[TechAssist] Re: GE TV 32GT740 CTC203CA9 does flyback need replacing?

  • From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 21 May 2004 22:37:32 -0400

I had one that the coil lead didn't appear to go far enough into the hole to
get a good solder connection.

Russ Hoyt
Hoyt's TV
Exeter, NH


----- Original Message ----- 
From: "Technotronic Dimensions" <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 21, 2004 2:44 PM
Subject: [TechAssist] Re: GE TV 32GT740 CTC203CA9 does flyback need
replacing?


> Gary:
>
>                 So Far the ones I have done Just Needed the HOT Replaced
and
> the Coil from its base Resoldered. Some say to unsolder the Coil, and
re-Tin
> the Leeds and Clean etc as a precautionary. Theres also cases where some
> small Signal Transistors outputting from the SMPS are recommended to be
> replaced. Locations I do not recall offhand, but I bet someone will Quote
> Winstips in here later. The HOT By the Way, has to have a Built In Damper
> and Bias Resistor From E-B like the original does. 2SC5149 may be
suitable.
> The ones I use are a Fairchild equivalent. So far No problems.
>
> Steve Hearns
> Technotronic Dimensions, NY [USA]
> WWW.TECHNOTRONIC-DIMENSIONS.COM
> 1-877-817-9885 (Voice / Fax Toll Free - US Only)
>
> ----- Original Message ----- 
> From: "Gary McCartney" <gary@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 21, 2004 2:28 PM
> Subject: [TechAssist] GE TV 32GT740 CTC203CA9 does flyback need replacing?
>
>
>
> This is only the 2nd CTC203 I've worked on.
>
> I have this GE TV model 32GT740 chassis CTC203CA9 with shorted HOT Q4401
> and reg. transistor Q4101 and open fuse. Haven't checked resistors yet
> but diodes all check ok. I have tested the flyback with my HR flyback
> tester and it shows a good collector waveform, 39kV output and no
> indication of problems.
>
> I have read tips that suggest the flyback is usually bad if the HOT is
> shorted. Is it a case where it shorts under full load? My HR tester
> hasn't been wrong yet so I'm wondering if it is a given that the flyback
> should be replaced regardless.
>
> What is the part number for this flyback?
>
> Thanks for any help.
> -- 
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
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