[TechAssist] Re: RCA CTC 169AS, Chopper transistor shorted.FIXED
- From: "tvservice" <tvservice@xxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 9 Jan 2003 08:58:16 -0600
RCA has had a problem with there sets squeeling for years
the only way I have been able to solve (sometimes) is add rtv silicone to
all ferrite beads on the diodes and transistors sometimes wedging toothpicks
under coils and transformers will help.
jsut my input
Robert
tvservice@xxxxxxxxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 09, 2003 3:22 AM
Subject: [TechAssist] Re: RCA CTC 169AS, Chopper transistor shorted.FIXED
>
> Damon, that was my problem--or at least one of my problems. I replaced
> the TEA2261 and got it working. Then I noticed your listing and I
> checked the 47uF cap and its ESR was 22, way too high. When I checked
> all the caps the first time I missed this one because of the poor way
> RCA designs their circuit boards. I thought I had tested it, but I had
> tested the wrong 2 points. Thank you for your input. It saved me a
> premature failure. By the way, why do these older CTC169's squeal when
> they are turned off? Everyone I have repaired does this, but doesn't
> come back for years. Is the squealing "normal"? Thanks again.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Damon
> Sent: Tuesday, January 07, 2003 5:00 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA CTC 169AS, Chopper transistor shorted.
>
>
> That 47uf or 39uf cap between the chopper output and the chopper IC can
> get
> leaky and eat the output. ESR won't show leaky cap either --Replace it.
>
> Damon Brunger
> damon101@xxxxxxxxxxxxxx
> Telrad Electronic Services
> Ft Wayne, IN 46815
>
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, January 07, 2003 3:47 AM
> Subject: [TechAssist] RCA CTC 169AS, Chopper transistor shorted.
>
>
> > Hi fellow techs,
> >
> > Brought in just the dead chassis on this 31" CTC169AS. Found chopper
> > transistor shorted and 5 amp fuse open. All caps in P/S check good
> for
> > ESR. Can the chopper transistor short by itself? I thought that
> dried
> > up caps usually cause the short. Set was on when it went dead. I
> have
> > only had the regulator and caps cause a dead set. I have never had
> the
> > chopper short, so I am unfamiliar with this repair and what could
> cause
> > the short. TIA
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
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