good source for TV schematic?

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  • the_rem
    Unknown transformer : how to find a good replacement part ?
    by the_rem
    Hello guys,

    I would like a quite old but still good 800 W ATX PSU to be repaired. The problem was an extremely heavy coil whine coming from the small secondary transfomer on the PCB.

    I desoldered it hoping the references on the upper side would allow me to find a adequate replacement part. Sadly the written references drove me nowhere but to the manufacturer (I-MAG). I sent them a message like a bottle in the see asking them to send me a datasheet of the transformer. And... They responded ! I received a kind of datasheet (see attachment) but my competencies do not allow...
    VEF20FB07BW(2025001A)20110927.pdf
    https://drive.google.com
    04-23-2025, 01:48 AM
  • Mark R
    The Overseas Only Kenwood Model KR 790
    by Mark R
    I am Repairing this unit. It had many problems. One major one was the power transformer being about 4-5 volts low on the main B+ line which called for 66.5 Vols after the Main Filter caps but only showing about 62 Volts. Caps and the 5 amp Diode bridge were replaced which helped slightly.

    The other strange problem was the small secondary winding from the PT which supplies 18 Volts AC to the "FM FLUORESCENT DISPLAY" circuit, and the small winding that supplies 8 Volts AC to the push button grain of wheat lamps. Those voltages were down from 18 Volts to 16 volts. Which was...
    09-23-2025, 08:27 PM
  • cappernicus
    Acer Spin 5 - Lenny_ICL (19771-1) -- Dead - PM_SLP_S3# held low
    by cappernicus
    Laptop model: Sp513-54n-74V2


    Testing power rails (separated by chip) reveals:

    19V_DCBATOUT - (active)

    5V_AUX_S5 - (active)
    5V_S5 - (active)

    3D3V_AUX_S5 - (active)
    3D3V_S5 27Ω - (good) - enabled by Nuvoton chip

    1D8V_VCCIN_AUX - (good) - enabled by 1D8V_S5 PG signal -- (dependent on 3D3V_S5)

    1D8V_S5 41Ω - (good) - enabled by 3D3V_S5 PG signal

    1D05V_VNN_BYPASS - (good) - enabled by 1D8V_VCCIN_AUX PG signal...
    09-25-2024, 05:19 PM
  • shelby5041
    clock radio / radio lifespan?
    by shelby5041
    hi
    ive got a modern digital clock radio approx 15yrs old

    my question is how long can a clock radio or a simple radio last ss farcas operating hours?

    since elec components have limited hour lifecspan i would imagine the radio or clock radio would eventually fail.

    the reason i ask is because i have my clock radio on radio function 24/7 for the past 7 years and its still working fine....i leave the radio on ..never turn off past 7years...thats approx 60000 hours

    it uses very little power just a few watts i would imagine that may have something...
    09-14-2024, 03:30 AM
  • TinkerTron
    Schematic vs. Reality: Where Are the Resistors on My Sharp Clock Radio? Model FY-70CH
    by TinkerTron
    Hey everyone,

    I'm currently working on a mid-70s Sharp Electronic Digital Clock Radio, Model FY-70CH. I found the service manual online, printed it out, and have been studying it for a while. My main reasons for tackling this are: (1) I want to learn electronics and figured I'd start with something I had on hand, and (2) I want to fix its issues. Right now, the radio sounds awful, has about 5V DC at the speaker terminals, and the alarm time setting doesn't work. But I'm not asking how to fix these problems.

    Instead, here's what's been bugging me so far:
    The schematic...
    3 Photos
    03-06-2025, 02:03 PM
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