Alienware 15 R3 Motherboard Issues Help Plz!

Remove all power. Meter in resistance mode.

Measure the resistance across the 2 pins of these dented capacitors. Post their readings and the scale used on your meter.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 05:52 AM
Replies: 5
Views: 88
Posted By mon2
Re: Thinkpad x230 dead. Thinkengine IC issue?

Agreed.

I think the voltage at ACDET is also a suspect.

The 2v44 is too close to the required threshold value of being > 2v4.

Power down and check the resistance of the voltage divider...
Showing results 1 to 25 of 500

 
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