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Relay clicks, no display only the volume lights

When I turn on the power I hear the relay , it plays normal with no display.The volume control has the red light on.

Pioneer vsx-5700 s

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Hello,
This is a common problem with a few of the Pioneer of that era (VSX-3300, 3700, etc). A secundary power supply line is faulty and it prevents your display from working. It is not an easy DIY, but a local tech should be able to fix. It is not always the same exact cause, as there are a couple transistors, a zener diode and a cap that can fail.
You can continue to use it without any detrimental effects on the unit, and can guess the settings.
Good luck

Posted on Aug 03, 2009

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Posted on Jan 02, 2017

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Find the particular relay you want to test. Depending on the circuit it controls, the relay may be located under the dashboard or inside the engine compartment in a junction block.
Turn the ignition switch to on to energize the particular circuit you are testing, if necessary.
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Probe the wire or wires feeding voltage to the relay with the test light following the same procedure used on the previous step. If the light glows, there is incoming voltage. Otherwise, the relay is not receiving voltage. Check the voltage source.
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