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juergenb
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Last Activity: 04-10-2024, 11:55 PM
Joined: 01-10-2018
Location: Hessen
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  • juergenb
    started a topic Repair Sophos APX120 - 3.3V LDO Marking
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals

    Repair Sophos APX120 - 3.3V LDO Marking

    Hello, I am looking for help with the identification of an SMD LDO in SOT-26 or TSOT-26 design.

    The APX120 no longer has a 3.3V voltage.
    The LDO still seems to be working as you can still hear the switching frequency (where I can with my old ears).

    I can make out FN5FVT as a marking.
    On a second one it says FN5FST.

    Does anyone know the manufacturer of the LDO?

    Thank you​[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"APX120 U20, C510, LDO.jpg","data-...
    See more | Go to post
  • juergenb
    replied to Thinkpad E490 - dead, +1.8VALW shorted
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Thinkpad E490 - dead, +1.8VALW shorted

    "Something is wrong with the PSU setup, though. If you inject 1V/5A, the load either draws the full 5Amps with voltage drop present or it reaches 1Volts without drawing the full 5 Amps. Both at the same time is impossible."

    The DUT draws 2.4A, it looks like the current is limit somehow.
    For a Voltage of .4V the resistance must be arround 0.17 Ohms.

    Maybe my cable to the DUT is to weak.
    See more | Go to post
    Last edited by juergenb; 08-27-2023, 11:48 AM.

    Leave a comment:

  • juergenb
    replied to Thinkpad E490 - dead, +1.8VALW shorted
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Thinkpad E490 - dead, +1.8VALW shorted

    Hi,
    i have a Siglent 1305X with 30V @ 5Amps max, i had the Voltage Limit at 1V and Current Limit is at 5A.
    At the time i purchased this i wasn´t clear if i would need 30V/5A (so i would have 19V available) or i need the 16V/8A Modell...
    Maybe i need a short killer

    I soldered a cable to PJ802 and connected at several GND locations.

    PSU showed Output @ 0.4V and at 2.4A (I controlled this with a Fluke too).

    The Voltage was no more than 0.4V - 0.5V on the output so i raised the voltage...
    See more | Go to post
    Last edited by juergenb; 08-27-2023, 10:00 AM.

    Leave a comment:

  • juergenb
    started a topic Thinkpad E490 - dead, +1.8VALW shorted
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Thinkpad E490 - dead, +1.8VALW shorted

    Hi,

    i have a E490 with NM-B911 (ThinkPad E490 14" Intel i5-8265u).

    Notebook doesn´t start, Shift LED and Power LED is lit.
    SSD, HDD, Memory is fine (tested these external).

    PU801 gets extrem hot.

    Other compents getting warm (CPU i5, SSD, Memory Module)

    So i removed PJ802 Bridge.

    These Voltages of PU801 (RT9059GQW)

    +1.8VALW
    +3.0VALW
    +5.0VALW

    are fine and it stays cold.

    If i inject +1V/5A at PJ802 nothing get´s hot on the board.
    PSU Drops to 0.4V and...
    See more | Go to post
  • juergenb
    started a topic Dell Precision 3660 - BIOS Image, Hidden Settings, Thermal Settings ?
    in BIOS & Schematic Requests!

    Dell Precision 3660 - BIOS Image, Hidden Settings, Thermal Settings ?

    I got my self a new Dell Workstation (Dell Precision 3660, i5-13500).

    Unfortunately, Dell has fixed the front fan´s settings in the BIOS.
    Both the speed and the presence of the fan are fixed.

    There seems to be no hidden setting.

    The thermal tables for the speeds were changed in one of the last BIOS updates.

    Do you see a possibility to change these tables from the BIOS update file?

    Precision_3660_2.1.0 -> Release Notes

    Updated the thermal table to reduce fan noise.
    Updated Intel Management...
    See more | Go to post
  • juergenb
    replied to ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?

    After long time, i retried this Thinkpad.

    I took the board out and examined the backside, nothing obvious.
    So i powered the board and the board didn´t shutdown as usual.
    The Power LED was solid, i had picture.

    So finally i attached an HDMI monitor.

    The Board was self healing the bios and restarted a few times.
    But it has a bad CRC in security settings and i must enter the bios.

