XL7005A vs XL7005

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  • Manuel S.
    Lenovo Yoga 720-15ikb (LA-E552P): DEAD - strange voltage on 5V buck converter
    by Manuel S.
    Hi,

    my Lenovo 720 is dead. :-(
    I guess i have found an issue on the 5V buck converter (**BAC7NH** from Silergy (also called SY8288C 5V)) but i am not completely sure so i want to ask here for some hints.
    Here is a Schematic of the IC: https://prom.ua/p1498216381-sy8288c-...ac-bacxxx.html


    When i attach the supply 19V, i only have 1.8V on the OUT (it should be 5V). The IC is getting hot.
    The EN1 is completely off 0V, EN2 show 1.5V.
    If i inject 5V on the EN1 the OUT goes up to 2.6V (but never reach 5V).
    BS seams SHORT to the OUT....
    03-14-2024, 05:17 PM
  • caspian
    Too much current from a Buck Converter
    by caspian
    Dear members,

    Let us consider the buck-converter circuit of +1.05VS_VCCPP in the PDF. +1.05VS_VCCPP is a 1.05v voltage rail. The schematic says the circuit can provide up to 20A of current. It belongs to a laptop: Lenovo G470. B+ is 19v.
    Now assume we connect +1.05VS_VCCPP to many ICs to provide power for them. The laptop works in a way that mostly less than 20A are drawn from +1.05VS_VCCPP but sometimes the required current exceeds 20A. For example, 25A or 30A.
    PU702 is the controller IC in the buck-converter circuit. It controls the output voltage according to the feedback...
    05-29-2020, 06:41 AM
  • adamski1952
    ps5 shorted after buck converter
    by adamski1952
    Hi.all.
    Working on a PS5 EDM-010 motherboard and i've located a short after the TLV62090RGTR 5v to 3.3v chip directly behind F7002.same chip i think. I've removed the chip thinking that was the problem but the short is still there.I injected 1v at 1 amp on output coil (arrowed in picture) but nothing shows up on my thermal camera. No boardview so I because I dont know which rail it feeds i'm reluctant to up the power injection.I could use some help with this if anone has any ideas. ...
    12-18-2024, 08:25 PM
  • caspian
    Causes of Failure After Buck Converter Repair in Laptop
    by caspian
    Dear members,

    Recently, I watched this nice video:
    www.youtube.com/watch?v=XBAn2Ck8GeE

    I have experienced such a failure many times in laptops.
    He replaced the Mosfets and the controller of a buck-converter in one go. But then after powering the laptop on, the new Mosfets burned again.

    What are the popular causes of the repair failure in this video?

    note: after removing the coil, he measured that the circuit is not shorted after the coil. only the circuit before the coil was shorted.

    Thanks
    03-28-2022, 12:57 PM
  • Geeker007
    Please review my ESP based WLED controller board for WS2815 12V LED Strips - New to electronics.
    by Geeker007
    I'm designing an ESP-based WLED controller board for WS2815 12V LED strips, with a primary focus on energy efficiency.

    To minimize power consumption, my goal is to completely shut down the system when the LED strip is turned off.
    However, the current buck converter powering the ESP module draws about 8 watts even when the LEDs are idle, making it unsuitable for low-power operation.

    I am using below components:
    • Buck Converter: TPS562201 (12V → 5V regulated)
    • Microcontroller: XIAO ESP32-C3 (with built-in USB-C)
    • LED Strip: WS2815 (12V digital LED strip)
    • Switching
    ...
    06-29-2025, 05:20 PM
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