[TechAssist] Re: RCA TV model F32632SB chas. CTC187CN3 HOT runs hot[UPDATE]
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 20 Dec 2003 10:25:28 -0500
Phil, would that be R4402, a 22 Ohm resistor? If so, I tried it and
there was no difference in temperature.
Thanks for the reply.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Philip Bader wrote:
>
> It seems to me there was an issue on those involving a small 1/8 watt
> resistor right under the HOT that went from E to B I think. It would
> change value and alter the bias.
> Kinda late now, but will check for future ref.
> Phil Bader
>
> Gary McCartney wrote:
> >
> > Thanks to all the replies about this CTC187CN3 running hot. I have tried
> > all the parts suggested (except the flyback) with little or no
> > improvement. Because I can't afford any more time, I left the new parts
> > in and installed an extra heatsink above the HOT. Now after 9 hours of
> > running the set, the temperature is now only 36 deg. C. which is 20 deg.
> > cooler than without it. I explained the situation to the customer so
> > they know that a fault could reoccur in the future. They use the set in
> > the bedroom, so maybe it doesn't run many hours anyways.
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
> > Webster TV wrote:
> > >
> > > Gary,
> > >
> > > You've replaced the parts that I usually have luck solving the overheating
> > > problem with, but I did have two other parts written down that could cause
> > > HOT overheating, so I'll give them to you also. C4303 and C4709.
> > >
> > > Dan Webster
> > > Webster's TV
> > > Shullsburg, Wi.
> > > ----- Original Message -----
> > > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Tuesday, December 16, 2003 4:45 PM
> > > Subject: [TechAssist] RCA TV model F32632SB chas. CTC187CN3 HOT runs hot
> > >
> > > > This 32" CTC187CN3 came in with HOT shorted. I replaced with OEM BUH517
> > > > and noticed the HOT heatsink was running at 59 deg. C. (approx. 138 F),
> > > > measured directly on top of the transistor on the heatsink- which I
> > > > believe to be too hot. I remember having a couple of these sets that
> > > > were running cooler than that, maybe 45 deg. C.
> > > >
> > > > I tried another OEM BUH517 - no help
> > > >
> > > > Also replaced the following:
> > > >
> > > > -C4306 .047 250V
> > > > -hor. driver transformer -with new one
> > > > -R4402, 22 ohm
> > > > -R4305 4.7K 3W
> > > > -CR4402
> > > > -CR4403
> > > > -CR4106
> > > > -C4403 0.55uF
> > > > -C4707 .041 400V
> > > > -C4409, 47 uF 35V
> > > > -C4402 .0157 uF
> > > >
> > > > I measure 139.2 V dc on cathode of CR4106 (B+)
> > > > HOT collector waveform is 1100V p-p no distortion noticed
> > > > waveform at base of HOT is 15V p-p and looks ok (manual calls for 12V
> > > > p-p but my scope may be acting up a bit)
> > > >
> > > >
> > > > Thanks for any help.
> > > >
> > > > --
> > > >
> > > >
> > > >
> > > >
> > > > Gary McCartney
> > > >
> > > > McCartney Electronics
> > > > Guelph Ontario Canada
> > > > Est. 1984
> > > > email: gary (at) number63.ca
> > > >
> > > >
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> --
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
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