[TechAssist] Re: GE TV 32GT740 CTC203CA9 does flyback need replacing? [FIXED]
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 31 May 2004 15:40:12 -0400
Thanks to the replies I received regarding this.
I replaced the original HOT 2SC5148 (237470, which does not have built
in damper) with original RCA BUH517 (223942). Also replaced power supply
transistors Q14101 with an IRF840 and Q14102 with an MPSA56 surface
mount, plus R14103 43 Ohm resistor and fuse.
I removed L14401 and scraped the leads, retinned and reinstalled.
The set has run great for 12 hours straight with HOT heatsink temp at 46
deg. C and power supply heatsink at 37 deg. C.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Gary McCartney wrote:
>
> 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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