Question about Pioneer VSX-818V-K Receiver
As observed by you this seems more related to be thermal issue sometimes circuits have a THERMAL RUNAWAY due to malfunctions thereby pushing the semiconductors/IC's to generate heat and malfunction.
Sometimes the generated heating and cooling over a period of time can damage the board as a case of DRY SOLDERING joints can come up. This can cut away the circuit as the set/component warms up and so could be a reason.
You can use a FREEZE-IT spray to the heating section to instantly cool to return the set to working perfectly thereby confirming this case. If so check for dry joints , attempt only if you are good with soldering dense boards- so as not to bridge connections.
Also check for fault in ventillation and heat sinking.
If none of the above work then the components can be out of value and so reduced on performance. Take consensus and decide.
Posted on Oct 10, 2011
The output stage circuit of your Pioneer should be checked well to detect this fault. As sound output comes right at first, and it goes of intermittently, distorted and interrupted, there must be some overheating components are there in the audio output state of your set. As you know, there is no one sentence answer to any electronic devices' fault, as they are composed of thousands of components together, by soldering technique. Each and every component in it will and should work properly to what it is desigened to, otherwise fault will occur. There is an overheat protection circuit composed with the audio output section of most hi-watts amps. If this circuit has some trouble with it, the output section components will overheat, shutdown, distorted sound and such faults will occur.
It is very easy to repair a 'dead' set, than this type of faulty set. One have to check each and every component and should detect out the faulty component. It is really a very skilled work, and one must have thorough knoledge in electronics and proper measuring equipements to go up. A very high quality digital multimeter is a must to follow this fault. Moreover, a sound knoledge in following the schematic diagram of the set, which will look entirely different to that of the circuit boards inside.
Eventhough, this fault is very simple and no costly components has not burned out till now, I advice you to get this set repaired by any experienced service technician, or by the authorised service center for Pioneer at your town. Never switch ON this set till this fault has been rectified. It may make things more worse. For anyone, whatever experienced he or she may be, will take some time to detect this fault. OK.
Posted on Oct 09, 2011
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Posted on Jan 02, 2017
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