[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 7 Mar 2005 06:48:10 -0500
You see, this is what I really focused in on......
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.
Now, 143V is what I set ALL my 169 chassis to.....your 14.2 is well above 12
V (that's when you need to replace the diode), and your 5V....well it's
5V!!!.
But if you pull out your scope and hang it on the 143V Cap .....you're gonna
see garbage on that cap....noise with DC voltage.
Damon Brunger
Telrad Electronics
Fort Wayne IN
----- 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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