[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: Larry E <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 30 Sep 2004 16:47:49 -0400
Bob, removed and replaced, no difference, problem must be with the fact
I don`t have 5v on pin 6 of eprom, THANKS for the call and the tip
on the resistor, I`m sure it will come in handy in the future, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
"Bob@Bobs tv" wrote:
> Larry,
> See my second post..... If I suspect that resistor I just jump a
> 1.5m below the chassis if that's the problem, the set will start up..That
> resistor is the start up bias for the regulator....I have seen a few on the
> RCA's and also on Panasonic's using same regulator...You can remove the
> output transistor while you service the power supply..on the bench... in
> standby at collector pad when in standby if power supply is working you will
> get like 140/145Volts... Also 12V and 5V will be there...Normally if you
> have problem in sweep the (-voltages) won't even be close or 0
> Volts....Remember no bias to the IC no start....RCA calls that the "start"
> resistor..No guaranty, but don't waste a lot of time like I did on THE FIRST
> ONE...
>
> Bob
>
> Bobs TV Worcester, ma
>
> woodman1@xxxxxxxx
>
> Main 508-853-1482
> Fax 508-853-1480
> ----- Original Message -----
> From: "Larry E" <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, September 30, 2004 2:31 PM
> Subject: [TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
>
> > Bob, not sure what your saying, you want me to bridge R4104 with a 1.5
> meg
> > resistor?
> > because pin 4 of the regulator is 0 volts? What is pin 4`s voltage
> supposed to
> > be? Larry E
> >
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> >
> > "Bob@Bobs tv" wrote:
> >
> > > Larry,
> > > Bridge a 1.5m resistor (R4104) so you know for sure...Pin 4
> needs a
> > > + voltage to get the regulator going...
> > > Bob,
> > >
> > > Bobs TV Worcester, ma
> > >
> > > woodman1@xxxxxxxx
> > >
> > > Main 508-853-1482
> > > Fax 508-853-1480
> > > ----- Original Message -----
> > > From: "Larry E" <videotech@xxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, September 30, 2004 1:21 PM
> > > Subject: [TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
> > >
> > > > Hi Guys, replaced the eprom and still have the same problem, zero
> volts on
> > > pin 6,
> > > >
> > > > 4.32 on pin 8&5. Unsoldered pin 54 of U1001 thinking it might have
> been
> > > pulling
> > > > it down, no change, Q4105 is supposed to be the 5v standby source? (no
> > > schematic)
> > > >
> > > > I have ( measured to cold ground) E= 4.77 B= 5.1 C= 11.7 volts.
> Could
> > > the 4.32
> > > >
> > > > be too low on pins 8 & 5 ? I was told pins 5&6 get the 5 volts from
> pin 8
> > > of
> > > > U3201
> > > > so I`m still confused how pin 5 can have 4.32 but pin 6 would be zero
> if
> > > the
> > > > source
> > > > is internally from pin 8 even with a new eprom installed, HELP!!!
> Larry
> > > E
> > > >
> > > > Larry Eastman
> > > > American TV & Electronics
> > > > Crystal River, Fl. 34428
> > > >
> > > > Larry E wrote:
> > > >
> > > > > Hi Guys, this 187CL is stone dead, no click from relay, HOT is good,
> > > > > have 160 v on collector
> > > > > in standby, resoldered H- driver transformer and the coil, C4107 is
> > > > > good, found a bad
> > > > > C4105 10uf @ 200 replaced it with no change, I need to know if the
> > > > > voltages are correct
> > > > > on U4101 as I don`t have the schematic, they are
> > > > > Pin 1= -40
> > > > > 2= -33
> > > > > 4= 0
> > > > > 5= .9
> > > > > 6= .9
> > > > > 7= .4
> > > > > 8&9 = 0
> > > > > 11&12 = 165 thanks in advance, Larry E
> > > > > Larry Eastman
> > > > > American TV & Electronics
> > > > > Crystal River, Fl. 34428
> > > > >
> > > >
> > >
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