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Search: Posts Made By: mon2
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 05:45 PM
Replies: 100
Views: 1,409
Posted By mon2
Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

If ALL_SYS_PWRGD = 0 volts then some power rail is not ok and is pulling down this signal line.

When in this state, measure the voltage at each grey coil and post the list of which rail is not...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:53 AM
Replies: 2
Views: 38
Posted By mon2
Re: Board layers confusion (Macbook Pro)

What is the resistance to ground of this via?

The ic to the left in the pic may need a reflow with flux as it may be causing the shorting fault. These are tiny WLCSP packages with high density...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 09:49 AM
Replies: 3
Views: 80
Posted By mon2
Re: panasonic no power on fz-m1d

Review the voltages to ground at each coil which are often large and grey in color.

Each coil is linked to a local power supply but it all starts from your ac adapter at ~19v. Search the adapter...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 07:45 AM
Replies: 2
Views: 53
Posted By mon2
Re: Macbook a1398 2015 Wont go into recovery

Is the unit stable without the disk?

Yes, the missing boot media graphic will appear but that is normal. Do you get the reboot loop after this graphic?

If not, the issue is with the contents of...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Today, 06:46 AM
Replies: 8
Views: 98
Posted By mon2
Re: where to find a good supplier for smd parts

We purchased the same tool when we thought we had a bad batch of battery packs.

Post the details on how you are using this tool to conclude if the pack is defective or of quality or not.

For...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:53 PM
Replies: 18
Views: 318
Posted By mon2
Re: Alienware 15 R3 Motherboard Issues Help Plz!

Yes. This is the charger chip.

With the power adapter and battery connected, very very carefully, measure the voltage on each pin of this IC.

From the voltage readings, we will have a better...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 11:58 AM
Replies: 2
Views: 124
Posted By mon2
Re: MacBook Pro A1990 No power

Remove all power. Meter in resistance mode.

Check the resistance to ground of PPBUS_G3H. A low resistance means someone is pulling this line down.

Is this rail pulsing normal to low to normal...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:56 AM
Replies: 8
Views: 98
Posted By mon2
Re: where to find a good supplier for smd parts

Try this store - the ratings and sales volume are high. It is faster to source from Amazon if the vendor has stock closer to you but sometimes, even the Amazon vendor is in China or elsewhere.
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:48 AM
Replies: 11
Views: 187
Posted By mon2
Re: Lenovo ThinkPad L13 18834-1M strange fault

Review the details of PU401 = charger IC.

Where exactly are you measuring your battery voltage flow ?

Use only the names / labels from the schematic otherwise it is impossible to guess and...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 10:09 AM
Replies: 30
Views: 422
Posted By mon2
Re: IC Marking Codes and Datasheets #2

Post more details of other markings from your logic board.

What brand ? Model ? You will have other silk screens on the board. Perhaps a schematic is floating for your unit.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:57 AM
Replies: 8
Views: 108
Posted By mon2
Re: Bypass Sony SVE151E11M thermal protection? (schematics provided)

Wish to mention that the SHDN# pin is shared across the logic board.

From your reading of ~5 volts means that no one camped on this common signal line is requesting for a shut down.

The fault...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:53 AM
Replies: 8
Views: 98
Posted By mon2
Re: where to find a good supplier for smd parts

Aliexpress is great for the parts / LCD, etc. While we have had good luck with battery sourcing as well, shipping laws may delay or restrict the importing of batteries to your region (fire hazard)....
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:48 AM
Replies: 9
Views: 167
Posted By mon2
Re: Macbook 820-2849 c7404 - Capacitor Replacement

Good that the logic board is booting. Battery charging is another case.

Proceed carefully to review the charging issue.

See attached.

Measure and post the voltage reading of the battery...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:15 AM
Replies: 8
Views: 108
Posted By mon2
Re: Bypass Sony SVE151E11M thermal protection? (schematics provided)

The thermal sensor @ G717 needs to be powered. The power rail pin is Vcc.

This sensor can be powered by either 3v3 OR 5v0 - the decision is made by which 0 ohm resistor is assembled on the PCB. 0...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 09:08 AM
Replies: 2
Views: 55
Posted By mon2
Re: Dell Lattitude E7440 Run Slow

Watch this video - see if it helps.

https://youtu.be/00xRSqyGnks
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:38 AM
Replies: 37
Views: 1,022
Posted By mon2
Re: Asus FX504 not charging battery

Have you replaced mosfet PQ22 yet ? If not, do so.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:32 AM
Replies: 2
Views: 79
Posted By mon2
Re: Mbp a1990 emc 3215 820-01041-a

Why is the CPU very hot ? (other than it is a pig of a silicon design)

Do you have the proper heatsink and thermal compound onboard ? Be sure that the heatsink is firmly attached onto the top...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 08:24 AM
Replies: 8
Views: 108
Posted By mon2
Re: Bypass Sony SVE151E11M thermal protection? (schematics provided)

The label SHDN# has a the '#' as a suffix which denotes this signal to be active_low. That is, when this line is LOW, the shutdown event will occur.

If you are observing a logic high (5v in your...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:39 AM
Replies: 11
Views: 174
Posted By mon2
Re: Macbook A1932 Intermittent Backlight Issue 820-01521

See attached.

Check your trackpad. Remove it for testing. See if that allows for your display to function.

Check the voltage of IPD_LID_OPEN.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:35 AM
Replies: 11
Views: 187
Posted By mon2
Re: Lenovo ThinkPad L13 18834-1M strange fault

That is a short. Connect the 2 meter probes together when in resistance mode and you should see probably the same value.

What voltage do you see @ F4201 (fuse) - check both sides with the power...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices Yesterday, 07:17 AM
Replies: 8
Views: 108
Posted By mon2
Re: Bypass Sony SVE151E11M thermal protection? (schematics provided)

What is the voltage of SHDN# when logic board is on?

This line, when logic low, will force a shutdown of the board.

Test it. Apply a ground pin to the same line and board should shut down.
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2022, 05:59 PM
Replies: 3
Views: 81
Posted By mon2
Re: A1502 Trackpad not working

Try a fresh keyboard and confirm diagnostics does not raise any errors.

Reference:
https://boards.rossmanngroup.com/threads/solved-820-3536-no-trackpad-or-mouse.23580/
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2022, 05:49 PM
Replies: 1
Views: 66
Posted By mon2
Re: [Help] Dell Inspiron 15 ac adapter wattage no determined

Post or link the schematic if on this forum. Outside links are not allowed.

Dell uses an adapter_id pin that functions with a single wire interface (Maxim / Dallas semiconductor) to offer the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-11-2022, 05:43 PM
Replies: 11
Views: 187
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 08-11-2022, 02:18 PM
Replies: 3
Views: 81
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...
Showing results 1 to 25 of 500

 
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