[TechAssist] Re: [TV] CTC169 - Dead - FIXED
- From: "Damon" <DamonEB@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 11 Jan 2007 20:11:22 -0500
Actually the 39uf cap is the one that WHACKS the chopper transistor....gets
leaky, adds DC to the AC signal and just turns that chopper on harder until
it dies a day later....
The 2.2 uf, when it dries out causes the standby 143 to rise as high as 170V
dc....
Now there's one other that can mess with you.....It's the 180uf B+ cap on
the secondary....I've had 2 or 3 that when they go bad, it won't startup,
and measuring the 143V supply in standby you will see it sitting at 143,
then it drifts up to 152, then down, then up to 170, then down and it sticks
at one voltage for a bit....that's because you get HASH on the DC voltage
and it fools your meter...but not a scope....
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, January 11, 2007 4:42 PM
Subject: [TechAssist] Re: [TV] CTC169 - Dead - FIXED
>
> Peggs,
>
> I do own a ESR meter and it found several bad capacitors around U4104
> (TEA2261). I replaced 2.2uf/100v, 15uf/50v, 39uf/50v and 470uf/50v; this
> brought the TV back to life. I'm lucky because I'm told a stressed
> 2.2uf/100v cap can take out the chopper transistor and TEA2261 IC.
> Thanks to all who responded, you know who you are.
>
> David Lessard
> Mr_fixit@xxxxxxxxxxxx
> Alexandria, Ontario, Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of peggs
> Sent: Thursday, January 11, 2007 10:32 AM
> To: techassist@xxxxxxxxxxxxx; tv@xxxxxxxxxxxxxxx;
> techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: [TV] CTC169 - Dead
>
> If you have an ESR meter(get one if you don't)...........check the Caps
> around the TEA2261
>
> Peggs
>
> At 08:49 AM 1/11/07, David Lessard wrote:
> >Hello Techs,
> >
> >I have a CTC169 that is dead, the SMPS chopper transistor is intact and
> >so is the HOT, I have no voltage at either end of CR4118; I have 15V at
> >U4101 pin 16. I have parts coming in today, all the caps around U4101,
> >NTE580 (CR4118), TEA2261, etc. I want to be sure about what is causing
> >the problem, does anyone have a troubleshooting flow chart on the SMPS
> >or any tips on what I should be looking for.
> >
> >Thanks,
> >
> >David Lessard
> >Mr_fixit@xxxxxxxxxxxx
> >
> >
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