[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 1 Oct 2004 17:02:32 -0400
Larry,
U4102 is the 12V standby regulator 1=19V 2=0V 3=12V Standby
supply..... Q4103 5V regulator standby #1 @ emitter Q4105 5V standby
regulator #2 @ emitter...
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: Friday, October 01, 2004 4:06 PM
Subject: [TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
> Bob, can you tell me if the 12v "A" source to Q4106 is a standby source? I
have
> zero volts on all legs of Q4106 but have 5v on cathode of CR4114. I`m
trying
> to check all connections to pin 6 of the eprom to find out why pin 6 is
zero
> volts
> U7401 needs this 12v line for Vcc, no clock/data at pins 4/5, tia, Larry E
>
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
>
> "Bob@Bobs tv" wrote:
>
> > Larry,
> > I have one here waiting for estimate approval bad fly...... Put
> > back on bench and removed shorted output.......Plugged in and here are
> > voltage readings..
> > At B+ cap 165volts.... From B+cap (ground) To regulator 1=-40V 1=-33V
3/4/5
> > .9V 6=.8V 7=.4 8/9=0V....... U4102 12Vreg to tuner ground 1=15V 2=0v
3=11.9V
> > Q105 5Vreg to tuner ground E=4.7V B=5.4V C=11.9V
> > Maybe this will help...
> > 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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