42PFL7422D LG Inverter Modification II v1.2

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  • caspian
    What Zener Diodes on a Linear Power Supply
    by caspian
    Dear members,

    I have a linear variable power supply with unknown brand name that I used for voltage injection.
    Then it failed. I discovered that its transistors (Q1 and Q2) are shorted.
    In addition, I discovered that its zener diodes are defective.
    I can replace the burned transistors.
    But I do not know the model of the zener diodes. the model number is not marked on the zener diodes.
    Therefore, I cannot replace the zener diodes.
    I do not want to test the zener diodes in a test circuit to discover their model or value.
    no schematics are available...
    05-26-2025, 12:38 PM
  • japlytic
    DRIVER_PNP_WATCHDOG error re. old drivers in Windows 11 install image
    by japlytic
    In a Beelink GTR mini PC, mine has an Intel AX200NGW WLAN module.

    Tried (only with keyboard/mouse connected):
    • BIOS + database update
    • Using latest Windows 11 image built with official image creation tool
    • Previous setup version for Windows 11 installer
    • Replacing SSD without a slow block (the previous SSD had a slow block with access time > 500 mS)
    • TPM reset (worked to the point where DRIVER_PNP_WATCHDOG error message is displayed briefly after the point of stalling)
    • Disabling power to WLAN and LAN modules in BIOS (Advanced > AMD PBS > PCI Express Configuration)
    ...
    06-19-2025, 04:59 PM
  • Petr0x
    Bosch 12V and 18V chargers modification
    by Petr0x
    Hi, I would like to share with you small modification to your Bosch tool 12V and 18V chargers.

    You can use it for almost all Bosch chargers what I have seen, for example part numbers GAL 18V-20, GAL 18V-40, GAL 1880, GAL 18V-160, AL 1820, AL1115CV, AL1130CV.

    Bosch (today also other brands using the same system like Wurth, Fein) does not care if you destroy your batteries, because they can sell you new ones. So the marketing is telling you only about speed of the charging, so you will not wait for your batteries to charge too long. Me as a customer want the tools and batteries...
    05-24-2024, 01:00 PM
  • nev1001
    What zener diode might fix the sound on Maestro Mayhem gaming chair?
    by nev1001
    Hi, I'm looking for a bit of help trying to fix the audio unit from a Maestro Mayhem 4.1 gaming chair please.

    The chair has a few speakers and vibration motors. All was well, for a while, but now the sound is gone.

    It may be significant that I discovered my son was powering it with a 19V laptop charger when it should run on 12V - it did fully work, for bit.

    I think an issue could be a zener diode (or capacitor) which has shorted out.

    The board's bluetooth input still works, the vibration motors are working, so is the line out socket but not the...
    04-17-2025, 05:09 PM
  • x_orange90_x
    Vizio E55-E1 bad backlights or bad inverter?
    by x_orange90_x
    I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.

    I don't know how exactly to test the inverter itself. Is it...
    01-29-2025, 09:24 PM
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