Question about JVC TH-S5 System

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PSU problem The unit will not swich on, when power is connected to the dvd/tuner unit the switch-mode power supply can be heard cycling on and off at a rate of approx 2 cycles per second. Is this a known fault? If so, is it the psu or something dragging the output from the psu down.

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  • kiz1 Mar 28, 2008

    I have fixed the power supply fault on my th-s5. In case you have a similar problem I changed the main smoothing capacitor 68uf 400volt and the only other electrolytic capacitor in the oscillator section ie. 39uf 25volt Now up and running again.

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The most likely problem is something dragging down the power. There could be a problem within the power supply as well. This is a "switch mode" power supply. That means that if the primary side does not oscillate correctly, you will get this cycling as well. These are hard to diagnose remotely. Typical power problems such as this run about $15 or so for parts plus the local labor rate if it is within the power supply. The parts cost will rise to the $30-$50 range if the output amp section is the problem.
Dan

Posted on Mar 28, 2008

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First of all, thank you for posting your question here at Fixya.

I'm assuming here that your unit is Sharp BD-MPC41U.

The symptoms you've mentioned indicated that the power supply board of your unit gone to protection mode that's why the LED automatically shuts off. It will encountered once the feedback circuitry sensed malfunction and immediately turned off the unit to avoid further damaged.
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Ratings and feedback are highly appreciated.

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