[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 7 Mar 2005 18:11:52 -0500
Warren, you need to list FULL chassis number and give full model # there are
way too many variations of the 169 chassis that`s why your schematic shows a
39uf cap
but your C4108 was a 47uf. In standby you should use CR4116`s cathode for
checking regulated B+ and yes it should be around 143 volts. It sounds like
you
have correct standby voltages, there are many other things that can cause a
dead set
the horizontal crystal, the HV splitter, caps off the HOT, shorted audio
board etc. etc.
list the complete model # and complete chassis # and I`ll look up which
"family"
your 169 is, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Warren" <warrenca@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, March 06, 2005 2:15 PM
Subject: [TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
> I would like to know :
> If there is a problem in the horiz section or elsewhere will it cause
> the P.S. to give wrong standby voltages when the set is off
> and won't turn on??.
> I must establish if the problem is in the PS or not.
> When you read the hints on the fishe(RCA) it says that, if you have
> the 5 V standby then the problem is probably elsewhere.
> I have the 5V but the 15V standby is at 14.2 and the 143 is high and my
> meter is having trouble reading the voltage.
> Changed the meter and the same thing.
> 3 Volts also between the cathodes of two diodes at PS (#'s escape me
> right now) is too high .All say that this should be <1V when in standby
> If you read my first posts you will see that I've changed many of the
> usual parts.
> I must establish if the PS should give proper voltages on it's own when
> plugged into the wall and possible problems elsewhere???
> Thanks
> Warren C
>
> Bill Grabowski wrote:
>
> >Is your Horiz output circuit okay. There are 5 shutdown circuits
> >employed on these CTC169's
> >
> >Pete wrote:
> >
> >
> >>I always replace the caps with the same value on the set, The standby B+
> >>must be 138-140V, running voltage 143-145V, .
> >>Remove and clean the running voltage control, inside the black plastic
> >>cover.
> >>check audio output chips removing the plug in the audio board.
> >>Good luck
> >>
> >>pete
> >>
> >>Perdomo TV, Inc. Since 1972
> >>MIami, Fl.
> >>
> >>
> >>From: Warren" <warrenca@xxxxxxxxx>
> >>To: <techassist@xxxxxxxxxxxxx>
> >>Sent: Friday, March 04, 2005 10:47 PM
> >>Subject: [TechAssist] Projo RCA CTC169 Dead with wrong standby voltages
> >>
> >>Hi all!
> >>I will list the work so far:
> >>15 V standby =3D 14.2
> >>5V standby =3D4.9V
> >>Raw B+=3D151V
> >>Regulated B+ is too high I think ...The meter does not like the signal
> >>at TP4101 some times 197V sometimes 1.97V?? Should the Reg B+ be 143V
> >>before turn on????
> >>=A0=A0From cathode of CR4106 to Cathode of CR4101 first I had 2
> >>Volts.... Now
> >>after changing diodes I get 3 volts???
> >>Should be under 1 Volt.
> >>Installed a startup kit from Global Q4101, U4101, C4102, C4118, C4108
> >>(47uf) which also was a 47UF before.
> >>My schematic shows 39uf ?? does this make a difference?? Caps were
> >>installed first with Q4101 , IC =A0 U4101 was installed
> >>afterwards.
> >>Also changed C4104(15uf) with also no change.
> >>I also tried to isolate the H out (curiosity) - no change
> >>I've read many tips but most of these point to the parts that I've
> >>already changed.
> >>Can someone brush up my 169 skills.
> >>What am I missing??
> >>Does anyone have a troubleshooting flow chart for the 169?? This would
> >>help.
> >>BTW when you push the on button you can see the front led give a slight
> >>single blink.
> >>TIA all !
> >>All tips and comments welcome.
> >>------------------------------------------
> >>
>
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