[TechAssist] Re: RCA CTC 169AS, Chopper transistor shorted.FIXED
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 9 Jan 2003 06:56:53 -0500
I sometimes hear a squeak during power-down, I never worry about it. Just
the nature of electronics.
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 09, 2003 4:22 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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