    But the thinkpad has Supervisor Password...
    See more | Go to post

    Leave a comment:

  • juergenb
    started a topic Lenovo Yoga L13 Gen 2 - 20VK
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Lenovo Yoga L13 Gen 2 - 20VK

    Thanks , so far.

    I found some sparetime to check this L13.
    I measured most of the Power Rails and they are fine.

    The L13 starts, the fan spins, the Charge LED lights a few times and a melody can be heard. Next it shut´s off.

    I tried Lenovo PC Diagnostics, but the code is unknown.

    At the Audio Ports, i found some caps, that seem to be shorted to ground.
    But i am not shure if this is a short between Analog and Digitral Ground.

    Can someone liste to the melody and give some advice?

    Happy Eastern

    ...
    See more | Go to post
    Last edited by piernov; 04-08-2023, 06:28 AM.
  • juergenb
    replied to Lenovo Yoga L13 Gen 2 - 20VK Schematics
    in Schematic Requests ONLY!
    Re: Lenovo Yoga L13 Gen 2 - 20VK Schematics

    many thanks for the schematics
    See more | Go to post

    Leave a comment:

  • juergenb
    replied to Lenovo Yoga L13 Gen 2 - 20VK Schematics
    in Schematic Requests ONLY!
    Re: Lenovo Yoga L13 Gen 2 - 20VK Schematics

    even if i'm embarrassed,
    what does the abbreviation Wkrp stand for?
    See more | Go to post

    Leave a comment:

  • juergenb
    replied to ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?

    Hi,
    i had a few days, playing with this laptop, but i wasn´t able to find anything.
    I think there might be a short at a USB Port (meter goes beep).

    I still have no schematics
    See more | Go to post

    Leave a comment:

  • juergenb
    started a topic Lenovo Yoga L13 Gen 2 - 20VK Schematics
    in Schematic Requests ONLY!

    Lenovo Yoga L13 Gen 2 - 20VK Schematics

    Hello,

    i need Schematics and Boardview for a Thinkpad L13 Gen 2 - 20VH

    Model LAR-2 MB
    Board 19837-1
    MPN 5B20Z48275

    Thank you in advance
    See more | Go to post
  • juergenb
    started a topic ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    ThinkPad L13 Gen 2 i5-1135G - smartbeeps 011000 & shuts down - worth a repair?

    Hi,

    i have a Thinkpad L13 Gen 2 20VH that doesn´t start.

    With powersupply it starts for a few seconds and shut off.
    The same with battery only.

    The keyboard lights up, ESC + F1 + F4 + CapsLock is lit and it plays some smartbeeps (011000). I used an Android Emulator with Lenovo PC Diagnostics, but the smartbeeps code is not available.

    After the smartbeep played, the ESC is lit for a second and the thinkpad shutsdown.

    USB-C Tester show 19.5V and no current.

    I wanted an L13 with an i7, but the seller send me a i5...
    See more | Go to post
    Last edited by juergenb; 08-17-2022, 09:58 AM.
  • juergenb
    replied to Dell Inspiron 5520 LA-8241P Not working with battery(For freshers only)
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Dell Inspiron 5520 LA-8241P Not working with battery(For freshers only)

    Is there any current sense resistor for the battery faulty?

    I could think a about a faulty one, if the current is to high, the laptop could shut down.
    See more | Go to post

    Leave a comment:

  • juergenb
    started a topic Sophos RED 15W - not booting past SPL
    in Troubleshooting & Designing Networks

    Sophos RED 15W - not booting past SPL

    Hi,

    i have a Sophos RED 15w Firewall Device, that is not booting beyond SPL.
    I only get this boot message.

    [B]NAND boot...
    Second program loader running in sram...
    ************
    [/B]

    With a working RED 15 i get this boot messages

    [B]NAND boot...
    Second program loader running in sram...
    Tertiary program loader running in sram...

    U-Boot 2014.07QorIQ-SDK-V1.7+g659b6a2 (Feb 20 2015 - 11:04:31)
    CPU: P1010E, Version: 2.0, (0x80f90020)
    Core: e500, Version: 5.2, (0x80212152)
    ...
    ...
    See more | Go to post
  • juergenb
    started a topic Thinkpad L480 , Power On ONLY without CMOS Battery
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Thinkpad L480 , Power On ONLY without CMOS Battery

    Hi,

    i have a second L480 that had some Liquid Damage (USB-C and Ports on left). The LCD has Coffee on the left side (barely visible).

