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2006 Sony mini boombox no power

Discussion in 'Troubleshooting and Repair' started by Richard9025, Oct 11, 2017.

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  1. Richard9025

    Richard9025

    205
    7
    May 24, 2016
    Hi ! My friend gave me this radio for repair, it is a Sony CFD-S03CP.
    $_86.JPG
    It was working as a kitchen radio for ~5 years and one week ago it just stopped. The power button does nothing when plugged into the wall socket or on batteries.
    My first guess was the power supply, but I checked the voltages in the power supply and they were all okay, the power is getting in the radio.
    The inside is very clean, no cracked traces or pads, it was sitting all the time, not used like a portable unit. No bulged capacitors or other components that look defective. Now it is all disassembled and I can easily get to a bad component. I have a soldering station and a hot air gun, but I don't have an oscilloscope or other instruments except the multimeter for checking things.
    So, what should I do now, as first steps in repairing this "new" radio?
    Thanks !
    Service manual: http://archivos.diagramas.mx/otros/CFD-S03CP.pdf
    Images coming soon.
     
  2. shrtrnd

    shrtrnd

    3,688
    457
    Jan 15, 2010
    My daughter had me look at one of those. Her problem was the switch assembly itself.
    You might check that, just to be sure it's actually 'switching'.
    Next thing I'd do is what you've probably already done. Look carefully for any physical damage to components.
    Darned plastic parts often break-off. Check to make sure all those doors don't have interlocks that aren't being
    activated by a broken-off (or broken and stuck inside the hole) plastic prong (that might be keeping the box from powering-up).
    Before I went into troubleshooting the electronics, I'd make a quick check of all the push-buttons to make sure they
    actually make electrical contact when depressed, and that one of them isn't stuck, causing the problem.
    I'll mention that being in the kitchen, it's been subjected to humidity. I'd look carefully at all of the electrical contacts just to be sure none of them are corroded from moisture.
    (That oughtta keep you busy for a while, and you may actually find the problem)
     
    Richard9025 likes this.
  3. shrtrnd

    shrtrnd

    3,688
    457
    Jan 15, 2010
    I ASSUME that one of the first things you checked, was the fuse?
     
  4. Richard9025

    Richard9025

    205
    7
    May 24, 2016
    I checked if the power switch works and it surely does (checked with continuity when it's pressed)
    Of course, the fuse isnt blown and I checked the parts and they all look perfect.
    Sorry for the late post.
     
  5. Richard9025

    Richard9025

    205
    7
    May 24, 2016
    Any suggestions? Maybe some voltage checks based on the service manual? Thanks!
     
  6. shrtrnd

    shrtrnd

    3,688
    457
    Jan 15, 2010
    It sounds like you probably already have, but with the unit disassembled, I'd just carefully visually inspect the electronics to try to determine any components or circuit trace that may have burned open-circuit.
    Frankly, the 'voltage checks' you asked about seem pretty obvious to me.
    Start at the input power, through the power on-off switch, and keep tracing that power input path until it stops.
    That's where your power interrupt is happening.
     
  7. Richard9025

    Richard9025

    205
    7
    May 24, 2016
    Found the problem, a jumper was poorly connected, reconnected it and now it works flawlessly
     
  8. shrtrnd

    shrtrnd

    3,688
    457
    Jan 15, 2010
    Congratulations. I'm sure the owner will be pleased that you could help them with this.
    Something to bear in mind when you offer to help somebody out with repairs; they often won't admit when they
    made some mistake. (Not saying this was the case here). I just wanted you aware of the fact that my experience is that somebody accidentally drops the electronics, or spills some liquid on it, and won't tell you that when they ask you to look at their problem. When I get something somebody asks me to check, I almost always open it up, just to look for obvious problems before I try to turn it on. Good luck with any future repairs you try, almost nobody anymore has simple common sense troubleshooting skills when it comes to trying to fix their own equipment.
     
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