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mon2 replied to Lenovo Flex not charging

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 04:25 PM
I would be concerned with the mv step resolution as shown in the following comparison chart:

[url]https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1038973/bq25700a-replace-a-bq25703-with-a-bq25700[/url]

[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3622561}[/ATTACH]https://I would be concerned with th...-bq25700[/url]...

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mon2 replied to Macbook A1707 820-00928 battery replacement

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 04:09 PM
Confirm the voltage to ground on:

[B]C7075
C7077
TBA_AUX_DET
PP3V3_G3H
PPVIN_G3H_P3V3G3H[/B]

Remove all power. Meter in RESISTANCE mode. Measure the resistance across [B]C7023[/B]. What is the resistance in ohms?

Repeat to test the resistance across [B]C7020[/B]. What is the resistance in ohms?Confirm the voltage to ground on:

[B]C7075
C7077
TBA_AUX_DET
PP3V3_G3H
PPVIN_G3H_P3V3G3H[/B]

Remove all power. Meter in RESISTANCE mode. Measure the resistance across [B]C7023[/B]. What is the

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mon2 replied to Lenovo Yoga 7i blown USB port issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 04:01 PM
Yup. It needs to be replaced.

[url]https://www.fortuneadvanced.com/products-detail/FA3210-i.13[/url]

[url]https://www.aliexpress.com/w/wholesale-FA3210.html?spm=a2g0o.home.search.0[/url]https://Yup. It needs to be replaced...search.0[/url]Yup. It needs to be replaced.

[url]https://www.fortuneadvanced.com/products-detail/FA3210-i.13[/url]

[url]https://www.aliexpress.com/w/wholesale-FA32

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mon2 replied to Dell Latitude 5320 USB-C port issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 12:49 PM
TBH the original part vendor is crap. Most of these switches do die under such transients but my money would be on a TI or Diodes Inc. or Microchip part before a China only vendor.

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mon2 replied to Dell Latitude 5320 USB-C port issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 12:17 PM
TY for the correction.

Pin # 1 is much healthier now after this part was removed. This USB load switch is defective. Needs to be replaced. Study the pinout and compare to other drop in parts from Texas Instruments / Diodes Inc. / Microchip, etc. There are many similar vendors that can drop into this same space. This is a current limited load switch and they just die after a transient. Wimpy by design. You can define the peak current support by the part you will purchase.

Before ordering, share the full details on what you intend to purchase.

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mon2 replied to Dell Latitude 5320 USB-C port issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 10:33 AM
Suspecting this to be a SOT23-5 packaged TVS ESD diode array. Flux and carefully remove the part and test the PCB pads again (without his part on the board).

Also, when you are in DIODE mode, these are voltage readings.

When you in RESISTANCE mode, they will be in ohms.

When in DIODE mode, be sure the RED meter probe is to ground. Black meter probe on the pin to test.

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mon2 replied to la-j081p charging issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 07:21 AM
Good. Suggest to use the values as defined by the schematic otherwise the excessive current draw from the battery pack will not be sensed properly. The charger IC is expecting to have onboard the values showing in the schematic.

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mon2 replied to Acer TMX314-51 laptop battery problem

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 06:24 AM
Way too low for a good mosfet. Flux and remove this mosfet and test if the mosfet still has the same values. Each measurement must be hundreds of K ohms or higher. Otherwise, replace this mosfet....

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mon2 replied to la-j081p charging issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Today, 06:22 AM
Have you tested another known good battery on this laptop?

Remove all power. Meter in resistance mode. Measure the resistance between pins #1 and #2 on the charger IC @ [B]PUB01[/B]. Test directly on the IC pins with the meter probes. Checking if the full path resistance matches the schematic value. If they do not, the charger IC believes there is a fault in the battery pack and powers down. The battery may be just depleted but the adapter is not charging the battery.

What is the resistance in ohms?Have you tested another known good battery on this laptop?

...

