Optiquest Q241WB one of the worst

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  • harp
    Metod for removing glued heatsink from fragile component
    by harp
    I have peltir element glued to heatsink with something thick and sticky like putty... it cant be separate with force or heat without risk of breaking ceramic or damaged semiconductor layers due to force (eg if try twisted, pulled, lifted)... method that I am using is a single thread for needle (thin and firm thread of pure polyester that cant break with bare hands without glowes), and using it like a saw between heatsink and peltir. I holding a heatsink with knee against table. It slowly cut throug putty and release glued parts. It is slow proces, but preserve undamaged component and heatsink....
    06-23-2025, 02:01 PM
  • dreamlayers
    Weird clipping on Logitech Z-10 speakers
    by dreamlayers
    I bought used Logitech Z-10 computer speakers. They can act as a USB audio device or accept line input, and they have a headphone output jack. Some music didn't sound right, so I played a frequency sweep and heard other frequencies and beat frequencies between them and the sweep. I uploaded a spectrogram of a frequency sweep. From the very start, some but not all odd harmonics are visible, indicating symmetric distortion. Then at higher frequencies there are descending images of those harmonics, indicating non-linearity and constant higher frequency noise mixing with the harmonics. The image of...
    05-22-2025, 11:41 AM
  • nomoresonys
    The worst poorly constructed tvs that are being churned out.
    by nomoresonys
    This topic might save some from buying the worst of the cheap tvs. Have seen plenty, this is the latest one I've had the dis-pleasure to see up close: Hisense 55-Inch Class A6 Series 4K UHD...
    03-03-2024, 07:01 AM
  • angelos
    Sinotec LCD TV Model ST-42KC42F "CCFL lamps not switching on"
    by angelos
    Hi Guys,
    It's been a while that i have been active on the forum, sorry for that. My primary job has been keeping me quite busy.
    The above set starts up with sound working just fine but the CCFL lamps (Inverter) runs for one second and switches off.
    My 24V supply is steady and the ON/OFF pin to the inverter is at +5V.
    The only thing i see is the PWM signal pin is at +5V without any square wave being emitted. Is this normal? as far as i can remember there needs to be a square wave pulse there. Am i right?

    I will now measure with my oscilloscope probe on...
    06-11-2023, 02:14 AM
  • eccerr0r
    line powered filament LED lamps...
    by eccerr0r
    I was playing with one of those "filament" LED lamps. I noticed it seemed to flicker a bit...so I tried powering it with different things to try to extract information about it - noticed it seems to be 100% LED - no droppers, no PSU, no rectifiers, nothing - the LED "filaments" are hooked straight to the contacts!

    Wondering what's the distribution of how "filament" LED lamps are driven? Do any have capacitive droppers? rectifiers? CC PSUs?

    ---

    Found another "filament" LED that does have a PSU in it, seems to be a capacitive...
    09-21-2021, 09:41 AM
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