Basics of IGBT Full Bridge Inverters

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  • Ross Kohler
    Diagnosing South Bridge (FH82H370) on Asus H370-Pro Gaming Motherboard
    by Ross Kohler
    Hi,

    I'm learning about motherboard repair and I believe I've traced the issue down for the South Bridge on the particular motherboard I'm working on. My path of concluding that:
    - There's no sign of any attempt to power on when pushing the power button.
    - No PSON signal is reaching the 24-pin ATX connector.
    - The Super IO chip is receiving the PS_SWITCH signal from the power button and is relaying this signal back to the South Bridge.
    - The Super IO is not receiving the S_SLPS#_R signal back from the South Bridge
    - If I pull the Super IO S_SLPS#_R pin...
    04-16-2024, 09:36 AM
  • Roman555
    Asus H77 LGA1155 mainboard stopped working with Ivy Bridge CPUs
    by Roman555
    Bad symptoms when Ivy Bridge CPU (3rd-gen 22nm) is installed:
    • Won't boot OS (just blank screen or stucks at asus logo, monitor is turned on) with hangs at debug (post) code A3;
    • USB stick with MS-DOS can be loaded via F8 boot menu;
    • Other OSes won't load - hangs or goes reboot;
    • Postponed for several seconds reaction to Alt-Ctrl-Del, Reset and Power buttons;
    • An operating system starts loading but won't finish if it's left only 1 CPU core in BIOS settings;
    What I've already done and it hasn't helped:
    • Cleared CMOS many times;
    • Flashed different versions of BIOS in a CH341 programmer;
    • Updated
    ...
    01-18-2024, 06:26 AM
  • mikkele86
    Power amplifier SMPS IGBT keeps blowing - Artcoustic PDA1000
    by mikkele86
    hello.

    I have two power amplifiers, both having their IGBT blown on the PSU.
    The original mounted IGBT where marked with IRGB20B60PD1PbF and the gate driver is a IR2156STRPBF.

    I looked at mouser and digikey and could not find any available IRGB20B60PD1PbF and somehow ended up using a Bourns BIDW20N60T.
    I replaced the gate driver, the gate resistor and both IGBT. But as soon power is turned on, both IGBT shorts out completely (gate, emitter, collector) and the fuse on the AC line gets killed.

    So I though i missed a capacitor or diode. I removed...
    01-06-2024, 06:45 AM
  • Byte_76
    Gainward GTX 295 SLI Bridge
    by Byte_76
    I have a Gainward GTX 295 with two PCB's which has a broken SLI bridge ribbon cable. As a result, the card is entirely useless and I'd really like to fix it if possible.

    I've searched eBay and AlieExpress but haven't been able to find the part.

    I believe this same SLI bridge cable is used on the Nvidia 9800 GX2 and the GTX 295 which both have two PCB's.

    Can anyone help me on where to get a replacement SLI bridge cable please?
    3 Photos
    05-10-2024, 03:07 AM
  • Document Archive
    Design of CCFL Backlight Inverters with Frame & Bar Cores
    by Document Archive
    Design of CCFL Backlight Inverters with Frame & Bar Cores

    Summary

    Portable devices, such as notebook computers and personal digital assistants are developed rapidly nowadays, which places an increasing demand on display technology. The LCD with cold cathode fluorescent back lighting satisfies the requirements on display performance, size and efficiency.

    The backlight inverter plays a crucial role in supplying the power to the lamps of these flat-panel displays.

    The frame and bar ferrite cores, described in this brochure, are especially designed...
    10-07-2024, 04:26 AM
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