[TechAssist] Re: RCA G35772AT CTC187CL DEAD/More info
- From: <jhoeme@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 30 Sep 2004 13:27:17 -0500
What is the resistance from pin 6 of U3201 to ground? If you recently did a
resolder in the tuner wrap check for solder bridges. Also check R3204
(100K), C7411 (10pf NPO), C1622 (22pf NPO)
Jerry's TV Service (Since 1978)
840 So. Kansas Ave
Liberal, KS 67901
620-624-4302
jhoeme@xxxxxxxxxxxxx
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 30, 2004 12:21 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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