VH4 problem...no sound.

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Johnny5

Johnny5

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I've been using a brand new vh4 for two weeks without problem. Today I was using the amp and all was good. I switched it to standby momentarily as you do and turned it off so that I could try a different cab. I switched cabs turned it back on and got nothing. I swapped back the cabs and got nothing. I then swapped the speaker cable... Nothing! I tried a different lead out front, a different guitar, a third cab......nothing!
I dont know what I've done but the heads not putting out any signal. If I crank the volume I get standard amp hiss but no signal in my instrument cable. All valves are glowing, all fuses are intact. What could be going on???
It might also be worth mentioning sometimes when I try to get it to work for 5 mins and give up I flick the amp to standby and get a pop.
I'm well gutted. :aww:

If anyone could shed some light I'd be eternally greatful????
 
Thanks for the reply
Nope, none are lit up. It looks all good. Visibly there's nothing obviously wrong with it.
 
Midi problem? Had the same, needed new chip; built in by Mr Diezel...
 
I dunno. Could it be? I had my Columbus plugged in at the time but tried without it to no avail. Could it be an internal midi fault? Would that kill the audio signal?
 
My amp "freezed" while in the mute mode. And after a few times on/off switching of the amp it seemed to work again; then it happened again.
It was locked in the mute mode. Result: No sound
I have an older VH4S and I know that a number of them needed a new midi-chip... If that's the problem it should be a simple job to solve. Why don't you contact your dealer? (Oh, and simple is relative; check the Diezel site, there you can also find how to do that change.
If you're a noob with electronics (like me...) a tech can do it. Peter Diezel can supply the chip. However, maybe it is something else...
 
Yeh I suppose that's possible. I had just programmed a mute patch on the columbus the day before.
Is there a reset method for MIDI that could unfreeze it, if that's the problem? Would there still be amp hiss at loud volumes if the mute was engaged?
I had to play with a Marshall 2x12 combo at practice tonight. :no: What a piece of ****!!
I need a fix quick. This is doing my head in. :doh:
 
Johnny5":2bmpivqg said:
I've been using a brand new vh4 for two weeks without problem. Today I was using the amp and all was good. I switched it to standby momentarily as you do and turned it off so that I could try a different cab. I switched cabs turned it back on and got nothing. I swapped back the cabs and got nothing. I then swapped the speaker cable... Nothing! I tried a different lead out front, a different guitar, a third cab......nothing!
I dont know what I've done but the heads not putting out any signal. If I crank the volume I get standard amp hiss but no signal in my instrument cable. All valves are glowing, all fuses are intact. What could be going on???
It might also be worth mentioning sometimes when I try to get it to work for 5 mins and give up I flick the amp to standby and get a pop.
I'm well gutted. :aww:

If anyone could shed some light I'd be eternally greatful????
Click to expand...

Please check preamp tubes.
 
Hi Peter,

They were definitely all lit up. I tried every channel and got no sound.
 
Peter Diezel":13ef5lcl said:
Maybe one is not right in the socket or bad.
Click to expand...

Ok. I'll have to double check tomorrow when I go back to my rehearsal space.

Thankyou to everyone for your replies.
 
well the problem remains.
I checked all the tubes. All of them are right in their sockets and glowing brightly.
I've also confirmed its not the mute being frozen. When I engage it, the amp hiss disappears. It could be the input that's gone but I have no idea how to get in there to check it out.
Any other ideas? Otherwise I'm gonna contact the sales rep.
 
if I plug in a guitar and krank the volume to full you can hear the faintest whisper of guitar coming through the cab. Dunno if that helps anyones disgnosis.
 
Plug the axe into the serial return (loop).

Result?
 
I got sound through the serial loop so I guess its the input socket right?
 
Pull V2 (ch4 won't work then) and swap it for V1, then V3 then V4.

Me thinks one of them is simply dead although its heaters are working, you know . . .
 
duesentrieb":3kfh29mr said:
Pull V2 (ch4 won't work then) and swap it for V1, then V3 then V4.

Me thinks one of them is simply dead although its heaters are working, you know . . .
Click to expand...
So...just to get my head around this, if one of the power tubes goes, does that prevent the rest of them from working?
None of the channels are working so does that mean that V1 or V4 is faulty? Or are they in some weird order?
Does my question make any sense?? :confused:
 
Was playing my VH4 at home past week when i noticed my channel 2 wasn't working.
Other channels worked fine although channel 3 & 4 seemed different. There was a slight sound in the distance on channel 2.

So swapped the preamptubes one by one. V3 was the dead one, but it was glowing nicely. Everythings fine now!! :thumbsup:

The VH4 still goes strong if 1, or 2, or 3 powertubes are broke. But your powertubes are fine if you have sound connecting the guitar in the serial effectloop.

Sounds like V1 is dead.
 
Johnny5":7og2vpng said:
duesentrieb":7og2vpng said:
Pull V2 (ch4 won't work then) and swap it for V1, then V3 then V4.

Me thinks one of them is simply dead although its heaters are working, you know . . .
Click to expand...
So...just to get my head around this, if one of the power tubes goes, does that prevent the rest of them from working?
None of the channels are working so does that mean that V1 or V4 is faulty? Or are they in some weird order?
Does my question make any sense?? :confused:
Click to expand...
It not one of the powertubes which is bad, but a preamp tube. V1 = first preamp tube, closest to the input jack
 
I tried swapping V2 for V1. Still got nothing. Tried swapping V3 and V4 also. Still nothing. Unless they've all magically blown at once, it must be something else.
:aww: :aww: :aww:
I'm gonna have to contact my rep.
 
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