    It had some Coffee spilled, the notebook was in a bag, when the thermos leaked.

    The book was fine for a while and still worked, so i used this a reference when measuring voltages.
    The book powered on with Power Button and was fine.

    [B]Next day i wanted to continue to repair, but didn´t realise that i had a short with the meter test leads.[/B]

    Ground from Meter was connected to Board...
    See more | Go to post
    Last edited by juergenb; 04-10-2022, 11:27 AM. Reason: changed title
  • juergenb
    started a topic Thinkpad L480 , Short To Ground, CPU gets Hot
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Thinkpad L480 , Short To Ground, CPU gets Hot

    Hi,

    i would like to hear your thoughts.
    This is my first attempt to repair a broken ThinkPad.

    I got a Thinkpad L480 with no power or any sign of life.
    I checked Memory Module, WiFi Module and Display, all are fine.

    I have Schematics and Board View.

    The L480 has no LED and the fan is not spinning or moving with the USB-C PSU (65W).

    I measured all Coils and all i have is

    +5VALW with 5V
    +3VALW with 0V

    I opened PJ202 and i get +3V at +3VALW.

    So i checked...
    See more | Go to post
  • juergenb
    replied to Lenovo L580 not posting
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Lenovo L580 not posting

    Hi,

    what would be the next step to find Short to Ground at L480?

    I have +5VALW but +3VALW ist 0V.
    I removed PJ202 and get +3VALW at PL201.

    Beyond PJ202 i have a short to Ground (about 0 Ohms with Fluke 179 in Diode Mode)...

    Should i inject 1V 1Amp at PJ202 and see what getting hot?

    The USB-C Port has a very bad connector, i need to wiggle a bit with the Connector ...

    Thanks

    Jürgen
    See more | Go to post

    Leave a comment:

  • juergenb
    replied to Lenovo L580 not posting
    in Troubleshooting Laptops, Tablets, and Mobile Devices
    Re: Lenovo L580 not posting

    Hi,

    maybe these value will help.

    PL201 +3VLX
    PL202 +5VLX
    PL403 +VCC_GT
    PL406 +VCC_Core
    PL411 +VCC_Core
    PL408 +VCC_SA
    PL610 +1VALWP
    PL301 +1.2VP
    U0901.8 +3V_SPI
    U4502.8 VCC_3LD0_PD_SPI

    I have a L480 with no Post, only Power LED/Thinkpad Dot flashing (3 Times) and i try to diagnose this board.

    This board has no +3V_SPI on Bios Chip ... (25Q128JVSIQ_SO8)

    I will check PL201 (open PJ201/PF202) if there is some short to ground
    See more | Go to post

    Leave a comment:

  • juergenb
    started a topic Lenovo Y720 15IKB - ESD Damage any idea?
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Lenovo Y720 15IKB - ESD Damage any idea?

    Hi,

    i might get a faulty Legion Y720 Notebook.
    The Notebook has an ESD Error.

    With external Fan´s the notebook is useable.

    The owner tried to swap HDD vs SSD and had an ESD discharge.

    These are the errors
    [LIST]Both fans are not working[/LIST][LIST]battery doesn´t charge at all, runs from PSU[/LIST][LIST]HDMI output is not ok[/LIST][LIST]keyboard light is missing[/LIST][LIST]no sound from speaker[/LIST][LIST]webcam is off[/LIST]

    Maybe bluetooth is although faulty (not tested)

    Has anyone repaired...
    See more | Go to post
  • juergenb
    started a topic Lenovo Thunderbolt 3 Workstation Dock - TB3 Port on Back fried
    in Troubleshooting Laptops, Tablets, and Mobile Devices

    Lenovo Thunderbolt 3 Workstation Dock - TB3 Port on Back fried

    Hi,

    i have a Thunderbolt 3 Dock (40AN Type), with a non working Thunderbolt 3 Connector on the back.

    The Dock was fine, until i wanted to test a magentic USB-C (TB3 compatible) Adatapter for the connection. After a few plug/unplug test of the magnetic Adapter, the TB3 dock was not responding anymore. It even damaged the TB3 cable (0.7m).

    So the whole dock is not responding at he Backside TB3 connector to a Lenovo Notebook (tested 3 Notebooks with TB3 ports).

    If i plug the notebook on the front TB3 connector to the USB-C (TB3 compatbile)...
    See more | Go to post
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