Viewing 8 posts - 89 through 96 (of 97 total)
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  • #7317
    Amilcare
    Keymaster

    Yes, each station has its own mirror and as you will see I have the possibility to have at least 6 TVs open at the same time, and therefore as many mirrors while the monitors with relative PC are one each 4 TV
    I must honestly say that connecting the TV to the PC is now rare but the support given by the always available schemes is essential. Not so much for warranty repairs that, due to the compensation paid by the parent company, it forces you to replace the board rather than repair it. When for a repair you have to act in the 24 hours for wages that once taxes are removed and spent around a plate of pizza you understand that you cannot waste time studying the scheme if you do not want to work in the garage. This is different for out-of-warranty interventions where the cost of repair is well below the cost of the new board.

    • This reply was modified 1 year, 10 months ago by Amilcare.
    • This reply was modified 1 year, 10 months ago by Amilcare.
    #7321
    Picmicro675
    Moderator

    Yup, says maredentro72, there may be two sides of a circuit to monitor. Especially that many are SMT.
    At the time I was getting back the convenience of having to adjust the contrast for an LCD. I can't quite focus the trimmer and at the same time check if the contrast is what you want.

    #8315
    maredentro72
    Participant

    I have not forgotten about my project, I just have other commitments that have me “distracted” but now I take it by the hand again.
    As Amilcare suggested I made the device “circuit breaker” with light bulb, tonight I double-checked all the assembly and now I've tried to energize.
    And luckily I have the light bulb that saved me from the probable bang! It remained on.
    Nothing done, I unplug everything and restart from 0 to check.

    #8349
    Amilcare
    Keymaster

    Ok now start back from the lamp and check the component in short. Initially you will have a varistor following the L C circuit which filters out the noise, immediately after the diode bridge and the filter capacity. None of these components should cause the bulb to light up for a long time. Do not give up and eventually you get over it. You don't know how many nights I've been on circuits that I couldn't fix. All experience accumulated for subsequent repairs.

    #8574
    maredentro72
    Participant

    I checked and… double-checked and everything seems to be back but this is not a sign of certainty.

    I enclose the drawing of the scheme having perhaps the problem actually lies. I probably made some mistakes in redesigning it.

    SMPS version 27/04/2020

    #8596
    Amilcare
    Keymaster

    Can't put a bigger picture can't read values, if I enlarge it it grains.
    One thing immediately jumped to my eyes, the discharge diodes on the gate of the final. They are not needed. for the rest I await a clearer image

    #8598
    maredentro72
    Participant

    Maybe that's better

    • This reply was modified 1 year, 7 months ago by maredentro72.
    • This reply was modified 1 year, 7 months ago by maredentro72.
    #8602
    Amilcare
    Keymaster

    At the moment I can't get to my notes due to forced isolation but, I made this from which I pulled out the drawing for the article.
    Check with this that it has been working for years and has never bothered

Viewing 8 posts - 89 through 96 (of 97 total)
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