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Jvc th-303 will not turn on! the power light comes on an then you hear a click and there is nothing! what could cause this

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SOURCE: JVC TH-D60- randomly get nothing

Static and scratching sound caused by dirt or dust in the PCB (printed circuit board) and loose or cold solder joint ;.Clean the circuit board with the use of laquer thinner or alcohol ,so static sound will gone.Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....If this solution help you understand the problem :rate as fixya..

Good luck;

Posted on Jul 16, 2008

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You had a post that said you had fixed faulty power relays on DSP-a1 - how do you identify the relays that need cleaning?


That your amp does not go into the second stage of powering up indicates a fault which is causing it to sit in non-active mode. This could be due to blown output audio module or transistors or a fault in the safety circuit itself. It is not a fault the non-technician can repair and it would need to be sent to an authorized workshop.
I have seen situations where users unknowingly leave frayed ends of wire shorting across the speaker output terminals which can lead to this sort of fault. You could check this out also.

Oct 28, 2011 | Yamaha DSP-A1 Receiver

1 Answer

I have an onkyo HT-R560 receiver that won't turn on. the standby light light up and when you hit the power button you can hear a click-like sound but nothing happens. what should i do to fix my...


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the
speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 07, 2011 | Onkyo HTR500 Receiver

2 Answers

Jvc manual for th-g40


Click JVC Support to download required manual.
Thanks.

Aug 27, 2010 | Audio & Video Receivers

1 Answer

'clicking' off a few seconds after turned on


Does the receiver work OK?
These are probably electromechanical switches (called relays) which yamaha uses a lot. They use electricity to connect/disconnect something by magnetic force and this causes the "clicks". It is used for example to connect the speakers to the output of apmlifier only after it has finished initializing to protect both the amp and the speakers.
When I turn on my RX-V465 I hear at least one click, it is probably connecting power to the amp. When turning it on with Radio button on remote I hear 3 clicks over 2-3 seconds.
So these clicks are normal and nothing to worry about. They occur also when you switch to the PURE DIRECT mode.

Feb 27, 2010 | Yamaha RX-V463 Receiver

3 Answers

Won't power up; push power button on, hear click in back left of unti, get nothing on front display and no output from speakers; as if unit trying to operate


Disconnect the speakers and see what happens. Carefully examine the speaker cables for unwanted connections (shorts).
Take a clue from when the power problem appeared. Something was moved and made the buzz a (probable) dead short.

May 16, 2009 | Pioneer VSX-305 Receiver

1 Answer

My JVC RX6000VBK does not get the signal from or to my subwoofer.


i had the same problem a few times, they are pretty picky receivers.
first take a look in your settings and make sure none of your speakers are set on large, if they are they automatically shut off the woofer,
2, try the adjust option and crank the bass and throw on the bass boost
3. manually turn the woofer on through the receiver itself
4. try and turn up the woofer itself if is powered
5. try hooking the woofer up to the secondary speaker jacks by bridging it, (positive on left and negative on right for even power)

if none of these options work then the woofer itself may be defective even though it lights up

Mar 03, 2009 | JVC RX-6000V Receiver

1 Answer

JVC RX-9010VBK receiver - premap section won't turn on normally


It sound like a bad connection. The first thing that I would do is tighten all the ground screws that hold the circiut boards and the heat sink to the chassis. If that doen't fix it, flex the circuit boards slighty to see if the relays chick on and off (disconnect the speakers first). It could be on the input board, on the relays themselves or just about anywhere.

Feb 01, 2009 | JVC RX-9010V Receiver

1 Answer

Hello, I've been having a problem with my JVC RX-D302B 7.1 Receiver. Whenever I try to power it on, the blue power light comes on for a moment, then it clicks off. I'm planning to take it to a repair...


Unit is going into protection mode because the amplifier output stage is shorted. Measure output voltage of the speaker lines coming out of each output channel...front/center/rear...take measurement before the channel speaker line protection relay. If any voltage is present then that is the output channel that is at fault. Replacement parts are available to the consumer through tritronicsinc.com. If you have experience with a volt meter\checking transistors\soldering it is something you can do. If not it should be left to a service shop. Have a great day!!

barneyluc

Oct 01, 2008 | JVC Audio & Video Receivers

1 Answer

JVC TH-D60- randomly get nothing but static from the speakers. literally works fine once, and the next time you turn it on, you hear nothing but static. have disconnected every cable, and no change.


Static and scratching sound caused by dirt or dust in the PCB (printed circuit board) and loose or cold solder joint ;.Clean the circuit board with the use of laquer thinner or alcohol ,so static sound will gone.Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....If this solution help you understand the problem :rate as fixya..

Good luck;

Jul 16, 2008 | JVC Audio & Video Receivers

1 Answer

Unit won't power up completely


The clicks you hear are the relay that completes the circuit for 110V AC to the main power transformer. Mine had the same problem and here's how I've gotten it to work. A lightning strike near our house caused it to fail, and I traced it to the power transformer relay activation circuit. The tuner and amp were fine. I found a bad transistor in the relay circuit, but didn't have a replacement on hand, so I soldered a jumper wire across the relay switch connections on the power transformer circuit board. This connects the 110V AC directly to the power transformer. DC Power to the amp and tuner circuits will still be controlled by the power switch, but the transformer will be supplying all the AC voltages to the main board. If there is a real problem with the circuits that load the transformer or the transformer itself, then the fuse will blow. If the fuse doesn't blow then I suspect the problem is just in the power sequencing circuit itself, that is not needed for operation other than to make the unit "Energy Star Compliant". A lot of electronic items have a transformer that is not switched, and only fused, so that the supplies are available at all times.

Jan 24, 2008 | Audio & Video Receivers

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