JVC AV32730

C

Charlie East

Guest
Set is dead, no relay click or anything. Have 168 vdc from the rectifier to
the switcher transformer, Dont have a schematic, Could not find standby
volts . Can anyone give me some check points to look at( Where to look for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
 
C926 if the regulator IC is running, otherwise you had better get the manual
and be very thorough on the primary of the PS and feedback circuits.

Leonard

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$zj82vh$6s9$1@newsfeed.niagara.com...
Change the 1000mfd next to big diode
to left of reg heatsink.

kip

--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:sp68c.47253$zP2.4145@bignews5.bellsouth.net...
Set is dead, no relay click or anything. Have 168 vdc from the rectifier
to
the switcher transformer, Dont have a schematic, Could not find standby
volts . Can anyone give me some check points to look at( Where to look
for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
Click to expand...
 
Change the 1000mfd next to big diode
to left of reg heatsink.

kip

--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:sp68c.47253$zP2.4145@bignews5.bellsouth.net...
Set is dead, no relay click or anything. Have 168 vdc from the rectifier
to
the switcher transformer, Dont have a schematic, Could not find standby
volts . Can anyone give me some check points to look at( Where to look for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
Click to expand...
 
Also I don't know if it applies to this particular model, but some JVCs have 2
diodes in series off the horiz output collector to ground. If one of these
shorts it draws down the 130v supply and shuts off all power. For some reason
the horiz output does not short, like other sets that use this design when the
diode shorts.
 
The reg IC STRS5708 is not running. I have 168VDC on the input and nothing
else.. Also there is no large switching transistor in the area of the P/S,
Is the switcher contained in the reg IC? Anyone have a schematic of the P/S
on this model? I sure would appreciate a copy. Sams does not list this
model
Thanks Charlie
ceast@bellsouth.net

"Leonard Caillouet" <no@no.com> wrote in message
news:nj78c.1025$pM1.804@lakeread06...
C926 if the regulator IC is running, otherwise you had better get the
manual
and be very thorough on the primary of the PS and feedback circuits.

Leonard

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$zj82vh$6s9$1@newsfeed.niagara.com...
Change the 1000mfd next to big diode
to left of reg heatsink.

kip

--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:sp68c.47253$zP2.4145@bignews5.bellsouth.net...
Set is dead, no relay click or anything. Have 168 vdc from the
rectifier
to
the switcher transformer, Dont have a schematic, Could not find
standby
volts . Can anyone give me some check points to look at( Where to look
for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
Click to expand...
 
Did you ESR all the filter caps in PS ?

kip
--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:eek:Rs8c.139106$rB4.36387@bignews6.bellsouth.net...
The reg IC STRS5708 is not running. I have 168VDC on the input and
nothing
else.. Also there is no large switching transistor in the area of the P/S,
Is the switcher contained in the reg IC? Anyone have a schematic of the
P/S
on this model? I sure would appreciate a copy. Sams does not list this
model
Thanks Charlie
ceast@bellsouth.net

"Leonard Caillouet" <no@no.com> wrote in message
news:nj78c.1025$pM1.804@lakeread06...
C926 if the regulator IC is running, otherwise you had better get the
manual
and be very thorough on the primary of the PS and feedback circuits.

Leonard

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$zj82vh$6s9$1@newsfeed.niagara.com...
Change the 1000mfd next to big diode
to left of reg heatsink.

kip

--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:sp68c.47253$zP2.4145@bignews5.bellsouth.net...
Set is dead, no relay click or anything. Have 168 vdc from the
rectifier
to
the switcher transformer, Dont have a schematic, Could not find
standby
volts . Can anyone give me some check points to look at( Where to
look
for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
Click to expand...
 
Checked all the caps, replaced a couple that were high esr but still no
help, I think at this point I need the schematic
Charlie

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$b3s4vh$51h$1@newsfeed.niagara.com...
Did you ESR all the filter caps in PS ?

kip
--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:eek:Rs8c.139106$rB4.36387@bignews6.bellsouth.net...
The reg IC STRS5708 is not running. I have 168VDC on the input and
nothing
else.. Also there is no large switching transistor in the area of the
P/S,
Is the switcher contained in the reg IC? Anyone have a schematic of the
P/S
on this model? I sure would appreciate a copy. Sams does not list this
model
Thanks Charlie
ceast@bellsouth.net

"Leonard Caillouet" <no@no.com> wrote in message
news:nj78c.1025$pM1.804@lakeread06...
C926 if the regulator IC is running, otherwise you had better get the
manual
and be very thorough on the primary of the PS and feedback circuits.

Leonard

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$zj82vh$6s9$1@newsfeed.niagara.com...
Change the 1000mfd next to big diode
to left of reg heatsink.

kip

--
"Watch the return E-Mail addy its false"
"Charlie East" <ceast@bellsouth.net> wrote in message
news:sp68c.47253$zP2.4145@bignews5.bellsouth.net...
Set is dead, no relay click or anything. Have 168 vdc from the
rectifier
to
the switcher transformer, Dont have a schematic, Could not find
standby
volts . Can anyone give me some check points to look at( Where to
look
for
the standby volts)
Thanks
Charlie
ceast@bellsouth.net
Click to expand...
 
On Thu, 25 Mar 2004 21:41:41 -0600, "Charlie East"
<ceast@bellsouth.net> wrote:

Checked all the caps, replaced a couple that were high esr but still no
help, I think at this point I need the schematic
Charlie
Click to expand...
Did you keep meter on voltage outputs of this SMPS and watched it
while plugging in? This kind of SMPS using switching STR stuff
voltages tend to spike then fade away if there's a problem ahead of
outputs.

STR IC needs two items, good feedback and supply voltage to start up
and stay running within regulation. Check the resistors, optisolator
and caps are good.
I assume this chassis uses same SMPS for standby and run power.


Cheers,

Wizard
 
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