Ok I got a weird one.


I ran into a JVC RX-318 that is half dead. when you plug it in, the standby
relay comes on, the main speaker relays will also come on 5 seconds after
the standby relay comes on, does this under normal conditions also.

But the whole front panel is dead, no VFD, no standby LED, nothing.

i see filiments, thats about it. I checked the incomming standby 5V, it is
present.


im at a standstill. any ideas? bad micro?

here is the funny thing.


If i take and wet my finger a little bit, and touch underneith the crystal,
sometimes the front pannel will spring back to life, and shortly after it
will "lock up" and go dead again. sometimes it dont work at all.


i changed the crystal, didnt resolve it. resoldered the entire area. im at a
standstill. any ideas? its like the clockpulse just doesnt want to start.



"Mike" wrote in message
.. .
Ok I got a weird one.


I ran into a JVC RX-318 that is half dead. when you plug it in, the
standby relay comes on, the main speaker relays will also come on 5
seconds after the standby relay comes on, does this under normal
conditions also.

But the whole front panel is dead, no VFD, no standby LED, nothing.

i see filiments, thats about it. I checked the incomming standby 5V, it is
present.


im at a standstill. any ideas? bad micro?

Mike wrote:
here is the funny thing.


If i take and wet my finger a little bit, and touch underneith the
crystal, sometimes the front pannel will spring back to life, and
shortly after it will "lock up" and go dead again. sometimes it dont
work at all.

i changed the crystal, didnt resolve it. resoldered the entire area.
im at a standstill. any ideas? its like the clockpulse just doesnt
want to start.


"Mike" wrote in message
.. .
Ok I got a weird one.


I ran into a JVC RX-318 that is half dead. when you plug it in, the
standby relay comes on, the main speaker relays will also come on 5
seconds after the standby relay comes on, does this under normal
conditions also.

But the whole front panel is dead, no VFD, no standby LED, nothing.

i see filiments, thats about it. I checked the incomming standby 5V,
it is present.


im at a standstill. any ideas? bad micro?

There could be some contamination in the area, a small cap could be leaky, a
reset line being pulled down, 5 volt line being just a "bit" low, who knows?
Sounds like a fun one all right. A service manual and some experience with
problems like this would be good...

Mark Z.

On Sat, 25 Nov 2006 04:54:43 GMT, "Mike" wrote:

Ok I got a weird one.


I ran into a JVC RX-318 that is half dead. when you plug it in, the standby
relay comes on, the main speaker relays will also come on 5 seconds after
the standby relay comes on, does this under normal conditions also.

But the whole front panel is dead, no VFD, no standby LED, nothing.

i see filiments, thats about it. I checked the incomming standby 5V, it is
present.


im at a standstill. any ideas? bad micro?

I would check for high esr capacitors in the power supply. I had a
Nak receiver with the same symptom and it was caused by a faulty
electrolytic. Chuck