Onkyo TX-SV717Pro will not come out of standby.

[Gary L. Woodruff]

I have a Onkyo TX-SV717Pro that will not come out of standby. PS is
sending 13v out. i have checked the output transistors and they are
good. does anyone know of a common problem for these amps?

Any and all help is greatly appreciated.

Gary

 

[Mark Zacharias]

I have a Onkyo TX-SV717Pro that will not come out of standby. PS is sending
13v out. i have checked the output transistors and they are good. does
anyone know of a common problem for these amps?

Any and all help is greatly appreciated.

Gary

Is it clicking repeatedly?

Mark Z.

 

[Tim Schwartz]

I have a Onkyo TX-SV717Pro that will not come out of standby. PS is
sending 13v out. i have checked the output transistors and they are
good. does anyone know of a common problem for these amps?

Any and all help is greatly appreciated.

Gary

Gary,

I have a recollection of a different model from the same era
(TX-SV414PRO) that had some 1/4 watt fuse resistors that would open.
These were on the main board. Sorry I don't remember the values, but
they were under 100 ohms, and I think it was R921,922,923,924. I'd
always change all four, and upgrade them to half watters.

Again, I'm recalling from a different model so this may not apply.

Regards,
Tim Schwartz
Bristol Electronics

 

[Mark Zacharias]

Gary,

I have a recollection of a different model from the same era (TX-SV414PRO)
that had some 1/4 watt fuse resistors that would open. These were on the
main board. Sorry I don't remember the values, but they were under 100
ohms, and I think it was R921,922,923,924. I'd always change all four,
and upgrade them to half watters.

Again, I'm recalling from a different model so this may not apply.

Regards,
Tim Schwartz
Bristol Electronics

I'm pretty sure it does apply. Very similar inside. These models were real
"cookers". There was a very involved mod which involved actually cutting
away the burned area and adding a daughter board complete with regulators. I
never did this mod myself. These units weren't worth it even back then...

Mark Z.

 

[Gary L. Woodruff]

There is no relays clicking and no burnt components or even darkened
areas on any pcb. Ive got +13v going out from the pc but nothing coming
back on the power line(labeled on ps connector). I found q706 to be bad
and replaced it. I get vdd of 2.34vdc into q701 (microprocessor). I also
see 5vdc from the power switch shorting to gnd when activated. I do not
see anything coming out of the pin labeled power. I am thinking either
the IC should have a greater vdd or the chip is bad?

Thanks for any and all help
Gary

 

[Mark Zacharias]

There is no relays clicking and no burnt components or even darkened areas
on any pcb. Ive got +13v going out from the pc but nothing coming back on
the power line(labeled on ps connector). I found q706 to be bad and
replaced it. I get vdd of 2.34vdc into q701 (microprocessor). I also see
5vdc from the power switch shorting to gnd when activated. I do not see
anything coming out of the pin labeled power. I am thinking either the IC
should have a greater vdd or the chip is bad?

Thanks for any and all help
Gary

I can just about guarantee you've missed a large burned area hiding under
the big white flat cable which goes from the main board up to the front
panel.
In this area are several resistors which have been overheated - any one or
more could be open.
Also there is a common tendency to develop cracks in the board there which
actually damage the foil runs causing (again) open circuits.
In extreme examples a hole may even be burned in the board.

Look under that big white flat wire...

I have a PDF of the TX-SV525 which is very similar in this area if you need
it.

Mark Z.

 

[Gary L. Woodruff]

Mark,
Thanks for the tip. I do see the resistors you are speaking of
r921, r922, r923 all .47 ohm 1/4 watt. All are good as well as the small
rectifier diodes in the same area. There is some slight darkening of the
pc board in this area but it is VERY slight. I do not see any voltage on
the microprocessor pin labeled POWER when the power button is depressed.
This voltage turns on a trans in the power supply feeding ac to the
transformers. Shouldn't I at least see some voltage on this pin of the
microprocessor?

Thanks, Gary

 

[Mark Zacharias]

Mark,
Thanks for the tip. I do see the resistors you are speaking of r921,
r922, r923 all .47 ohm 1/4 watt. All are good as well as the small
rectifier diodes in the same area. There is some slight darkening of the
pc board in this area but it is VERY slight. I do not see any voltage on
the microprocessor pin labeled POWER when the power button is depressed.
This voltage turns on a trans in the power supply feeding ac to the
transformers. Shouldn't I at least see some voltage on this pin of the
microprocessor?

Thanks, Gary

The Power pin runs the speaker relay driver. It's not the B+ power for the
micro.

I'm looking at the 525 schematic, so the notation may be a little different.

Try looking at Q925, your 5.6 volt regulator. Maybe no DC input to it at
all. (cracked circuit board is very common on these - and very hard to see.
You'll need a magnifying glass.)

Mark Z.

 

[Gary L. Woodruff]

The Power pin runs the speaker relay driver. It's not the B+ power for
the micro.

I'm looking at the 525 schematic, so the notation may be a little
different.

Try looking at Q925, your 5.6 volt regulator. Maybe no DC input to it at
all. (cracked circuit board is very common on these - and very hard to
see. You'll need a magnifying glass.)

Mark Z.

Mark, Thanks, I do not get anything at q925. I do not get a relay latch
in the power supply board rly901 that sends 120v ac to the big power
transformer. I believe q922 gets its input v from one of the output
windings from this transformer? A couple of possible clues could be that
if I disconnect the large ribbon cable from the display to the main
board my relays power and I do see 12v out of q925. I did replace q706
on the microprocessor board. I does look like the storage capacitor is
open here also and I have not replaced it. I am assuming that this is
only for memory storage and will only affect memory storage but the unit
still should operate?

Thanks much for your help,

Gary

 

[Mark Zacharias]

Mark, Thanks, I do not get anything at q925. I do not get a relay latch in
the power supply board rly901 that sends 120v ac to the big power
transformer. I believe q922 gets its input v from one of the output
windings from this transformer? A couple of possible clues could be that
if I disconnect the large ribbon cable from the display to the main board
my relays power and I do see 12v out of q925. I did replace q706 on the
microprocessor board. I does look like the storage capacitor is open here
also and I have not replaced it. I am assuming that this is only for
memory storage and will only affect memory storage but the unit still
should operate?

Thanks much for your help,

Gary

Well, the output of Q925 may be getting loaded down, but I rather suspect
R928 which if I read my crummy PDF correctly is 18 ohms at 1 watt and feeds
the input to Q925. Once again don't forget the possibility of a fine crack
in the board. Do continuity checks to confirm the integrity of foil traces.

You can e-mail me direct at:

[email protected]

and reverse the domain to read "sbcglobal"

notice there is an underscore _ between my first ande last name.

Do you have the actual schematic? If not I can probably e-mail it to you.

I don't have an actual PDF of this model but I think I have a hard copy - if
so I can scan a better copy than I'm looking at right now.

Mark Z.