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mon2 replied to Macbook A1707 820-00928 battery replacement

in Troubleshooting Laptops, Tablets, and Mobile Devices

Yesterday, 05:14 PM
Remove the fuse at F7000. Test again if this power rail is restored. If not, fault is in the isl9239 area. Confirm the power rails you can measure that power this buck boost regulator. Confirm the input and output current sense loops are matching the schematic resistor values.

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mon2 replied to Lenovo Yoga 7i blown USB port issue

in Troubleshooting Laptops, Tablets, and Mobile Devices

Yesterday, 03:32 PM
Share pics of the parts on the cable. You should see a 5 or 6 legged part in a SOT23-5 or SOT23-6 package. This is a USB load switch. Suspecting this part to be defective and raising the excessive current trip. Another possibility is a similar looking packaged part that is a USB TVS ESD array. Once they trip, same fault will be raised.

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mon2 replied to Hp pavillion x360 15-CR0087CL BOARD: LEIA_15 KBL UMA 17881-1B missing component

in Troubleshooting Laptops, Tablets, and Mobile Devices

Yesterday, 01:42 PM
Very good repair. The part indeed will be a SOT23-6 packaged ESD TVS diode array with a rating of 3v3 to 5v max. The focus of this part is to prevent transients on the SMBUS lines. If this part was originally shorted then it appears to have done the job.

From where do you purchase your parts? Digikey? Mouser?

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mon2 replied to MacBook A1990 — No Display With Battery Connected

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 08:22 AM
Run ASD for a deeper dive.

[url]https://boards.rossmanngroup.com/threads/pfm006-code-from-apple-diagnostics.12917/[/url]https://Run ASD for a deeper dive.<b...s.12917/[/url]

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mon2 replied to Alienware 17 R4 LA-D751P - Battery Not Charging

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 07:37 AM
Excellent!

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mon2 replied to HP 17-cn0152ng part U201 Q300 broken

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 07:36 AM
Here are some suggestions:

1) Confirm if the large cable @ CN200 are linked to the keyboard.
2) Locate the replacement keyboard on the internet. Often, the same replacement part will be compatible with other models from the same vendor, HP.
3) Then hunt for the alternate HP models for which there may be schematics available. That is, we can learn from the available schematics on the pinout for this same keyboard cable (assuming it is a keyboard).
4) Then using a multimeter, you can trace this SOT23-5 device and hunt as to where it travels onto this connector. To...

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mon2 replied to MacBook A1990 — No Display With Battery Connected

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 07:31 AM
Backlight fault?

Test with a torch / flashlight to the front face of the display. Display is defective? Was the unit dropped? Post pics.

Does the caps lock led toggle ok?

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mon2 replied to HP 17-cn0152ng part U201 Q300 broken

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 06:32 AM
What are silk screened markings on the board?

The large connector @ CN200 is likely keyboard?

The burnt part may be a USB loadswitch in a SOT23-5 package. Share more pics of the board.

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mon2 replied to Omen laptop DA0G3EMBCD0, shor circuit from USB

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 06:27 AM
Review the bottom side of the 51486 chip - appears that one pin (at least) is missing. There should be 5 contacts on the bottom side that appears to be 'burnt' looking.

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mon2 replied to MacBook A1990 — No Display With Battery Connected

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-22-2025, 06:23 AM
Test with an external monitor. The SMBUS voltages are fine - they are not shorted.

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mon2 replied to Lenovo Ideapad 1 runs at only 400 mhz LA-L502P

in Troubleshooting Laptops, Tablets, and Mobile Devices

04-21-2025, 07:25 PM
That is a logic '0' = Low and this signal is active LOW. This means that the processor is deemed to be 'too hot' so this signal is being pulled down to the logic low level to alert everyone on the board. Respectively, this includes to slow down the CPU.

Review your thermal sensors.

Here is a general case study (found through a quick internet search) on this topic:

[url]https://www.reddit.com/r/overclocking/comments/ls3yqo/help_with_understanding_bd_prochot/[/url]https://That is a logic '0' = Low an...ssor is deemed

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