[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 30 Sep 2004 14:08:28 -0400
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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