[TechAssist] Re: RCA TV model F32632SB chas. CTC187CN3 HOT runs hot[UPDATE]
- From: "Barry Thompson" <barrystv@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 20 Dec 2003 11:34:44 -0500
Gary,are you sure your B+ is not to high?I have had C4123 and R4125 go bad 3
times on that chassis and they always check good. Barry
barrystv@xxxxxxx
Barrys TV
613 224 3406
Ottawa.Canada.
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, December 20, 2003 10:25 AM
Subject: [TechAssist] Re: RCA TV model F32632SB chas. CTC187CN3 HOT runs
hot[UPDATE]
> 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
> > > > >
> > > > >
> > > >
****************************************************************************
> > > > *
> > > > > Lost Password:
> > > > > http://www.tech-assist.org and select "Login Problems?".
> > > > > Email Archives:
> > > > > //www.freelists.org/archives/techassist/
> > > > >
> > > >
> > > >
****************************************************************************
*
> > > > Lost Password:
> > > > http://www.tech-assist.org and select "Login Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > >
> > > --
> > >
> > >
****************************************************************************
*
> > > Lost Password:
> > > http://www.tech-assist.org and select "Login Problems?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> >
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> >
> >
****************************************************************************
*
> > Lost Password:
> > http://www.tech-assist.org and select "Login Problems?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
>
> --
>
>
****************************************************************************
*
> Lost Password:
> http://www.tech-assist.org and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
*****************************************************************************
Lost Password:
http://www.tech-assist.org and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
