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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 04:20 PM
Replies: 7
Views: 68
Posted By mon2
Re: Acer E1-531 Motherboard LA-8331P No Display

From the '#' suffix in the label name, this is an active low signal so the signal is requesting the LCD display to remain OFF (or the signal is not used).

Do you have the parts on your logic board...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:23 PM
Replies: 7
Views: 68
Posted By mon2
Re: Acer E1-531 Motherboard LA-8331P No Display

1) voltage @ +LCDVDD with the lcd attached ? (configure to use the display for these measurements)

2) voltage @ Q28B (pin # 5)

3) voltage @ DISPOFF#

4) voltage @ EDP_HPD?

5) voltage @...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 02:18 PM
Replies: 7
Views: 68
Posted By mon2
Re: Acer E1-531 Motherboard LA-8331P No Display

hi. see schematics on this forum but unable to locate the boardview files.

Perhaps you can update the following thread with your schematic (if different than the one that is posted) & boardview...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 01:43 PM
Replies: 3
Views: 68
Posted By mon2
Re: HP 15 ac102la dead no power

So the mosfets do not appear to be shorted.

If you apply the power adapter, are you able to take voltage measurements?

Concerned about the sparks noted in your post. What caused the sparks?
...
Forum: Schematic Requests ONLY! Today, 09:48 AM
Replies: 3
Views: 56
Posted By mon2
Re: acer nitro an515-54

You can download the schematic & boardview files for the LA-H501P from here:

https://www.badcaps.net/forum/showthread.php?t=91811&highlight=LA-H501P
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:40 AM
Replies: 9
Views: 184
Posted By mon2
Re: MacBook Air 13 2015 A1466 820-00165

1) Is the CPU running cooler with the keyboard not connected? For now, leave the keyboard disconnected.

2) Voltage readings for:

(with the LCD connected)

a) SMBUS_SMC_0_S0_SDA

b)...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:56 AM
Replies: 3
Views: 68
Posted By mon2
Re: HP 15 ac102la dead no power

hi.

1) remove all power to the logic board.

2) meter in resistance mode.

3) measure & post the resistance for the following:

a) PQB1: drain (pin 5-6-7-8) & source (1-2-3)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:39 AM
Replies: 2
Views: 70
Posted By mon2
Re: Hp probook 6570b only external display

Check if the LCD display is working by applying a flashlight around the front side of the display. Can you see any graphics on the LCD display? If yes, then the backlight is an issue.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:24 AM
Replies: 9
Views: 184
Posted By mon2
Re: MacBook Air 13 2015 A1466 820-00165

So now the fan is no longer pulsing on /off ? Stays on?

Power down and attach the display. Power up. Does the fan turn on and remain on till you remove the magsafe adapter? For this test, do not...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:05 AM
Replies: 3
Views: 52
Posted By mon2
Re: dell inspiron 5050 screen turned off

1) post the voltage reading for LVDS_VDD_EN with the power adapter connected.

2) post the voltage reading for LCDVCC_EN (pin 3 of the dual diode D4901) with the power adapter connected.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 03:23 AM
Replies: 3
Views: 52
Posted By mon2
Re: dell inspiron 5050 screen turned off

Hi. Not sure why your post is in this part of the forum. It should be under laptops.

1) with a power adapter, the LVDS_VDD_EN signal remains active? What is the voltage reading with the adapter? ...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Yesterday, 07:34 PM
Replies: 3
Views: 221
Posted By mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:33 AM
Replies: 10
Views: 98
Posted By mon2
Re: Asus E406MA Richtek 66=5F, 65=5G and 5E=5E

The seller is the only one that has access to this component. They did ask if the buy is for 5pcs / 10pcs ? So I suspect that they will be ok with 5pcs. Otherwise it is more ewaste for this logic...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 02:55 AM
Replies: 10
Views: 98
Posted By mon2
Re: Asus E406MA Richtek 66=5F, 65=5G and 5E=5E

Ok. Updates...

1) 65=YM is a private part for the logic board customer.

Richtek will not share anymore details but was the reply from their office.

2) after more searching, found a stocking...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-14-2021, 06:49 AM
Replies: 6
Views: 102
Posted By mon2
Re: Lenovo Ideapad 320 Stuck at 330mA

Desolder PQ1006 and measure & post the resistance values again on this removed mosfet. Some of these readings look very low on the mosfets.

Perhaps a dead CPU ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-14-2021, 05:25 AM
Replies: 6
Views: 102
Posted By mon2
Re: Lenovo Ideapad 320 Stuck at 330mA

hi.

1) remove all power.

2) Meter in resistance mode.

Measure and post the:

a) resistance between source (1-2-3) & drain (5) of PQ1001.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-14-2021, 05:15 AM
Replies: 3
Views: 93
Posted By mon2
Re: 820-01958 chime, blank display and restart

hi.

1) do not power on as PP0V6_S3 = 1.01V is incorrect and could cause damage. This rail should be 0V6.

2) See attached. Inspect the parts in the red box. Each value should be correct to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-14-2021, 05:08 AM
Replies: 4
Views: 155
Posted By mon2
Re: 820-00840 / No boot / PP3V3_G3H Short to ground

You have a short on PP3V3_G3H somewhere on the board. With 0 ohms, appears to be a hard short where dead caps are often low resistance ohms but personally have not seen 0 ohms on a bad cap.

Remove...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-14-2021, 04:58 AM
Replies: 16
Views: 280
Posted By mon2
Re: Dell E5440 completely dead

1) unable to view the posted .brd file

2) with PR14 removed, what is the voltage on GATE (pin #4) of PQ4 ?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 08:22 PM
Replies: 4
Views: 155
Posted By mon2
Re: 820-00840 / No boot / PP3V3_G3H Short to ground

Remove R3000 & R3001 - one at a time to see if the PP3V3_G3H short is removed.



I think you mean PP3V3_G3H_UPC_XA and XB.

Perhaps one or both of the ACE (U3100 / U3200) controllers got...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 08:05 PM
Replies: 9
Views: 184
Posted By mon2
Re: MacBook Air 13 2015 A1466 820-00165

hi.

1) the hard drive on this model is solid state so you are referencing the SSD stick ? It may be warm but cannot see it being hot. Do you no longer see the display working with the usual boot...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 12:16 PM
Replies: 11
Views: 451
Posted By mon2
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

Good to hear that you are making some progress.

Is the battery a known good battery? Most of the time, the battery is the fault.

If you are confident that the same battery is able to charge on...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 06:56 AM
Replies: 16
Views: 280
Posted By mon2
Re: Dell E5440 completely dead

1) voltage @ PQ4 1-2-3 ?

2) voltage @ PQ4 (pin 4 = gate) ?

3) voltage @ PQ4 (pins 5-6-7-8) ?

4) Remove all power. Meter in resistance mode.

a) resistance between 1-2-3 (source) & pin 4...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 06:49 AM
Replies: 3
Views: 86
Posted By mon2
Re: Acer laptop not detecting the harddrive

hi.

1) what are the full markings on the eMMC part ?

2) are the parts marked in yellow (attached) missing or are not stuffed ?

3) what is the history of this unit? liquid damage? dropped?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-12-2021, 07:42 PM
Replies: 26
Views: 513
Posted By mon2
Re: macbook a2141 board 820-1700 no turn on

voltage reading @

1) PPDCIN_G3H ?

2) PPDCIN_XA_G3H_F ?

3) PPDCIN_XB_G3H_F ?

4) P3V3G3S_EN ?
Showing results 1 to 25 of 500

 
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