[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: Larry E <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 01 Oct 2004 16:06:39 -0400
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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