[TechAssist] Re: Sony kv32s45 blows R607 no power

  • From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 5 Jan 2002 16:57:55 -0500

Yeah that's what I meant, If that ic601 is blowing, I'm pretty certain
you're going to find your duty cycle off, It'll kill it if it's off more
than 1%.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Rochester Electronics" <pasthecash@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, January 05, 2002 9:28 AM
Subject: [TechAssist] Re: Sony kv32s45 blows R607 no power


>
> Thanks damon,
>   I don't have a variac but i just ordered one, ill have it
> on tuesday. When you say q601 do you mean ic601? this set
> does not use the standard q601 and q602 that we are all
> familliar with. Insead it uses an ic  MX0841 for the reg.
> Please advise,
>
> Thanks
> Mike
>
>
>
> --- Damon <DAMON101@xxxxxxxxxxxxxx> wrote:
> >
> > Ok, do you have a Variac?? You'll need it for this.
> > Replace blown parts and
> > install variac - set it to 30 volts ac and turn it on. I
> > suspect that using
> > a scope on the Q601 E-C connection point that you will
> > find the duty cycle
> > (turn-on vs turn-off) to NOT be 50%.
> >
> > Check the resistors connected to the Base pins, diodes
> > @caps too. (Don't
> > have my schematics in front of me). These set the timing
> > of the Ic's duty
> > cycle. Of course you may also have NO oscillation at all
> > and one side of
> > q601 is being turned on all the time, if so then the
> > tuning caps for the
> > Pit, Prt, or Smps xfmr come into question, (Remember, no
> > schems in front of
> > me).
> >
> > But that situation will kill q 601 immediately. Hope this
> > helps.
> >
> > Damon Brunger
> > damon101@xxxxxxxxxxxxxx
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> > ----- Original Message -----
> > From: "Rochester Electronics" <pasthecash@xxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, January 04, 2002 11:56 AM
> > Subject: [TechAssist] Sony kv32s45 blows R607 no power
> >
> >
> > >
> > > Hi guys,
> > > hope someone can help with this one.
> > > Sony KV-32S45, came in for no power up. found open R607
> > on
> > > power supply (G Board) and didn't find anything els
> > > suspect.
> > > but changed the the regulator IC601 and the r607,
> > removed
> > > vdr602 and checked out of circuit it seems to be ok.
> > > Checked the HOT in and out of circuit. checked d603 and
> > > d604. all seems ok.
> > > plug set in and imediatly blows R607. Thought i might
> > have
> > > a bad regulator so i changed it again just because i
> > had
> > > one. same problem.  With the power supply unplugged
> > fron
> > > the rest of the set seems ok however i have no print.
> > From
> > > cn641 all i get is the standby 5v but i bet that it
> > needs a
> > > sygnal from the main board to set one of the relays.
> > Not
> > > sure where to go from here. Heeeelllllpppp...
> > >
> > > TIA
> > >
> > > Mike
> > >
> > > =====
> > >    Mike
> > > Rochester Electronics
> > > 716-663-6870
> > > www.RochesterElectronicsRepair.com
> > >
> > > __________________________________________________
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>
> =====
>    Mike
> Rochester Electronics
> 716-663-6870
> www.RochesterElectronicsRepair.com
>
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